研究者詳細 - 上野　和英

脱炭素化社会の実現に向けた取り組みにおいて，リチウム系二次電池の重要性は日々高まっている．現状，二次電池の課題として「電池容量の向上」や「充電・放電の高速化」が挙げられる．電解液のイオン輸送特性は，これら課題に深く関与しており，特に電解液中におけるリチウムイオン輸送特性の向上が急務である．従来の理想・希薄溶液論においては，イオンが完全解離し，それぞれが独立に輸送されることが前提とされている．しかし，実際の電解液中ではイオン間及びイオン─溶媒間の相互作用が顕著であり，そのような相互作用を無視した議論ではイオン輸送の詳細な理解には限界がある．したがって，イオン間の相互運動相関を考慮した新たなアプローチが必要不可欠である．本稿では，Onsager輸送係数を用いた濃厚電解液理論により，イオン伝導率・リチウムイオン輸率に代表されるリチウムイオン輸送特性の詳細を解き明かし，イオンダイナミクスの解析に基づいた新規電解液設計の指針を示す．

Conformational Flexibility of Solvent Molecules Enables Li-Ion Hopping in Highly Concentrated Electrolytes

Sawayama, S; Kondou, S; Ueno, K; Fujii, K

JOURNAL OF PHYSICAL CHEMISTRY B 129 ( 31 ) 7995 - 8001 2025年8月

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記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Discrepant lithium transference numbers due to heterogeneous speciation

Philippi, F; Matsuyama, Y; Buyting, S; Sudoh, T; Shigenobu, K; Shinoda, W; Schoenhoff, M; Watanabe, … 全著者表示

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 27 ( 28 ) 15185 - 15195 2025年7月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Weakly coordinating monoether-based concentrated electrolytes: effects of frustrated Li ion coordination on ion transport and Li metal battery performance

Ishikawa, T; Sudoh, T; Shigenobu, K; Wada, G; Tsuzuki, S; Aoki, Y; Sharif, HM; Dokko, K; Watanabe, … 全著者表示

ELECTROCHIMICA ACTA 527 2025年7月 [査読有り]

DOI Web of Science

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

Self-assembled Cationic Surfactant-based Electrolytes for Rechargeable Aqueous Zinc Metal Batteries

SHEN Guohong, KONDOU Shinji, NAKAGAKI Hiroki, WADA Gakuto, WATANABE Masayoshi, DOKKO Kaoru, UENO Ka … 全著者表示

Electrochemistry 93 ( 3 ) 037008 - 037008 2025年3月 [査読有り]

DOI Web of Science CiNii Research

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

Surfactants possess unique properties in bulk solutions and at interfaces, naturally forming self-assembled structures. Herein, cetyltrimethylammonium trifluoroacetate (CTATFA) was incorporated into aqueous electrolytes as a cationic surfactant to enhance their ionic conductivity and electrochemical stability. The presence of CTATFA widened the electrochemical stability windows of both Li-based and Zn-based electrolytes. The Zn-based electrolyte exhibited high ionic conductivity and low viscosity in the bulk solution. In a Zn symmetric cell, the electrolyte containing 1 M Zn(TFA)2-0.5 M CTATFA demonstrated excellent Zn plating/stripping reversibility for over 800 h at 1 mAh cm−2 and 1 mA cm−2. A Zn-Cu cell with 1 M Zn(TFA)2-0.5 M CTATFA exhibited excellent reversibility, achieving over 300 plating/stripping cycles at 5 mA cm−2 and 5 mAh cm−2. The Zn/MnO2 cell using the Zn-based electrolyte also demonstrated a specific capacity of 105 mAh g−1 over 750 cycles at a current density of 0.5 A g−1. This study provides insight into the design of high-performance aqueous electrolytes based on the self-assembly and surface adsorption of cationic surfactants.

Solvation structure of Li+ in highly concentrated LiTFSA–DMSO solutions studied by means of neutron diffraction with 6Li/7Li isotopic substitution method

Kameda, Y; Amo, Y; Usuki, T; Umebayashi, Y; Watanabe, H; Ueno, K; Ikeda, K; Honda, T; Otomo, T

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 98 ( 3 ) 2025年3月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Sulfolane-Based Gel Polymer Electrolytes Enhanced by 2D Boron Nitride Nanosheets for Optimized Ion Dynamics and Stability in Lithium Metal Batteries

Ma, C; Kojitsu, M; Fujimoto, H; Tsuzuki, S; Liu, XZ; Watanabe, M; Ueno, K

ACS APPLIED POLYMER MATERIALS 7 ( 5 ) 3296 - 3308 2025年2月 [査読有り]

DOI Web of Science CiNii Research 学術情報リポジトリ

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 共著

Lithium metal batteries (LMBs) offer tremendous potential due to their high energy density, but practical applications are limited by challenges such as dendrite formation, safety risks, and interfacial instability. This study introduces a composite gel polymer electrolyte (GPE) that systematically integrates sulfolane-based highly concentrated electrolytes (HCEs) with two-dimensional hexagonal boron nitride nanosheets (BNNs). Through advanced experimental characterizations, electrochemical measurements, and theoretical calculations, the composite GPE is shown to achieve enhanced mechanical strength, thermal stability, and superior Li ion transport properties. The incorporation of BNNs not only reinforces the electrolyte matrix but also facilitates selective Li ion transport via strong interactions between Li ions and the filler, as validated by theoretical studies. The optimized composite GPE demonstrates outstanding electrochemical performance, achieving a high ionic conductivity of 0.7 × 10–3 S cm–1 at 30 °C and stable cycling for over 1000 h in Li/Li symmetric cells and more than 300 cycles in Li/LiFePO4 cells, along with excellent rate capabilities. This work provides a comprehensive strategy for addressing the critical limitations of LMBs and establishes a robust framework for developing next-generation high-performance solid-state battery systems.

Interfacially-localized high-concentration electrolytes for high-performance rechargeable aqueous lithium-ion batteries

Guohong Shen, Shinji Kondou, Gakuto Wada, Hiroki Nakagaki, Masayoshi Watanabe, Kaoru Dokko, Kazuhid … 全著者表示

EES Batteries 1 273 - 286 2025年1月 [査読有り] [招待有り]

DOI

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

Localized High-Concentration Binary Salt Electrolytes with Suppressed Li2Sx Solubility to Achieve Stable Li–S Pouch Cells with High Sulfur-Loading Cathodes under Lean Electrolyte Conditions

Liu, JL; Ghosh, A; Kondou, S; Li, SL; Ueno, K; Dokko, K; Watanabe, M

ACS APPLIED ENERGY MATERIALS 8 ( 3 ) 1570 - 1579 2025年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Imidazolium-based Ionic Liquid Electrolytes with Bis(fluorosulfonyl)imide Anions for Lithium Metal Anodes: Effects of Salt Concentration and Solvent Dilution

Murai, J; Ueno, K

ELECTROCHEMISTRY 93 ( 11 ) 117003 - 117003 2025年

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

Ionic liquids (ILs) are attractive electrolytes for Li metal batteries because of their non-volatility, non-flammability, and wide electrochemical stability window. Among them, 1-ethyl-3-methylimidazolium (EMI)-based ILs exhibit high ionic conductivity but suffer from limited reductive stability, and their compatibility with Li metal anodes remains insufficiently explored in the literature. Herein, we report a systematic investigation of binary mixture electrolytes with bis(fluorosulfonyl)imide (FSI) anions, [EMI][FSI]–LiFSI, for Li metal anodes. Increasing the LiFSI concentration improves the Li deposition/dissolution Coulombic efficiency through robust FSI-derived solid electrolyte interphase (SEI) formation and a positive shift in the Li deposition/dissolution potential, which together contribute to the suppression of EMI+ decomposition. Furthermore, solvent dilution reveals contrasting effects: coordinating dimethoxyethane (G1) weakens the Li+–FSI− interactions and reduces the Coulombic efficiency, whereas the non-coordinating hydrofluoroether (HFE) preserves the interfacial stability while lowering the viscosity. These findings establish EMI-based ILs as a promising class of non-flammable electrolytes, providing an optimal design strategy for achieving highly reversible and safe Li metal batteries.

Design of Liquid Electrolytes for Next-Generation Batteries Based on Analysis of Ion Dynamics

Shigenobu, K; Tsuzuki, S; Shinoda, W; Ueno, K

BUNSEKI KAGAKU 74 ( 9 ) 427 - 436 2025年 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

ALL PRINTED LITHIUM ION BATTERY WITH LIQUID METAL PACKAGE

Ozawa, Y; Kuse, D; Funahashi, M; Nagatake, K; Takano, T; Ueno, K; Ota, H

2025 IEEE 38TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS 604 - 606 2025年

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Poly(Ionic Liquid) Electrolytes at an Extreme Salt Concentration for Solid-State Batteries

Kondou, S; Abdullah, M; Popov, I; Martins, ML; O'Dell, LA; Ueda, H; Makhlooghiazad, F; Nakanishi, A … 全著者表示

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 146 ( 48 ) 33169 - 33178 2024年11月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ionic fluids out of equilibrium: electrodeposition, dissolution, electron transfer, driving forces: general discussion

Abbott, AP; Atkin, R; Gomes, MC; Dufrêche, JF; Elgar, CE; Fung, YKC; Goloviznina, K; Grimaud, A; Ha … 全著者表示

FARADAY DISCUSSIONS 253 ( 0 ) 407 - 425 2024年10月

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記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Bubble Printing of Liquid Metal Colloidal Particles for Conductive Patterns

Mukai, M; Kobayashi, T; Sato, M; Asada, J; Ueno, K; Furukawa, T; Maruo, S

NANOMATERIALS 14 ( 20 ) 2024年10月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Impact of Li Ion Transport Properties on Reversibility of Li Metal Electrode in Glyme-Based Electrolytes

Murai, J; Ishikawa, T; Wada, G; Dokko, K; Watanabe, M; Ueno, K

CHEMELECTROCHEM 11 ( 14 ) 2024年7月 [査読有り]

DOI Web of Science 学術情報リポジトリ

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley 共著

Impact of Li Ion Transport Properties on Reversibility of Li Metal Electrode in Glyme-Based Electrolytes

Murai Junichi, Ishikawa Toru, Wada Gakuto, Dokko Kaoru, Watanabe Masayoshi, Ueno Kazuhide

ChemElectroChem Early Access 2024年6月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley 共著

The demand for innovative batteries with high specific energy densities has increased. Li-metal batteries employing Li-metal anodes, regarded as the ultimate anodes with a high theoretical capacity, have been extensively studied over the past few decades. However, the poor reversibility and safety concerns regarding Li-metal anodes remain unresolved. The importance of the electrode/electrolyte interface, especially the solid electrolyte interphase (SEI), for achieving reversibility of Li metal anodes has been extensively studied. Herein, we focused on the impact of the Li ion transport properties in oligoether (glyme)-based electrolytes on the deposition/dissolution efficiency of Li metal anodes. Analysis of the low-frequency impedance spectra of Li-plated Cu/Li cells revealed that the diffusion resistance of Li ions (Rdiffusion) may be a dominant contributor to the internal resistance of the cells employing glyme-based electrolytes. A higher Rdiffusion in poor-mass-transport electrolytes with a lower Li ion transference number resulted in larger polarization during Li deposition/dissolution, leading to more pronounced unfavorable side reactions and lower Coulombic efficiency. Rdiffusion rather than interfacial resistance affected the reversibility of the Li metal anode. Enhancing the Li ion mass transport ability of electrolytes is important for achieving highly reversible charge-discharge performance of Li metal anodes at high current densities.

R2R-Based Continuous Production of Patterned and Multilayered Elastic Substrates with Liquid Metal Wiring for Stretchable Electronics

Kawakami, H; Nagatake, K; Ni, SJ; Nakamura, F; Takano, T; Murakami, K; Ohara, I; Isano, Y; Matsuda, … 全著者表示

ADVANCED MATERIALS TECHNOLOGIES 9 ( 17 ) 2024年6月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Liquid Metal Electrode Ink for Printable Lithium-Ion Batteries

Ozawa, Y; Nishitai, Y; Ochirkhuyag, N; Usami, N; Kanto, M; Ueno, K; Ota, H

ADVANCED ENGINEERING MATERIALS 26 ( 11 ) 2024年6月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Evolving better solvate electrolytes for lithium secondary batteries

Philippi, F; Middendorf, M; Shigenobu, K; Matsuyama, Y; Palumbo, O; Pugh, D; Sudoh, T; Dokko, K; Wa … 全著者表示

CHEMICAL SCIENCE 15 ( 19 ) 7342 - 7358 2024年5月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Linear ether-based highly concentrated electrolytes for Li-sulfur batteries

Ishikawa, T; Haga, S; Shigenobu, K; Sudoh, T; Tsuzuki, S; Shinoda, W; Dokko, K; Watanabe, M; Ueno, K

FARADAY DISCUSSIONS 253 ( 0 ) 385 - 406 2024年3月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Solid–electrolyte interphase formation during Li metal deposition in LiN(SO2F)2-based solvate ionic liquids

Ryoichi Tatara, Kohei Ikeda, Kazuhide Ueno, Masayoshi Watanabe, Kaoru Dokko

Journal of Solid State Electrochemistry 28 ( 12 ) 4483 - 4489 2024年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Enhancing Li–S Battery Performance with Limiting Li[N(SO2F)2] Content in a Sulfolane-Based Sparingly Solvating Electrolyte

Jiali Liu, Shanglin Li, Nao Nomura, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

ACS Applied Materials & Interfaces 16 ( 7 ) 8570 - 8579 2024年2月 [査読有り]

DOI Web of Science PubMed 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 単著

Enhancing Li–S Battery Performance with Limiting Li[N(SO2F)2] Content in a Sulfolane-Based Sparingly Solvating Electrolyte

Liu Jiali, Li Shanglin, Nomura Nao, Ueno Kazuhide, Dokko Kaoru, Watanabe Masayoshi

ACS Applied Materials & Interfaces 16 ( 7 ) 8570 - 8579 2024年2月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 共著

By enhancing the stability of the lithium metal anode and mitigating the formation of lithium dendrites through electrolyte design, it becomes feasible to extend the lifespan of lithium–sulfur (Li–S) batteries. One widely accepted approach involves the utilization of Li[N(SO2F)2] (Li[FSA]), which holds promise in stabilizing the lithium anode by facilitating the formation of an inorganic-dominant solid electrolyte interface (SEI) film. However, the use of Li[FSA] encounters limitations due to inevitable side reactions between lithium polysulfides (LiPSs) and [FSA] anions. In this study, our focus lies in precisely controlling the composition of the SEI film and the morphology of the deposited lithium, as these two critical factors profoundly influence lithium reversibility. Specifically, by subjecting an initial charging process to an elevated temperature, we have achieved a significant enhancement in lithium reversibility. This improvement is accomplished through the employment of a LiPS sparingly solvating electrolyte with a restricted Li[FSA] content. Notably, these optimized conditions have resulted in an enhanced cycling performance in practical Li–S pouch cells. Our findings underscore the potential for improving the cycling performance of Li–S batteries, even when confronted with challenging constraints in electrolyte design.

Influence of Primary Particle Morphology and Hydrophilicity of Carbon Matrix on Electrode Coating Quality and Performance of Practical High-Energy-Density Li–S Batteries

Shanglin Li, Zhaoyue Chen, Kentaro Yamamoto, Toshiki Watanabe, Yoshiharu Uchimoto, Yuki Mori, Gen I … 全著者表示

Advanced Materials Interfaces 11 ( 7 ) 2024年1月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

PRESSURE SENSOR BASED ON AN ORGANIC ELECTROCHEMICAL TRANSISTOR WITH MODULATION OF ELECTRICAL-DOUBLE-LAYER

Inoue, K; Miwa, K; Shimizu, S; Ueno, K; Ohe, J; Ono, S; Ota, H

2024 IEEE 37TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS, MEMS 604 - 605 2024年

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Ion valence-gated photochromism of an aza-crowned diarylethene

Ayaka Takeguchi, Azusa Kikuchi, Kazuhide Ueno, Shinji Ishihara, Aki Nitta, Tetsuya Nakagawa, Takash … 全著者表示

Photochemical & Photobiological Sciences 23 133 - 151 2023年12月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Molecular Level Origin of Ion Dynamics in Highly Concentrated Electrolytes

Keisuke Shigenobu, Seiji Tsuzuki, Seiji Tsuzuki, Frederik Philippi, Taku Sudoh, Yosuke Ugata, Kaoru … 全著者表示

The Journal of Physical Chemistry B 127 ( 48 ) 10422 - 10433 2023年11月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 単著

Single-ion conducting liquid electrolytes are key to achieving rapid charge/discharge in Li secondary batteries. The Li+ transference (or transport) numbers are the defining properties of such electrolytes and have been discussed in the framework of concentrated solution theories. However, the connection between macroscopic transference and microscopic ion dynamics remains unclear. Molecular dynamics simulations were performed to obtain direct information regarding the microscopic behaviors in highly concentrated electrolytes, and the relationships between these behaviors and the transference number were determined under anion-blocking conditions. Various solvents with different donor numbers (DNs) were used along with a Li salt of the weakly Lewis basic bis(fluorosulfonyl)amide anion for electrolyte preparation. Favorable ordered Li+ structuring and a continuous Li+ conduction pathway were observed for the fluoroethylene carbonate-based electrolyte due to its low DN. The properties were less pronounced at higher DNs, e.g., for the dimethyl sulfoxide-based electrolyte. The τLi–solventlife/τdipolerelax ratio was introduced as a factor for ion dynamics, and the two mechanisms of ion transport were considered an exchange mechanism (τLi–solventlife/τdipolerelax < 1) and a vehicle mechanism (translational motion of solvated Li+) (τLi–solventlife/τdipolerelax ≥ 1). Vehicle-type transport was dominant with high DNs, while exchangeable transport was preferable at lower DNs. These findings should aid the further selection of solvents and Li salts to prepare single-ion conducting electrolytes.

High-concentration LiPF6/sulfone electrolytes: structure, transport properties, and battery application

Ugata, Y; Chen, YC; Miyazaki, S; Sasagawa, S; Ueno, K; Watanabe, M; Dokko, K

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 25 ( 43 ) 29566 - 29575 2023年11月

DOI Web of Science PubMed CiNii Research 学術情報リポジトリ

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 共著

Non-flammable and oxidatively stable sulfones are promising electrolyte solvents for thermally stable high-voltage Li batteries. In addition, sulfolane-based high-concentration electrolytes (HCEs) show high Li+ ion transference numbers. However, LiPF6 has not yet been investigated as the main salt in sulfone-based HCEs for Li batteries. In this study, we investigated the phase behaviors, solvate structures, and transport properties of binary and ternary mixtures of LiPF6 and the following sulfone solvents: sulfolane (SL), dimethyl sulfone (DMS), ethyl methyl sulfone (EMS), and 3-methyl sulfolane (MSL). The stable crystalline solvates Li(SL)4PF6 and Li(DMS)2.5PF6 with high melting points were formed in the LiPF6/SL and LiPF6/DMS mixtures, respectively. In contrast, LiPF6/EMS, LiPF6/MSL, and LiPF6/SL/another sulfone mixtures remained liquids over a wide temperature range. Raman spectroscopy revealed that SL and another sulfone are competitively coordinated to Li+ ions to dissociate LiPF6 in the ternary mixtures. Although the ionic conductivity decreased with increasing LiPF6 concentration due to an increase in viscosity, Li+ ions diffused faster than PF6−via exchanging ligands in the HCE [LiPF6]/[SL]/[DMS] = 1/2/2, resulting in a higher Li ion transference number than that in conventional Li battery electrolytes.

Tetra-arm poly(ethylene glycol) gels with highly concentrated sulfolane-based electrolytes exhibiting high Li-ion transference numbers

Tasaki Natsumi, Ugata Yosuke, Hashimoto Kei, Kokubo Hisashi, Ueno Kazuhide, Watanabe Masayoshi, Dok … 全著者表示

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 25 ( 27 ) 17793 - 17797 2023年7月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Molecular Dynamics Simulations of High-Concentration Li[TFSA] Sulfone Solution: Effect of Easy Conformation Change of Sulfolane on Fast Diffusion of Li Ion

Tsuzuki Seiji, Ikeda Shuhei, Shinoda Wataru, Shigenobu Keisuke, Ueno Kazuhide, Dokko Kaoru, Watanab … 全著者表示

JOURNAL OF PHYSICAL CHEMISTRY B 127 ( 28 ) 6333 - 6341 2023年7月 [査読有り]

DOI Web of Science PubMed CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

The parameters of the polarizable force filed used for molecular dynamics simulations of Li diffusion in high-concentration lithium bis(trifluoromethanesulfonyl)amide (Li[TFSA]) sulfone (sulfolane, dimethylsulfone, ethylmethylsulfone and ethyl-ipropylsulfone) solutions were refined. The densities of the solutions obtained by molecular dynamics simulations reproduced well the experimental values. The calculated concentration, temperature and solvent dependencies of self-diffusion coefficients of ions and solvents in the mixtures well reproduce the experimentally observed dependencies. Ab initio calculations show that the intermolecular interactions between Li ion and four sulfones are not largely different. Conformational analyses show that sulfolane can change the conformation more easily owing to lower barrier height for pseudorotation compared to the rotational barrier heights of diethylsulfone and ethylmethylsulfone. Molecular dynamics simulations indicate that the easy conformation change of solvent affects the rotational relaxation of the solvent and the diffusion of Li ion in the mixture. The easy conformation change of sulfolane is one of the causes of faster diffusion of Li ion in the mixture of Li[TFSA] and sulfolane compared to the mixtures of smaller dimethylsulfone and ethylmethylsulfone.

Lithium-Ion Dynamics in Sulfolane-Based Highly Concentrated Electrolytes

Ikeda Shuhei, Tsuzuki Seiji, Sudoh Taku, Shigenobu Keisuke, Ueno Kazuhide, Dokko Kaoru, Watanabe Ma … 全著者表示

JOURNAL OF PHYSICAL CHEMISTRY C 127 ( 28 ) 13837 - 13845 2023年7月 [査読有り]

DOI Web of Science

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）共著

Tetra-arm poly(ethylene glycol) gels with highly concentrated sulfolane-based electrolytes exhibiting high Li-ion transference numbers†

Tasaki Natsumi, Ugata Yosuke, Hashimoto Kei, Kokubo Hisashi, Ueno Kazuhide, Watanabe Masayoshi, Dok … 全著者表示

The Journal of physical chemistry. C 25 ( 27 ) 17793 - 17797 2023年6月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Royal Society of Chemistry 共著

We demonstrate that tetra-arm poly(ethylene glycol) gels containing highly concentrated sulfolane-based electrolytes exhibit high Li+ transference numbers. The low polymer concentration and homogeneous polymer network in the gel electrolyte are useful in achieving both mechanical reliability and high Li+ transport ability.

Li-Ion Transport and Solution Structure in Sulfolane-Based Localized High-Concentration Electrolytes

Sudoh Taku, Ikeda Shuhei, Shigenobu Keisuke, Tsuzuki Seiji, Dokko Kaoru, Watanabe Masayoshi, Shinod … 全著者表示

JOURNAL OF PHYSICAL CHEMISTRY C 127 ( 25 ) 12295 - 12303 2023年6月 [査読有り]

DOI Web of Science 学術情報リポジトリ

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 共著

Imidazolium-Functionalized Anthraquinone for High-Capacity Electrochemical CO2 Capture

Iida Hiroki, Kondou Shinji, Tsuzuki Seiji, Tashiro Mao, Shida Naoki, Motokura Ken, Dokko Kaoru, Wat … 全著者表示

JOURNAL OF PHYSICAL CHEMISTRY C 127 ( 21 ) 10077 - 10086 2023年5月 [査読有り]

DOI Web of Science 学術情報リポジトリ

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 共著

Imidazolium-Functionalized Anthraquinone for High-Capacity Electrochemical CO2 Capture

Kondou Shinji, Tsuzuki Seiji, Tashiro Mao, Motokura Ken, Shida Naoki, Iida Hiroki, Ueno Kazuhide, W … 全著者表示

The Journal of Physical Chemistry C 127 ( 21 ) 2023年5月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society (ACS) 共著

Electrochemical separation methods utilizing quinones as CO2 capture agents have gained considerable interest owing to their low-energy requirements for near-isothermal CO2 separation. However, the low solubility of quinones in nonaqueous solvents limits their total CO2 carrying capacity in the system. In this study, we synthesized an ionically modified anthraquinone, 1-butyl-3-((2′-anthraquinoyl)methyl)imidazolium bis(trifluoromethanesulfonyl)amide ([BAQMIM][TFSA]), which exhibited a 360-fold increase in solubility compared to pristine anthraquinone in dimethyl sulfoxide. The synthesized ionic quinone derivative can also serve as a supporting electrolyte, offering both high ionic conductivity (12.2 mS cm–1) and quinone concentration (200 mM). Constant-potential electrolysis demonstrated a high CO2 carrying capacity in a highly concentrated [BAQMIM][TFSA] solution. The predominantly reversible CO2 capture and subsequent release processes were successfully monitored through in situ spectroscopic analysis and density functional theory calculations. These findings provide a promising approach toward large-scale volumetric CO2 separation through the functionalization of quinones.

Lithium Aluminate Nanoflakes as an Additive to Sulfur Cathodes for Enhanced Mass Transport in High-Energy-Density Lithium-Sulfur Pouch Cells Utilizing Sparingly Solvating Electrolytes

Ghosh Arnab, Liu Jiali, Li Shanglin, Ueno Kazuhide, Dokko Kaoru, Watanabe Masayoshi

ACS APPLIED MATERIALS & INTERFACES 15 ( 19 ) 23104 - 23114 2023年5月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Self-assembling bilayer wiring with highly conductive liquid metal and insulative ion gel layers

Murakami Koki, Isano Yuji, Asada Juri, Usami Natsuka, Isoda Yutaka, Takano Tamami, Matsuda Ryosuke, … 全著者表示

SCIENTIFIC REPORTS 13 ( 1 ) 2023年4月 [査読有り]

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記述言語：英語掲載種別：研究論文（学術雑誌）共著

Distinct Differences in Li-Deposition/Dissolution Reversibility in Sulfolane-Based Electrolytes Depending on Li-Salt Species and Their Solvation Structures

Liu Jiali, Kaneko Tomoaki, Ock Ji-young, Kondou Shinji, Ueno Kazuhide, Dokko Kaoru, Sodeyama Keitar … 全著者表示

JOURNAL OF PHYSICAL CHEMISTRY C 127 ( 12 ) 5689 - 5701 2023年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Phase Behaviors and Ion Transport Properties of LiN(SO2CF3)2/Sulfone Binary Mixtures

TATARA Ryoichi, UGATA Yosuke, MIYAZAKI Shuhei, KISHIDA Natsuki, SASAGAWA Shohei, UENO Kazuhide, TSU … 全著者表示

Electrochemistry 91 ( 3 ) 037008 - 037008 2023年3月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

Highly concentrated Li salt/aprotic solvent solutions are promising electrolytes for next-generation batteries. Understanding the Li+ ion transport process is crucial for designing novel battery electrolytes. In this study, we systematically investigated the phase behavior, solvate structures, and Li+ transport properties of binary mixtures comprising lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and various sulfones, such as sulfolane (SL), 3-methyl sulfolane (MSL), dimethyl sulfone (DMS), ethyl methyl sulfone (EMS), and ethyl isopropyl sulfone (EiPS). Except for the MSL system, the [LiTFSA]/[sulfone] = 1/2 mixtures remained in a liquid state at room temperature, thus enabling a systematic comparison of the Li+ transport properties in the highly concentrated electrolytes. In highly concentrated liquid electrolytes, Li+ ions diffuse by exchanging ligands (sulfone and TFSA). Li+ ions diffuse faster than TFSA in all electrolytes except the EiPS-based electrolyte at a composition of [LiTFSA]/[sulfone] = 1/2, resulting in high Li+ transference numbers. SL-based electrolytes show higher ionic conductivity and Li+ transference numbers than other sulfone-based electrolytes. Consequently, sulfone solvents with compact molecular sizes and low energy barriers of conformational change are favorable for enhancing the Li+ ion transport in the electrolytes.

Anionic Effects on Li-Ion Activity and Li-Ion Intercalation Reaction Kinetics in Highly Concentrated Li Salt/Propylene Carbonate Solutions

Ugata, Y; Tatara, R; Ock, JY; Zhang, JJ; Ueno, K; Watanabe, M; Dokko, K

JOURNAL OF PHYSICAL CHEMISTRY C 127 ( 8 ) 3977 - 3987 2023年3月

DOI Web of Science 学術情報リポジトリ

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

Concentrated Nonaqueous Polyelectrolyte Solutions: High Na-Ion Transference Number and Surface-Tethered Polyanion Layer for Sodium-Metal Batteries

Shinji Kondou, Yusuke Sakashita, Asuka Morinaga, Yu Katayama Yu Katayama, Kaoru Dokko, Masayoshi Wa … 全著者表示

ACS APPLIED MATERIALS & INTERFACES 15 ( 9 ) 11741 - 11755 2023年2月 [査読有り]

DOI Web of Science PubMed

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

Ion Transport in Glyme- and Sulfolane-Based Highly Concentrated Electrolytes

Keisuke Shigenobu, Taku Sudoh, Junichi Murai, Kaoru Dokko, Masayoshi Watanabe, Kazuhide Ueno

THE CHEMICAL RECORD 23 ( 8 ) 2023年2月 [査読有り]

DOI Web of Science PubMed

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

Highly stretchable and sensitive silicone composites with positive piezoconductivity using nickel powder and ionic liquid

R. Matsuda, Y. Isano, K. Ueno, and H. Ota

APL Bioengineering 7 ( 1 ) 2023年2月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

On the concentration polarisation in molten Li salts and borate-based Li ionic liquids

Keisuke Shigenobu, Frederik Philippi, Seiji Tsuzuki, Hisashi Kokubo, Kaoru Dokko, Masayoshi Watanab … 全著者表示

Physical Chemistry Chemical Physics 25 ( 9 ) 6970 - 6978 2023年1月 [査読有り]

DOI Web of Science PubMed CiNii Research

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 単著

Electrolytes that transport only Li ions play a crucial role in improving rapid charge and discharge properties in Li secondary batteries. Single Li-ion conduction can be achieved via liquid materials such as Li ionic liquids containing Li+ as the only cations because solvent-free fused Li salts do not polarise in electrochemical cells, owing to the absence of neutral solvents that allow polarisation in the salt concentration and the inevitably homogeneous density in the cells under anion-blocking conditions. However, we found that borate-based Li ionic liquids induce concentration polarisation in a Li/Li symmetric cell, which results in their transference (transport) numbers under anion-blocking conditions (tabc Li) being well below unity. The electrochemical polarisation of the borate-based Li ionic liquids was attributed to an equilibrium shift caused by exchangeable B-O coordination bonds in the anions to generate Li salts and borate-ester solvents at the electrode/electrolyte interface. By comparing borate-based Li ionic liquids containing different ligands, the B-O bond strength and extent of ligand exchange were found to be directly linked to the tabc Li values. This study confirms that the presence of dynamic exchangeable bonds causes electrochemical polarisation and provides a reference for the rational molecular design of Li ionic liquids aimed at achieving single-ion conducting liquid electrolytes.

Enhancing the reversibility of Li deposition/dissolution in sulfur batteries using high-concentration electrolytes to develop anode-less batteries with lithium sulfide cathode

Hikari Asano, Jiali Liu, Kazuhide Ueno, Kaoru Dokko, Toshikatsu Kojima, Nobuhiko Takeichi, Takuhiro … 全著者表示

Journal of Power Sources 554 ( 15 ) 2023年1月 [査読有り]

DOI Web of Science 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 単著

Does Li-ion transport occur rapidly in localized high-concentration electrolytes?

Yoshifumi Watanabe, Yosuke Ugata, Kazuhide Ueno, Masayoshi Watanabe and Kaoru Dokko

Physical Chemistry Chemical Physics 25 ( 4 ) 3092 - 3099 2022年12月 [査読有り]

DOI Web of Science PubMed 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 単著

Transparent and Breathable Ion Gel-Based Sensors toward Multimodal Sensing Ability

Yuji Isano, Hajime Fujita, Koki Murakami, Sijie Ni, Yuta Kurotaki, Tamami Takano, Yutaka Isoda, Ryo … 全著者表示

ADVANCED MATERIALS TECHNOLOGIES 7 ( 11 ) 2022年11月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Enhancing the reversibility of Li deposition/dissolution in sulfur batteries using high-concentration electrolytes to develop anode-less batteries with lithium sulfide cathode

Asano Hikari, Miyuki Takuhiro, Yamakawa Yukio, Watanabe Masayoshi, Dokko Kaoru, Liu Jiali, Ueno Kaz … 全著者表示

Journal of Power Sources 554 2022年11月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 共著

The reversibility of Li deposition/dissolution onto/from a copper substrate is analyzed herein for fabricating anodeless Li2S-cathode-based batteries using sulfolane (SL)-based sparingly solvating electrolytes to prevent lithium-polysulfide dissolution. The composition of electrolytes-binary lithium bis(trifluoromethanesulfonyl) amide/lithium bis(fluorosulfonyl)amide (LiTFSA/LiFSA; 9:1 molar ratio) in SL solvent-considerably affects the reversibility; a high-concentration electrolyte (HCE) and a localized high-concentration electrolyte (LHCE: HCE diluted by non-coordinating hydrofluoroether) exhibit superior reversibility than that of 1 M solution. Solid electrolyte interphases (SEI) with high F compositions and relatively low O concentrations are formed on the HCE-and LHCE-deposited Li surfaces. SEI formation via FSA decomposition is promoted in the HCE and LHCE, whereas SL decomposition is prohibited by the fluorine-rich SEI. The Li-deposit morphology is significantly affected by the nucleation overpotential at the initial deposition, which is influenced by the nature of the formed SEIs. Small-surface-area deposits with a low nucleation overpotential suppress the electrolyte decomposition and the formation of dead Li, resulting in high reversibility. Optimal reversibility is achieved by performing low -current-density initial deposition at 60 degrees C with the LHCE. The charge/discharge characteristics of anode-less Cu||Li2S batteries are determined under the reversibility-optimized conditions; 75 charge/discharge cycles and a 50-cycle capacity retention rate of 47.5% are achieved.

Temperature Dependency of Ion Transport in Highly Concentrated Li Salt/Sulfolane Electrolyte Solutions

Yosuke Ugata, Gen Hasegawa, Naoaki Kuwata, Kazuhide Ueno, Masayoshi Watanabe, and Kaoru Dokko

THE JOURNAL OF PHYSICAL CHEMISTRY C 126 ( 45 ) 19084 - 19090 2022年11月 [査読有り]

DOI Web of Science 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 単著

Does Li-ion transport occur rapidly in localized high-concentration electrolytes?†

Watanabe Yoshifumi, Ugata Yosuke, Ueno Kazuhide, Masayoshi Watanabe, Kaoru Dokko

Physical Chemistry Chemical Physics 25 ( 4 ) 3092 - 3099 2022年11月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 共著

The ionic conductivity and lithium-ion transference number of electrolytes significantly influence the rate capability of Li-ion batteries. Highly concentrated Li-salt/sulfolane (SL) electrolytes exhibit elevated Li+ transference numbers due to lithium-ion hopping via a ligand exchange mechanism within their –Li+–SL–Li+– network. However, highly concentrated electrolytes (HCEs) are extremely viscous and have an ionic conductivity that is one order of magnitude less than that of conventional electrolytes. Dilution of HCEs with a non-coordinating hydrofluoroether (HFE) lowers the viscosity and produces localized high-concentration electrolytes (LHCE). However, the mechanism of Li+ transport in LHCEs is unclear. This study investigated the transport properties of LHCEs prepared by diluting a SL-based HCE with 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether. Electrolyte viscosity decreases dramatically upon dilution, whereas ionic conductivity increases only slightly. Ion diffusivity increases with increasing HFE content due to the decrease in electrolyte viscosity. However, the Li+ transference number declines, because the HFE interferes with conduction via the Li+ hopping mechanism. The resulting decrease in the product of ionic conductivity and Li+ transference number indicates superior lithium-ion transport in the parent HCE compared with LHCEs.

Concentrated Lithium Dodecyl Sulfate Aqueous Electrolytes: Utilizing Self-Assembly and Interfacial Adsorption for Aqueous Li-ion Batteries

Shinji Kondou, Asuka Morinaga, Dr. Kei Hashimoto, Prof. Yu Katayama, Prof. Kaoru Dokko, Prof. Masay … 全著者表示

ChemElectroChem 9 ( 20 ) e202200870 2022年10月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley-V C H Verlag GmbH 単著

Since aqueous lithium-ion batteries (LIBs) were first proposed, electrolyte design has been intensively studied. We report a simple anionic surfactant, i. e., a lithium dodecyl sulfate (LiDS)-based aqueous electrolyte, capable of enhancing the Li ion transport properties in the bulk and protecting the electrode at the interface. The self-assembly of DS anions into micelles effectively limited anion diffusion, enabling nearly single Li-ion conduction in the bulk electrolyte. The interfacial adsorption of DS molecules formed a hydrophobic layer at the electrolyte/electrode interface under the electric field of the electric double layer, excluding water molecules from the interface. Consequently, the electrochemical window of the aqueous electrolyte was expanded to 3.0 V. This electrolyte improved the cycle performance and rate capability of the LiFePO4/LiTi2(PO4)(3) full-cell compared to a 1.0 mol dm(-3) Li2SO4/H2O reference electrolyte. These results provide a new twist in the design of liquid electrolytes for aqueous LIBs.

Carbonaceous-Material-Induced Gelation of Concentrated Electrolyte Solutions for Application in Lithium–Sulfur Battery Cathodes

Ryo Motoyoshi, Shanglin Li, Seiji Tsuzuki, Arnab Ghosh, Kazuhide Ueno, Kaoru Dokko, and Masayoshi W … 全著者表示

ACS APPLIED MATERIALS & INTERFACES 14 ( 40 ) 45403 - 45413 2022年9月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Stretchable Gas Barrier Films Using Liquid Metal toward a Highly Deformable Battery

Nyamjargal Ochirkhuyag, Yuuki Nishitai, Satoru Mizuguchi, Yuji Isano, Sijie Ni, Koki Murakami, Masa … 全著者表示

ACS APPLIED MATERIALS & INTERFACES 14 ( 42 ) 48123 - 48132 2022年9月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Eutectic Electrolytes Composed of LiN(SO2F)2 and Sulfones for Li-Ion Batteries

Ueno Kazuhide, Nagamine Masayuki, Masayoshi Watanabe, Chen Yichuan, Sasagawa Shohei, Mita Hiroki, S … 全著者表示

Journal of physical chemistry. C 126 ( 24 ) 10024 - 10034 2022年7月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

Sulfones are polar molecules that can be used as thermally stable electrolyte solvents for Li-ion batteries (LIBs). Li salts form stoichiometric solvates with sulfones in the electrolytes. The melting points of the solvates tend to be higher than room temperature, thereby limiting the operating temperature range of the batteries. In this study, the applicability of ternary eutectic mixtures of LiN(SO2F)2 (LiFSA), sulfolane (SL), and dimethyl sulfone (DMS) as LIB electrolytes was assessed. Relative to the binary LiFSA–sulfone electrolytes, the ternary eutectic electrolytes remained liquid over a wide temperature range due to the increased entropy of mixing. Sulfone-bridged Li+–sulfone–Li+ and anion-bridged Li+–FSA––Li+ network structures were formed in the eutectic electrolyte with a composition of [LiFSA]/[SL]/[DMS] = 1/1.5/1.5. Pulsed-field gradient NMR measurements revealed that the Li+ ion dynamically exchanges sulfones and anions and diffuses more rapidly than these ligands, resulting in the relatively high Li+ transference number of the electrolyte. Highly reversible charge–discharge processes of the LiCoO2 and graphite electrodes were attained using the ternary eutectic electrolyte. The rate capability of the Li/LiCoO2 cell in the eutectic electrolyte was comparable to that of the cell in the conventional 1 M LiPF6 in an ethylene carbonate/dimethyl carbonate solution despite its lower ionic conductivity.

イオンゲルとエラストマーナノシートを用いた高通気性透明温度・湿度センサの開発

伊佐野雄司, 藤田創, 上野和英, 藤枝俊宣, 太田裕貴

電気学会論文誌Ｅ（センサ・マイクロマシン部門誌） 142 ( 7 ) 168 - 169 2022年7月 [査読有り]

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人電気学会共著

Temperature sensor and humidity sensor, that are transparent, highly breathable and flexible, were fabricated using elastomer nanosheet and ionic liquid gels with different hydrophilicity. Both sensors showed light transmittance of more than 75% in the visible light range and moisture transmittance 2.8 times higher than transepidermal water loss of human skin. The temperature sensor showed a logarithmic response to temperature, with a sensitivity of 3.2∼2.0%/℃, while humidity sensor showed a linear response to humidity, with a sensitivity of 0.9%/percentage of relative humidity.

Transparent and Breathable Ion Gel-Based Sensors toward Multimodal Sensing Ability

Yuji Isano, Hajime Fujita, Koki Murakami, Sijie Ni, Yuta Kurotaki, Tamami Takano, Yutaka Isoda, Ryo … 全著者表示

Advanced Materials Technologies 2022年6月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Electrochemical Pretreatment of Solid-Electrolyte Interphase Formation for Enhanced Li4Ti5O12 Anode Performance in a Molten Li-Ca Binary Salt Hydrate Electrolyte

Kondou, S; Watanabe, Y; Dokko, K; Watanabe, M; Ueno, K

CHEMELECTROCHEM 9 ( 11 ) 2022年6月

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Eutectic Electrolytes Composed of LiN(SO2F)2 and Sulfones for Li-Ion Batteries

Yosuke Ugata, Yichuan Chen, Shohei Sasagawa, Kazuhide Ueno, Masayoshi Watanabe, Hiroki Mita, Jusuke … 全著者表示

The Journal of Physical Chemistry C 126 ( 24 ) 10024 - 10034 2022年6月 [査読有り]

DOI Web of Science 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 単著

Li+ transference number and dynamic ion correlations in glyme-Li salt solvate ionic liquids diluted with molecular solvents

Taku Sudoh, Keisuke Shigenobu, Kaoru Dokko, Masayoshi Watanabe, Kazuhide Ueno

Physical Chemistry Chemical Physics 24 ( 23 ) 14269 - 14276 2022年5月 [査読有り]

DOI Web of Science PubMed CiNii Research

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 単著

Highly concentrated electrolytes (HCEs) have attracted significant interest as promising liquid electrolytes for next-generation Li secondary batteries, owing to various beneficial properties both in the bulk and at the electrode/electrolyte interface. One particular class of HCEs consists of binary mixtures of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and oligoethers that behave like ionic liquids. [Li(G4)][TFSA], which comprises an equimolar mixture of LiTFSA and tetraglyme (G4), is an example. In our previous works, the addition of low-polarity molecular solvents to [Li(G4)][TFSA] was found to effectively enhance the conductivity while retaining the unique Li-ion solvation structure. However, it remains unclear how the diluents affect another key electrolyte parameter-the Li+ transference number-despite its critical importance for achieving the fast charging/discharging of Li secondary batteries. Thus, in this study, the effects of diluents on the extremely low Li+ transference number under anion-blocking conditions in [Li(G4)][TFSA] were elucidated, with a special focus on the polarity of the additional solvents. The concentration dependence of the dynamic ion correlations was further studied in the framework of the concentrated electrolyte theory. The results revealed that a non-coordinating diluent is not involved in the modification of the ion transport mechanism, and therefore the low Li+ transference number is inherited by the diluted electrolytes. In contrast, a coordinating diluent effectively reduces the anti-correlated ion motions of [Li(G4)][TFSA], thereby improving the Li+ transference number. This is the first time that the significant effects of the coordination properties of the diluting solvents on the dynamic ion correlations and Li+ transference numbers have been reported for diluted solvate ionic liquids.

LiNi0.5Mn1.5O4-Hybridized Gel Polymer Cathode and Gel Polymer Electrolyte Containing a Sulfolane-Based Highly Concentrated Electrolyte for the Fabrication of a 5 V Class of Flexible Lithium Batteries

Binshen Wang , Jiali Liu, Ji-young Ock, Ryo Motoyoshi, Shanglin Li, Kazuhide Ueno, Kaoru Dokko, Sei … 全著者表示

ACS Omega 7 ( 21 ) 17732 - 17740 2022年5月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Li-Ion Transport and Solvation of a Li Salt of Weakly Coordinating Polyanions in Ethylene Carbonate/Dimethyl Carbonate Mixtures

Shinji Kondou, Yusuke Sakashita, Xiaoxiao Yang, Kei Hashimoto, Kaoru Dokko, Masayoshi Watanabe, Kaz … 全著者表示

ACS Applied Materials & Interfaces 14 ( 16 ) 18324 - 18334 2022年4月 [査読有り]

DOI Web of Science PubMed CiNii Research

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 単著

Electrolytes with a high Li-ion transference number (t(Li)) have attracted significant attention for the improvement of the rapid charge-discharge performance of Li-ion batteries (LIBs). Nonaqueous polyelectrolyte solutions exhibit high t(Li) upon immobilization of the anion on a polymer backbone. However, the transport properties and Li-ion solvation in these media are not fully understood. Here, we investigated the Li salt of a weakly coordinating polyanion, poly[(4-styrenesulfonyl)-(trifluoromethanesulfonyl)amide] (poly(LiSTFSA)), in various ethylene carbonate and dimethyl carbonate mixtures. The highest ionic conductivity was unexpectedly observed for the lowest polar mixture at the highest salt concentration despite the low dissociation degree of poly(LiSTFSA). This was attributed to a unique conduction phenomenon resulting from the faster diffusion of transiently solvated Li ions along the interconnected aggregates of polyanion chains. A Li/LiFePO4 cell using such an electrolyte demonstrated improved rate capability. These results provide insights into a design strategy of nonaqueous liquid electrolytes for LIBs.

Electrochemical Pretreatment of Solid-Electrolyte Interphase Formation for Enhanced Li4Ti5O12 Anode Performance in a Molten Li−Ca Binary Salt Hydrate Electrolyte

Shinji Kondou, Yoshifumi Watanabe, Kaoru Dokko, Masayoshi Watanabe, Kazuhide Ueno

ChemElectroChem 9 ( 11 ) e202200061 2022年3月 [査読有り]

DOI Web of Science CiNii Research

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley-V C H Verlag GmbH 単著

Water-in-salt electrolytes have been widely explored because of their expanded electrochemical stability (>3.0 V). However, the instability of solid-electrolyte interphase (SEI) in aqueous electrolytes leads to their reductive decomposition on the negative electrodes of low-potential anode materials. Here, we demonstrate significant improvement in the cycle performance of a Li4Ti5O12 electrode using a Li-Ca binary salt hydrate (LCH) electrolyte in combination with an optimized electrochemical pretreatment process. Compared with a hydrate-melt electrolyte, the LCH electrolyte provided less water-soluble Ca-based SEI components, and careful pretreatment process enabled the formation of a thicker SEI layer on the Li4Ti5O12 electrode. Protected with the hardly soluble, thick SEI layer, the Li4Ti5O12 electrode effectively mitigated unfavorable side reactions and achieved 95.5 % capacity retention over 50 cycles. These results offer insight into a promising route for stable SEI layer formation for the practical use of low-potential anode materials in aqueous rechargeable lithium-ion batteries.

Importance of Mass Transport in High Energy Density Lithium‐Sulfur Batteries Under Lean Electrolyte Conditions

Shanglin Li,Shota Ishikawa, Jiali Liu, Kazuhide Ueno, Kaoru Dokko, Gen Inoue, Masayoshi Watanabe

Batteries & Supercaps 5 ( 5 ) 2022年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Effects of polyimide sequence and monomer structures on CO2 permeation and mechanical properties of sulfonated polyimide/ionic liquid composite membranes

ShogoTachibana, Kei Hashimoto, Haruna Mizuno, Kazuhide Ueno, Masayoshi Watanabe

Polymer 241 124533 2022年2月 [査読有り]

DOI Web of Science 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier Science Ltd. 共著

Local Lithium-Ion Transport of a Ternary Sulfolane-Lithium Bis(trifluoromethanesulfonyl)amide-Carbonate Electrolyte: Experimental and First-Principles Molecular Dynamics Analysis toward Quasi-Solid-State Lithium-Ion Battery

Jun Kawaji, Atsushi Unemoto, Eiji Seki, Motoyuki Hirooka, Tamio Ikeshoji, Kazuhide Ueno, Kaoru Dokk … 全著者表示

Journal of The Electrochemical Society 169 ( 2 ) 020534 2022年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Direct Wiring of Liquid Metal on an Ultrasoft Substrate Using a Polyvinyl Alcohol Lift-off Method

Koki Murakami, Ryota Tochinai, Daiki Tachibana, Yuji Isano, Ryosuke Matsuda, Fumika Nakamura, Yuta … 全著者表示

ACS Applied Materials & Interfaces 14 ( 5 ) 7241 - 7251 2022年1月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Effects of polyimide sequence and monomer structures on CO2 permeation and mechanical properties of sulfonated polyimide/ionic liquid composite membranes

Watanabe Masayoshi, Ueno Kazuhide, Hashimoto Kei, Mizuno Haruna, Tachibana Shogo

POLYMER 241 2022年1月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier Science Ltd. 共著

The effects of polymer structure on CO2 separation and mechanical properties of ion gel membranes composed of ionic liquids (ILs) and sulfonated polyimides (SPIs) were investigated. SPIs with different sequential distributions of ionic groups (multiblock and random) were synthesized. The multiblock copolymer exhibited higher IL uptake (similar to 80 wt.%) than the random copolymer, resulting in higher CO2 permeability (similar to 480 Barrer). The multiblock copolymer exhibited a clearer phase-separated structure than the random copolymer. However, the strain at the break of the multiblock copolymer was lower owing to the brittleness of the non-ionic phase. To improve the mechanical properties, an SPI containing fluorinated groups as a non-ionic part was also synthesized. Compared with the random SPI ion gel membranes, the multiblock SPI ion gel membranes containing fluorinated groups exhibited good CO2 permeability (similar to 500 Barrer) and simultaneously ductile properties with higher strain at the break due to the plasticization of the non-ionic phase, enabling a thin and tough membrane with excellent CO2 separation properties. These results indicate that the polyimide sequence in addition to the chemical structure of monomers affects CO2 permeation and mechanical properties of the sulfonated polyimide/ionic liquid composite membranes.

Ultrafast and Highly Deformable Electromagnetic Hydrogel Actuators Assembled from Liquid Metal Gel Fiber

Daiki Tachibana, Koki Murakami, Takashi Kozaki, Ryosuke Matsuda, Yutaka Isoda, Fumika Nakamura, Yuj … 全著者表示

Advanced Intelligent Systems 4 ( 5 ) 2100212-1 - 2100212-11 2022年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

透明・高通気性イオンゲル超薄膜温湿度センサの開発

伊佐野雄司, 藤田創, 村上航輝, 倪思捷, 黒瀧悠太, 高野珠実, 磯田豊, 松田涼佑, 中村史香, 西躰優希, 井上航太, 川上寛樹, 大久保佑亮, 上野和英, 藤枝 … 全著者表示

生体医工学 Annual60 ( Abstract ) 210_1 - 210_1 2022年

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本生体医工学会共著

次世代のウェアラブルデバイスとして，柔軟性，透明性，気体透過性といった，既存の硬質デバイスでは実現できない特性を持ったデバイスが注目されている．これらのデバイスに用いられるセンサとして，ポリマー薄膜とナノマテリアルを用いた薄膜センサが数多く開発されている．しかし，こうしたセンサに用いられるナノ材料は測定対象の選択性が低く，対象の拡張も難しいという欠点を抱えている．こうした課題を解決できる新たなセンシング材料として，イオン液体が注目されている．イオン液体は常温で液体の塩であり，アニオンとカチオンの組み合わせによって様々な特性を示す．そこで，本研究では親水性の異なる2種のイオン液体とポリマーを組み合わせたイオンゲルをセンシング材料として用いて，透明・高通気性で温湿度の選択的検出が可能な薄膜センサを開発した．センサは生体適合性の高いポリジメチルシロキサン薄膜上に，スプレーコーティングを用いてカーボンナノチューブ電極とイオンゲル感温・感湿部を塗布することで作製した．センサは可視光域で80 %以上の光透過率および人体の経皮水分損失の2.8倍の水蒸気透過量を示した．また，温度と湿度に反応する親水性イオンゲル湿度センサの出力値を温度のみに反応する疎水性イオンゲル温度センサによって校正することで温度と湿度の選択的検出を実現した．今後は，イオン液体とポリマーの変更による薄膜センサの多機能化が期待される．

イオンゲルとポリマー薄膜を用いた透明・高通気性温湿度センサの開発

年次大会 2022 ( 0 ) J221-03 2022年

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本機械学会共著

In this study, a transparent and highly breathable thin-film temperature and humidity sensor was developed as a concept proof for multimodal patchable devices using ion gels. The sensor can detect temperature and humidity selectively by using two types of ionic liquids for sensing layers. Ionic liquids were compatibilized with polymers to form a semi-solid state, called ion gels. Polydimethylsiloxane (PDMS) thin film was used for substrates. Carbon nanotube (CNT) transparent electrodes were fabricated onto PDMS substrate by spray coating method. Ion gel sensing layers were also spray-coated onto CNT electrodes. The fabricated sensor exhibited more than 80 % visible light transmittance and 3.9 times higher water vapor transmission than skin evaporation. LCR meter was used for measuring the impedance of temperature and humidity sensors. As a result, selective detection of temperature and humidity was achieved by using two types of ion gels with different hydrophilicity. These results suggest the easy fabrication of multimodal patchable devices by using various types of ionic liquids.

Effects of Li ion-solvent interaction on ionic transport and electrochemical properties in highly concentrated cyclic carbonate electrolytes

Keisuke Shigenobu, Taku Sudoh, Mayu Tabuchi, Seiji Tsuzuki, Wataru Shinoda, Kaoru Dokko, Masayoshi … 全著者表示

Journal of Non-Crystalline Solids: X 11-12 100071 2021年12月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Liquid Metal–Ionic Liquid Composite Gels for Soft, Mixed Electronic–Ionic Conductors

Juri Asada, Natsuka Usami, Hiroki Ota, Masayoshi Watanabe, Kazuhide Ueno

Macromolecular Chemistry and Physics 223 ( 8 ) 2100319-1 - 2100319-8 2021年11月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Design of Polymer Network and Li+ Solvation Enables Thermally and Oxidatively Stable, Mechanically Reliable, and Highly Conductive Polymer Gel Electrolyte for Lithium Batteries

Kei Hashimoto, Ryoichi Tatara, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Journal of The Electrochemical Society 168 ( 9 ) 2021年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Solvate electrolytes for Li and Na batteries: structures, transport properties, and electrochemistry

Yosuke Ugata, Keisuke Shigenobu, Ryoichi Tatara, Kazuhide Ueno, Masayoshi Watanabe, Kaoru Dokko

Physical chemistry chemical physics 23 ( 38 ) 21419 - 21436 2021年9月 [査読有り]

DOI Web of Science PubMed CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 単著

Polar solvents dissolve Li and Na salts at high concentrations and are used as electrolyte solutions for batteries. The solvents interact strongly with the alkali metal cations to form complexes in the solution. The activity (concentration) of the uncoordinated solvent decreases as the salt concentration is increased. At extremely high salt concentrations, all the solvent molecules are involved in the coordination of the ions and form the solvates of the salts. In this article, we review the structures, transport properties, and electrochemistry of Li/Na salt solvates. In molten solvates, the activity of the uncoordinated solvent is negligible; this is the main origin of their peculiar characteristics, such as high thermal stability, wide electrochemical window, and unique ion transport. In addition, the solvent activity greatly influences the electrochemical reactions in Li/Na batteries. We highlight the attractive features of molten solvates as promising electrolytes for next-generation batteries.

Highly Concentrated NaN(SO2F)2/3-Methylsulfolane Electrolyte Solution Showing High Na-Ion Transference Number under Anion-Blocking Conditions

TATARA Ryoichi, OKAMOTO Yukihiro, UGATA Yosuke, UENO Kazuhide, WATANABE Masayoshi, DOKKO Kaoru

Electrochemistry 89 ( 6 ) 590 - 596 2021年9月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

The performance of a sodium-ion (Na) battery is significantly influenced by its electrolyte characteristics. In particular, the transport properties of the electrolyte have considerable effects on the discharge rate capability. During discharging of a Na battery at high current densities, a concentration gradient of Na salt develops because both cations and anions are mobile in the liquid electrolyte. Concentration polarization can be suppressed by increasing the Na+ transference number (tNa+) of the electrolyte. This study demonstrates that highly concentrated NaN(SO2F)2 dissolved in 3-methylsulfolane (MSL) exhibits a high tNa+ value of >0.6 under anion-blocking conditions. Raman spectroscopy revealed that Na+ ions formed complexes with MSL and anions in the electrolyte. Na+ ions exchange ligands dynamically and move faster than the ligands, resulting in a high tNa+. The high tNa+ enables a high-rate discharge of the Na battery, despite the low ionic conductivity of the highly concentrated electrolyte.

その他リンク： https://ci.nii.ac.jp/naid/130008083685

Electrochemical Properties of Poly(vinylidene fluoride-co-hexafluoropropylene) Gel Electrolytes with High-Concentration Li Salt/Sulfolane for Lithium Batteries

OCK Ji-young, FUJISHIRO Miki, UENO Kazuhide, WATANABE Masayoshi, DOKKO Kaoru

Electrochemistry 89 ( 6 ) 567 - 572 2021年8月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

Combining highly concentrated electrolytes with a polymer network is a valid approach to simultaneously achieve fast Li+ ion transport, high thermal stability, and a wide electrochemical window in a quasi-solid-state form. In this work, flexible gel electrolytes comprising commercially available poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP) and highly concentrated electrolytes of Li salts/sulfolane (SL) were prepared by a simple solution casting method. The anionic effects of the gel electrolytes on the Li-ion conductivity and charge transfer kinetics at the gel/electrode interface were investigated. The SL-based gel electrolyte with lithium bis(fluorosulfonyl)amide (LiFSA) showed an ionic conductivity of 0.7 mS cm−1 and a high Li transference number (>0.5) at 30 °C. The charge transfer resistance in a [Li/gel/LiCoO2] cell with LiFSA was lower than that of the cells with lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) or LiBF4, indicating faster interfacial charge transfer kinetics in the gel electrolyte with FSA. The Li/LiCoO2 cell with the LiFSA/SL gel electrolyte exhibited a higher capacity than that of the cells with the LiTFSA/SL and LiBF4/SL gel electrolytes. Hence, rationally designed gel electrolytes containing highly concentrated SL-based electrolytes enable the high rate performance of Li batteries.

その他リンク： https://ci.nii.ac.jp/naid/130008071030

Protic Ionic Liquids Can Be Both Free Proton Conductors and Benign Superacids

Younes Ansari, Kazuhide Ueno, C. Austen Angell

The Journal of Physical Chemistry B 125 ( 28 ) 7855 - 7862 2021年7月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Local Structure of Li+ in Superconcentrated Aqueous LiTFSA Solutions

Hikari Watanabe, Nana Arai, Erika Nozaki, Jihae Han, Kenta Fujii, Kazutaka Ikeda, Toshiya Otomo, Ka … 全著者表示

The Journal of Physical Chemistry B 125 ( 27 ) 7477 - 7484 2021年7月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Rate Performance of LiCoO2 Half-cells Using Highly Concentrated Lithium Bis(fluorosulfonyl)amide Electrolytes and Their Relevance to Transport Properties

KONDOU Shinji, DOKKO Kaoru, WATANABE Masayoshi, UENO Kazuhide

Electrochemistry 89 ( 4 ) 389 - 394 2021年7月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人　電気化学会共著

For the rapid charge-discharge performance of Li-ion batteries (LIBs), ionic conductivity (σ) and Li ion transference number (t+) are important parameters of electrolytes. Electrolytes with high t+ alleviate the concentration polarization upon fast charge-discharge, and prevent the diffusion-limited mass transfer of Li+ ions. Recent studies have suggested that certain highly concentrated electrolytes exhibit better rate performances than conventional organic electrolytes despite their lower σ. However, the relationship between the transport properties (t+ and σ) of highly concentrated electrolytes and the enhanced rate performance of LIBs is yet to be elucidated. To evaluate the rate performance of LIBs with highly concentrated electrolytes in terms of transport properties, we investigated the discharge rate capability of LiCoO2 (LCO) half-cells using highly concentrated lithium bis(fluorosulfonyl)amide (Li[FSA]) electrolyte in γ-butyrolactone (GBL), acetonitrile (AN), dimethyl carbonate (DMC), and 1,2-dimethoxyethane (DME) solvents. There was a remarkable solvent dependence of t+, and the highest tLi+current of 0.67 was observed for GBL-based electrolyte measured using the very-low-frequency impedance spectroscopy (VLF–IS) method. The LCO half-cell with GBL-based electrolyte delivered higher discharge capacities than the cells with DMC- and DME-based electrolytes at high current densities. The improved rate performance in GBL-based electrolytes was attributable to enhanced Li+ ion mass transfer derived from the high tLi+current. We demonstrated the importance of tLi+current on the rate capability of LCO half-cells with highly concentrated electrolytes for high-rate battery performance.

その他リンク： https://ci.nii.ac.jp/naid/130008062337

Transport Properties of Flexible Composite Electrolytes Composed of Li1.5Al0.5Ti1.5(PO4)3 and a Poly(vinylidene fluoride-co-hexafluoropropylene) Gel Containing a Highly Concentrated Li[N(SO2CF3)2]/Sulfolane Electrolyte

Ji-young Ock, Miki Fujishiro, Kazuhide Ueno, Izuru Kawamura, Ryoichi Tatara, Kei Hashimoto, Masayos … 全著者表示

ACS Omega 6 ( 24 ) 16187 - 16193 2021年6月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Structural Effects of Solvents on Li-Ion-Hopping Conduction in Highly Concentrated LiBF4/Sulfone Solutions

Yosuke Ugata, Shohei Sasagawa, Ryoichi Tatara, Kazuhide Ueno, Masayoshi Watanabe, Kaoru Dokko

The Journal of Physical Chemistry B 125 ( 24 ) 6600 - 6608 2021年6月 [査読有り]

DOI Web of Science PubMed CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

Li-ion-hopping conduction is known to occur in certain highly concentrated electrolytes, and this conduction mode is effective for achieving lithium batteries with high rate capabilities. Herein, we investigated the effects of solvent structure on the hopping conduction of Li ions in highly concentrated LiBF4/sulfone electrolytes. Raman spectroscopy revealed that Li+ ion forms complexes with sulfone and anion, and contact ion pairs and ionic aggregates are formed in the highly concentrated electrolytes. Li+ exchanges ligands (sulfone and BF4 −) rapidly to produce unusual hopping conduction in highly concentrated electrolytes. The structure of the solvent significantly influences the hopping conduction process. We measured the self-diffusion coefficients of Li+ (DLi), anions (Danion), and sulfone solvents (Dsol) in electrolytes. The ratio of the self-diffusion coefficients (DLi/Dsol) tended to be higher for cyclic sulfones (sulfolane and 3-methylsulfolane) than for acyclic sulfones, which suggests that cyclic sulfone molecules facilitate Li-ion-hopping. The hopping conduction increases the Li+ transference number (tLi+ abc) under anion-blocking conditions, and tLi+ abc of [LiBF4]/[cyclic sulfone] = 1/2 is as high as 0.8.

Direct Observation of Photo-Induced Reversible Sol-Gel Transition in Block Copolymer Self-Assembly Containing an Azobenzene Ionic Liquid

Mizuno　Haruna, Hashimoto　Kei, Shigenobu　Keisuke, Kokubo　Hisashi, Ueno　Kazuhide, Watanabe　Masayoshi

Macromolecular rapid communications 42 2100091 2021年5月

DOI 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley 共著

Using atomic force microscopy, the photo-induced reversible changes in a block copolymer self-assembly containing an azobenzene ionic liquid, which undergoes sol–gel transition is directly observed. This is the first report on the sol–gel transition of an ABA-type block copolymer consisting of upper critical solution temperature (UCST)-type A blocks in a photoresponsive ionic liquid mixture. The sol–gel transition is accompanied by an order-to-disorder structural change, which subsequently induces a change in the ionic conductivity. Surprisingly, the photo-induced ionic conductivity and rheological changes occurs rapidly (≈30 s) despite the dense (≈80 wt%) polymeric system. The rapid structural change is probably attributable to the fast diffusion of the ionic liquid.

Direct Observation of Photo‐Induced Reversible Sol–Gel Transition in Block Copolymer Self‐Assembly Containing an Azobenzene Ionic Liquid

Haruna Mizuno, Kei Hashimoto, Keisuke Shigenobu, Hisashi Kokubo, Kazuhide Ueno, Masayoshi Watanabe

Macromolecular Rapid Communications 42 ( 10 ) 210009-1 - 210009-5 2021年5月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Thermodynamic aspect of sulfur, polysulfide anion and lithium polysulfide: Plausible reaction path during discharge of lithium-sulfur battery

Seiji Tsuzuki, Tomoaki Kaneko, Keitaro Sodeyama, Yasuhiro Umebayashi, Wataru Shinoda, Shiro Seki, K … 全著者表示

Physical chemistry chemical physics 23 ( 11 ) 6832 - 6840 2021年2月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Towards practical cells: Combined use of sparingly solvating electrolyte and titanium black as cathode additive for high-energy-density lithium–sulfur batteries

Jiali Liu, Shanglin Li, Mayeesha Marium, Binshen Wang, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watana … 全著者表示

Sustainable Energy & Fuels 5 ( 6 ) 1821 - 1831 2021年2月 [査読有り]

DOI Web of Science 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 共著

Towards practical cells: combined use of titanium black as a cathode additive and sparingly solvating electrolyte for high-energy-density lithium–sulfur batteries

Liu Jiali, Li Shanglin, Marium Mayeesha, Wang Binshen, Ueno Kazuhide, Dokko Kaoru, Watanabe Masayos … 全著者表示

Sustainable Energy & Fuels 5 1821 - 1831 2021年2月

CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Royal Society of Chemistry 共著

The lithium–sulfur (Li–S) battery is considered one of the most promising technologies for next-generation energy storage. To realise its practical applications, electrodes with high areal sulfur loading, low-cost raw materials, and easily accessible fabrication processes are essential. Herein, we demonstrated the effectiveness of a commercially available black pigment, titanium black (TiB), as a multi-functional additive for sulfur electrodes. Benefiting from the amphipathic nature of TiB, it was easy to obtain a homogenous coating on a current collector (>4 mg cm^(−2)) by applying a traditional slurry containing aqueous carboxymethyl cellulose/styrene-butadiene rubber as a binder. Contact angle measurements revealed much better electrolyte wettability for the electrode with the addition of TiB. Combined with a sparingly solvating electrolyte based on sulfolane and Li[N(SO_2CF_3)_2], the electrode showed excellent cycling performance and high coulombic efficiency at a relatively high current density. Finally, pouch cells were fabricated with a low electrolyte/sulfur (E/S) ratio of 3.2 μL mg^(−1), and a high energy density of 280 W h kg^(−1) was achieved. Subsequent investigation of the gassing behaviour revealed that swelling of the charged cells at 60 °C was suppressed for half a month. This study may pave the way for designing Li–S batteries with practical utility.

Understanding the Reductive Decomposition of Highly Concentrated Li Salt/Sulfolane Electrolytes during Li Deposition and Dissolution

Yosuke Ugata, Ryoichi Tatara, Toshihiko Mandai, Kazuhide Ueno, Masayoshi Watanabe, Kaoru Dokko

ACS Applied Energy Materials 4 ( 2 ) 1851 - 1859 2021年2月 [査読有り]

DOI Web of Science CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Publications 共著

Li deposition and dissolution in highly concentrated electrolytes consisting of sulfolane (SL) and two amide-type Li salts, LiN(SO2CF3)2 (LiTFSA) and LiN(SO2F)2 (LiFSA), were investigated. The chronopotentiometry test of Li/Cu cells containing these two electrolytes demonstrated that the reversibility of Li deposition/dissolution and the cycling performance were better in the LiFSA/SL electrolyte than in the LiTFSA/SL electrolyte. Gas analysis with electrochemical mass spectroscopy revealed that the SL molecules were reduced to form tetrahydrothiophene (THT) and butane in the LiTFSA/SL electrolyte during Li deposition. In contrast, these side reactions were significantly suppressed in the LiFSA/SL electrolyte. The X-ray photoelectron spectroscopy analysis for the deposited Li in the LiTFSA/SL electrolyte suggests that Li2O and sulfurous compounds were formed on the Li surface by the reductive decomposition of SL. For the LiFSA/SL electrolyte, the LiF-rich passivation layer derived from the FSA anion could effectively suppress further decomposition of SL, resulting in highly reversible Li deposition and dissolution.

Anion effects on Li ion transference number and dynamic ion correlations in glyme–Li salt equimolar mixtures

Keisuke Shigenobu, Masayuki Shibata, Kaoru Dokko, Masayoshi Watanabe, Kenta Fujii, Kazuhide Ueno

Physical chemistry chemical physics 23 ( 4 ) 2622 - 2629 2021年1月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Molecularly tunable polyanions for single-ion conductors and poly (solvate ionic liquids)

Wenxu Zhang, Shuting Feng, Mingjun Huang, Bo Qiao, Keisuke Shigenobu, Livia Giordano, Jeffrey Lopez … 全著者表示

Chemistry of materials 33 ( 2 ) 524 - 534 2021年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Publications 共著

Solvation Structure of Li+ in Concentrated Acetonitrile and N,N-Dimethylformamide Solutions Studied by Neutron Diffraction with 6Li/7Li Isotopic Substitution Methods

Yasuo Kameda, Shu Saito, Aoi Saji, Yuko Amo, Takeshi Usuki, Hikari Watanabe, Nana Arai, Yasuhiro Um … 全著者表示

The Journal of Physical Chemistry B 124 ( 46 ) 10456 - 10464 2020年11月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Publications 共著

Microphase-separated structures of ion gels consisting of ABA-type block copolymers and an ionic liquid: A key to escape from the trade-off between mechanical and transport properties

Haruna Mizuno, Kei Hashimoto, Ryota Tamate, Hisashi Kokubo, Kazuhide Ueno, Xiang Li, Masayoshi Wata … 全著者表示

Polymer 206 122849-1 - 122849-8 2020年10月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 共著

Upon combination of an ionic liquid (IL) with an amphiphilic ABA-type triblock copolymer, the insoluble A blocks aggregate to form mechanical frameworks and the soluble B blocks form ion-transport paths by incorporating the IL. Consequently, a self-standing ion gel, exhibiting the characteristic high ionic conductivity of ILs, can be obtained. In this study, we investigated the effect of microstructures formed by the block copolymer (spherical, cylindrical, gyroid, and lamellar structures) on the ionic conductivity and mechanical properties of the ion gel by focusing on the microstructures. As a result, an ion gel that formed an isotropic bicontinuous structure was successfully obtained via a heat-induced order-order transition. The structure was maintained even at room temperature, and the ion gel having a bicontinuous structure exhibited favorable mechanical properties (storage modulus, G' similar to 1.0 MPa) and good ionic conductivity (sigma similar to 0.1 mS cm(-1)). In contrast, the ion gels having anisotropic structures (cylindrical structure) exhibited weaker mechanical properties and lower ionic conductivity. The characteristics of bicontinuous structures may be the key to resolving the trade-off between mechanical and transport properties of electrolyte materials for electrochemical devices.

Effects of fluoroethylene carbonate addition to Li-glyme solvate ionic liquids on their ionic transport properties and Si composite electrode performance

Hitoshi Shobukawa, Keisuke Shigenobu, Shoshi Terada, Shinji Kondou, Kazuhide Ueno, Kaoru Dokko, Mas … 全著者表示

Electrochimica Acta 353 136559 2020年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Effects of Anion on Liquid Structures of Ionic Liquids at Graphene Electrode Interface Analyzed by Molecular Dynamics Simulations

Seiji Tsuzuki, Takenobu Nakamura, Tetsuya Morishita, Wataru Shinoda, Shiro Seki, Yasuhiro Umebayash … 全著者表示

Batteries & Supercaps 3 ( 7 ) 658 - 667 2020年7月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Structures and Electrochemistry of γ‑Butyrolactone Solvates of Na Salts

Ryoichi Tatara, So Nishimura, Yukihiro Okamoto, Kazuhide Ueno, Masayoshi Watanabe, Kaoru Dokko

The Journal of Physical Chemistry C 124 ( 29 ) 15800 - 15811 2020年6月 [査読有り]

DOI Web of Science CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

Phase behaviors, solvate structures, Na+ transport properties, electrochemical stability, and battery performance of binary Na salt and γ-butyrolactone (GBL) mixtures have been studied systematically. A concentrated [sodium bis(fluorosulfonyl)amide (NaFSA)]/[GBL] = 1/1 mixture remains in the liquid state at room temperature, and a single crystal of the same composition is obtained below room temperature. The Na metal/electrolyte interface is stabilized and continuous electrolyte decomposition is suppressed in molten [NaFSA]/[GBL] = 1/1, whereas GBL solvates of NaN(SO2CF3)2 (NaTFSA) and NaPF6 exhibit a continual increase in interfacial resistance at the Na metal electrode. Solvent-bridged (Na+−GBL−Na+) and anion-bridged (Na+−FSA−−Na+) structures are observed in the [NaFSA]/[GBL] = 1/1 single crystal. These ligand-bridged structures produce a remarkably high Na+ transference number of 0.84 due to dynamic ligand-exchange conduction of Na+ in the electrolyte. Although the ionic conductivity of [NaFSA]/[GBL] = 1/1 is less than that of typical Na+-based electrolytes, the rate capability of a Na0.44MnO2 electrode in molten [NaFSA]/[GBL] = 1/1 is slightly greater than that in 1 mol dm-3 NaPF6/propylene carbonate. This observation is attributed to a high Na+ transference number, which suppresses the development of a concentration gradient in Na+ batteries under anion-blocking conditions. These observations indicate that not only ionic conductivity but also Na+ transference number are essential electrolyte properties for achieving high rate capabilities in Na batteries.

Solvent effects on Li ion transference number and dynamic ion correlations in glyme- and sulfolane-based molten Li salt solvates

Keisuke Shigenobu, Kaoru Dokko, Masayoshi Watanabe, Kazuhide Ueno

Physical Chemistry Chemical Physics 20 ( 27 ) 15214 - 15221 2020年6月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Molten Li Salt Solvate-Silica Nanoparticle Composite Electrolytes with Tailored Rheological Properties

MARIUM Mayeesha, UENO Kazuhide, DOKKO Kaoru, WATANABE Masayoshi

Electrochemistry 88 ( 3 ) 174 - 177 2020年5月 [査読有り]

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人電気化学会共著

Nanocomposite electrolytes comprising molten Li salt solvates (MLSs) and inorganic fillers provide liquid-like processing and reasonably high Li ion transport properties. Thus, they can be potentially used as thermally-stable and mechanically-robust electrolytes. In this study, nanocomposite electrolytes exhibiting two distinct non-Newtonian rheological responses, i.e., shear thinning and shear thickening behaviors, were prepared using glyme- and sulfolane-based molten Li salt solvates and hydrophilic fumed silica without any surface modification of the silica. The rheological responses strongly depended on the anionic structure of the MLSs. The MLS-silica composites containing bis(trifluoromethanesulfonyl)amide (TFSA) and BF4 anions formed a shear thinning gel and shear thickening fluid, respectively. The characteristic rheological properties (elastic modulus for the shear thinning gel and the maximum peak viscosity and critical shear rate for the shear thickening system) were extensively tailored by the silica content in addition to the chemical structure of the MLSs, while the changes in their ion transport properties were moderate even in the presence of silica fillers.

その他リンク： https://ci.nii.ac.jp/naid/130007840150

Speciation Analysis and Thermodynamic Criterion of Solvate Ionic Liquids; Whether Ionic Liquids or Super-Concentrated Solutions?

Arai N, Watanabe H, Nozaki E, Seki S, Tsuzuki S, Ueno K, Dokko K, Watanabe M, Kameda Y, Umebayashi Y

The Journal of Physical Chemistry Letters 11 ( 11 ) 4517 - 4523 2020年4月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Effect of network homogeneity on mechanical, thermal and electrochemical properties of solid polymer electrolytes prepared by homogeneous 4-arm poly(ethylene glycols)

Monami Tosa, Kei Hashimoto, Hisashi Kokubo, Kazuhide Ueno, Masayoshi Watanabe

Soft Matter 16 ( 17 ) 4290 - 4298 2020年4月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Liquid‐State Optoelectronics Using Liquid Metal

Takashi Kozaki, Satoshi Saito, Yota Otsuki, Ryosuke Matsuda, Yutaka Isoda, Takuma Endo, Fumika Naka … 全著者表示

Advanced Erectonic Materials 6 ( 3 ) 2020年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Highly concentrated LiN(SO2CF3)2/dinitrile electrolytes: Liquid structures, transport properties, and electrochemistry

Yosuke Ugata, Ryoichi Tatara, Kazuhide Ueno, Kaoru Dokko and Masayoshi Watanabe

Journal of Chemical Physics 152 ( 10 ) 104502-1 - 104502-12 2020年3月 [査読有り]

DOI Web of Science PubMed CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AIP 共著

Liquid structures, transport properties, and electrochemical properties of binary mixtures of lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) and dinitrile solvents [succinonitrile (SN), glutaronitrile (GN), and adiponitrile (ADN)] were investigated. In the LiTFSA/SN and LiTFSA/ADN systems, the stable crystalline solvates of LiTFSA–(SN)1.5 [melting point (Tm): 59 °C] and LiTFSA–(ADN)1.5 (Tm: 50 °C) were formed, respectively. In contrast, the LiTFSA/GN mixtures of a wide range of compositions were found to be glass-forming liquids at room temperature. Raman spectroscopy of LiTFSA/GN liquid mixtures revealed that increasing the LiTFSA concentration results in the formation of the solvent-bridged network structure Li+–GN–Li+. In addition, the considerable formation of contact ion pairs and ionic aggregates was observed in highly concentrated electrolytes. In the liquids, the Li+ ion dynamically exchanged ligands (GN and TFSA) and higher LiTFSA concentrations led to an increase in the ratio of the self-diffusion coefficients of Li+ and TFSA−, DLi/DTFSA, as determined by pulsed field gradient NMR spectroscopy. The Li+ transference number (tLi+ ) of the [LiTFSA]/[GN] = 1/1.5 electrolyte in an electrochemical cell under anion-blocking conditions was estimated to be as high as 0.74. Furthermore, electrochemical measurements revealed that the reductive stability of the LiTFSA/GN electrolyte increases with increasing LiTFSA concentration. A [LiTFSA]/[GN] = 1/1.5 electrolyte is stable against the Li metal electrode, provided that the polarization is relatively small. Owing to high tLi+ , a Li–S battery with the [LiTFSA]/[GN] = 1/1.5 electrolyte showed a high rate discharge capability despite its low ionic conductivity (0.21 mS cm−1) at room temperature.

High Transference Number of Na Ion in Liquid-State Sulfolane Solvates of Sodium Bis (fluorosulfonyl) amide

Yukihiro Okamoto, Seiji Tsuzuki, Ryoichi Tatara, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

The Journal of Physical Chemistry C 124 ( 8 ) 4459 - 4469 2020年1月 [査読有り]

DOI Web of Science CiNii Research 学術情報リポジトリ

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

The phase behavior, Na+ coordination structures, and transport and electrochemical properties of binary mixtures of NaN(SO2F)2 (NaFSA) and sulfolane (SL) solvent were investigated. The NaFSA and SL form stable solvates at molar ratios [NaFSA]/[SL] = 1/3 and 1/0.5, and there is a crystallinity gap in the range 1/1.6 ≤ [NaFSA]/[SL] ≤ 1/0.8. In the crystals of both NaFSA-(SL)3 and NaFSA-(SL)0.5, the solvent-bridged Na+−SL−Na+ and anion-bridged Na+−FSA−Na+ structures are formed. In the crystallinity gap, the mixtures remain liquid at room temperature and can be regarded as molten SL-solvates of NaFSA. The Raman spectra of the molten solvates suggest that the solvent- and anion-bridged structures are partially maintained even in the liquid. However, Na+ ions exchange the ligands (solvent and anion) dynamically in the liquids. This significantly affects the Na+ ion transport in the liquids under an anion-blocking condition. The Na+ ion transference numbers (tNa+) of molten solvates were estimated using symmetric Na/Na cells, and a molten solvate of [NaFSA]/[SL] = 1/1 exhibited a high tNa+ of 0.8. Charge and discharge tests of a Na/Na0.44MnO2 battery were performed with the molten solvate as the electrolyte. The rate capability of the battery was found to be significantly affected by tNa+ in the electrolyte.

Redox-active glyme–Li tetrahalogenoferrate (iii) solvate ionic liquids for semi-liquid lithium secondary batteries

Yuta Kemmizaki, Yu Katayama, Hiromori Tsutsumia, Kazuhide Ueno

RSC Advances 10 ( 7 ) 4129 - 4136 2020年1月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Rheological and Ionic Transport Properties of Nanocomposite

Mayeesha Marium, Mahfuzul Hoque, Muhammed Shah Miran, Morgan L. Thomas, Izuru Kawamura, Kazuhide Ue … 全著者表示

Langmuir 36 ( 1 ) 148 - 158 2020年1月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS 共著

Graphite–Lithium Sulfide Battery with a Single-Phase Sparingly Solvating Electrolyte

Taisho Seita, Yoshiharu Matsumae, Jiali Liu, Ryoichi Tatara, Kazuhide Ueno, Kaoru Dokko, Masayoshi … 全著者表示

ACS Energy Letters 5 ( 1 ) 1 - 7 2020年1月

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

Effects of Polysulfide Solubility and Li Ion Transport on Performance of Li–S Batteries Using Sparingly Solvating Electrolytes

Masato Yanagi, Kazuhide Ueno, Ayumi Ando, Shanglin Li, Yoshiharu Matsumae, Jiali Liu, Kaoru Dokko, … 全著者表示

Journal of The Electrochemical Society 167 ( 7 ) 2020年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Electrochemical Society 共著

プリンテッドリチウムイオン電池への応用に向けた液体金属電極の作製

遠藤拓馬, 西躰優希, 上野和秀, 太田裕貴

マイクロ・ナノ工学シンポジウム 2020 ( 0 ) 26A3 - MN2-5 2020年

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本機械学会共著

The liquid metal is in a liquid state at room temperature and compatible with easily printing process. In this study, liquid metal composite composed of liquid metal, lithium titanate (LTO), and nickel powder was utilized as a conductive agent and binder for the printing process of lithium-ion batteries. Liquid metal electrodes were prepared by mixing the liquid metal with LTO and nickel powder as the anode. The composite was coated on copper foil to form an anode. Using the anode and counter electrode made by carbon coated LFP, coin cell was assembled and the functionality was evaluated. The results showed that the electrode could be used as the anode of the lithium-ion battery. This electrode is expected to be used for printed batteries, which lead easy integration and mechanical flexibility.

その他リンク： https://ci.nii.ac.jp/naid/130008053310

液体金属ナノ粒子を用いたストレッチャブルリチウムイオンバッテリの作製

水口覚, 遠藤拓馬, 松田涼佑, 上野和英, 太田裕貴

マイクロ・ナノ工学シンポジウム 2020 ( 0 ) 28A3 - MN3-1 2020年

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本機械学会共著

Stretchable lithium-ion batteries have been highly demanded in the IoT society. Liquid-metal (LM) has highly stretchable and deformable, and it has self-healing properties associated with charge-discharge. Here, we investigated the electrochemical characteristics and improvement of robustness using liquid-metal nano particles (LMNP) electrode on stretchable lithium-ion batteries. LMNP was prepared by ultrasonication of the liquid metal alloy composed of Ga and Sn. Stretchable LMNP electrode was fabricated by coating the slurry including LMNP onto a porous silicone rubber substrate. The electrodes of coin cells were tested after 100 % tensile strain 50 times or 100 times. The cells were galvanostatically cycled and indicated higher robustness than stretchable SiNP electrode. And we fabricated batteries using stretchable electrodes and confirmed the batteries could work.

その他リンク： https://ci.nii.ac.jp/naid/130008053245

HIGHLY DEFORMABLE OPTOELECTRONICS USING LIQUID METAL

Kozaki, T; Satoshi, S; Otsuki, Y; Matsuda, R; Isoda, Y; Endo, T; Nakamura, F; Araki, T; Furukawa, T … 全著者表示

2020 33RD IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2020) 1230 - 1233 2020年

DOI Web of Science

記述言語：日本語掲載種別：研究論文（学術雑誌）共著

Excellent dispersibility of single-walled carbon nanotubes in highly concentrated electrolytes and application to gel electrode for Li-S batteries

Ryota Tamate, Aya Saruwatari, Azusa Nakanishi, Yoshiharu Matsumae, Kazuhide Ueno, Kaoru Dokko, Masa … 全著者表示

Electrochemistry communications 109 2019年12月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Dynamic Chelate Effect on the Li+-Ion Conduction in Solvate Ionic Liquids

Nana Arai, Hikari Watanabe, Tsuyoshi Yamaguchi, Shiro Seki, Kazuhide Ueno, Kaoru Dokko, Masayoshi … 全著者表示

The Journal of Physical Chemistry C 123 ( 50 ) 30228 - 30233 2019年12月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

Thermodynamic Effect of Anion Activity on Electrochemical Reactions Involving Li+ Ions in Room‐Temperature Ionic Liquids

Dr. Ryoichi Tatara ,Prof. Kazuhide Ueno ,Prof. Kaoru Dokko ,Prof. Masayoshi Watanabe

ChemElectroChem 17 ( 6 ) 2019年8月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Wiley Online Library 共著

Glyme–Li salt equimolar molten solvates with iodide/triiodide redox anions

Keisuke Shigenobu, Azusa Nakanishi, Kazuhide UenoORCID,Kaoru DokkoORCID,Masayoshi Watanabe

Journals, Books and Databases ( 9 ) 22668 - 22675 2019年7月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Royal Society of Chemistry 共著

Temperature Dependence of Self-Diffusion Coefficients of Ions and Solvents in Ethylene Carbonate, Propylene Carbonate, and Diethyl Carbonate Single Solutions and Ethylene Carbonate + Diethyl Carbonate Binary Solutions of LiPF6 Studied by NMR

Azusa Nakanishi,Kazuhide Ueno,Daiki Watanabe,Yosuke Ugata,Yoshiharu Matsumae,Jiali Liu,MorganL. Tho … 全著者表示

The Journal of Physical Chemistry C ( 123,23 ) 14229 - 14238 2019年5月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Publications 共著

Li-ion hopping conduction in highly concentrated lithium bis(fluorosulfonyl)amide/dinitrile liquid electrolytes

Yosuke Ugata, Morgan L. Thomas, Toshihiko Mandai, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Journals, Books and Databases ( 21 ) 9759 - 9768 2019年4月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：The Royal Society of Chemistry’s 単著

Effects of Sulfur Loading, Cathode Porosity, and Electrolyte Amount on Li-S Battery Performance with Solvate Ionic Liquid Electrolyte

Yoshiharu MATSUMAE, Kenzo OBATA, Ayumi ANDO, Masato YANAGI, Yutaro KAMEI, Kazuhide UENO, Kaoru DOKK … 全著者表示

Electrochemistry 87 ( 5 ) 254 - 259 2019年4月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：J-STAGE 共著

Polymer electrolytes based on a homogeneous poly(ethylene glycol)network and their application to polymer actuators

Ryosuke Shioiri, Hisashi Kokubo, Tatsuhiro Horii, Yumi Kobayashi, Kei Hashimoto,Kazuhide Ueno, Masa … 全著者表示

Electrochimica Acta 298 866 - 873 2019年3月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Ionic transport in highly concentrated lithium bis(fluorosulfonyl)amide electrolytes with ketosolvents: structural implications for ionhopping conduction in liquid electrolytes

Shinji Kondou,Morgan L. Thomas,Toshihiko Mandai,Kazuhide Ueno,Kaoru Dokko,Masayoshi Watanabe

Phys. Chem. Chem. Phys ( 21 ) 5097 - 5105 2019年2月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

液体材料を用いた光反応性電子素子の開発

神﨑崇志, 丸尾昭二, 渡邉正義, 上野和英, 太田裕貴, 斎藤聖, 小槻耀太, 松田涼佑, 磯田豊, 遠藤拓馬, 中村史香, 荒木拓人, 古川太一

マイクロ・ナノ工学シンポジウム 2019 ( 0 ) 2019年

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本機械学会共著

Liquid-state electronics utilizing functional liquids confined in soft templates as the sensing and actuating component present the ideal platform for enabling conformal coverage of electronic systems on curved and soft surfaces. However, to date, optoelectronic devices based on functional liquid materials as represented by photodetectors and optical memories still have not been proposed; this advancement is crucial to scaling up current liquid-state devices to a system level. Here, this study proposes optoelectronic devices based on liquid metal and photo-switchable ionic liquid with liquid-liquid heterojunction technology. The sensing and memory schemes we present are generic for different liquid-state devices, enabling different functionality to be added to the liquid-state electronics. As a proof of concept, we demonstrate a light sensor composed of the ionic liquid, and an optical memory using a composite of the ionic liquid and polypropylene glycol. These devices are important advancements towards the realization of liquid-state electronic systems.

その他リンク： https://ci.nii.ac.jp/naid/130007846798

1．リチウム硫黄電池用電解液

上野和英, 獨古薫, 渡邉正義

電気化学 87 ( 0 ) 195 - 199 2019年

DOI CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人電気化学会共著

その他リンク： https://ci.nii.ac.jp/naid/130007703260

Key factor governing the physicochemical properties and extent of proton transfer in proticionic liquids: DpKa or chemical structure?

Muhammed Shah Miran,Mahfuzul Hoque,Tomohiro Yasuda,Seiji Tsuzuki,Kazuhide Ueno,Masayoshi Watanabe

Phys. Chem. Chem. Phys ( 21 ) 418 - 426 2018年12月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Liquid structures and transport properties of lithium bis(fluorosulfonyl)amide/glyme solvate ionic liquids for lithium batteries

Shoshi Terada, Kohei Ikeda, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Aust. J. Chem. 2018年9月 [査読有り] [招待有り]

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CSIRO Publishing 共著

その他リンク： http://www.publish.csiro.au/ch/Fulltext/CH18270

Enhanced electrochemical stability of molten Li salt hydrate electrolytes by addition of divalent cations

Shinji Kondou, Erika Nozaki, Shoshi Terada, Morgan L. Thomas, Kazuhide Ueno, Yasuhiro Umebayashi, K … 全著者表示

J. Phys. Chem. C 122 ( 35 ) 20167–20175 2018年8月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

その他リンク： https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.8b06251

Glyme-sodium bis(fluorosulfonyl)amide complex electrolytes for sodium ion batteries

Shoshi Terada, Hiroko Susa, Seiji Tsuzuki, Toshihiko Mandai, Kazuhide Ueno, Kaoru Dokko, Masayoshi … 全著者表示

J. Phys. Chem. C 122 ( 29 ) 16589–16599 2018年7月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：American Chemical Society 共著

その他リンク： https://pubs.acs.org/doi/10.1021/acs.jpcc.8b04367

Soft materials based on colloidal self-assembly in ionic liquids

Kazuhide Ueno

Polym. J. 2018年6月 [査読有り] [招待有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： https://www.nature.com/articles/s41428-018-0083-1

Protic ionic liquids with primary alkylamine-derived cations: the dominance of hydrogen bonding on observed physicochemical properties

Mahfuzul Hoque, Morgan L. Thomas, Muhammed Shah Miran, Mio Akiyama, Mayeesha Marium, Kazuhide Ueno, … 全著者表示

RSC Adv. 8 ( 18 ) 9790 - 9794 2018年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2018/ra/c8ra00402a#!divAbstract

Redox active glyme-Li salt solvate ionic liquids based on tetrabromoferrate(III)

Yuta Kemmizaki, Hiromori Tsutsumi, Kazuhide Ueno

Electrochemistry 86 ( 2 ) 46 - 51 2018年1月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：electrochemical society of japan 共著

その他リンク： https://www.jstage.jst.go.jp/article/electrochemistry/advpub/0/advpub_17-00075/_article/-char/ja/

Electrolyte composition in Li/O₂ batteries with LiI redox mediators: solvation effects on redox potentials and implications for redox shuttling

Azusa Nakanishi, Morgan L. Thomas Hoi-Min Kwon, Yuki Kobayashi, Ryoichi Tatara, Kazuhide Ueno, Kaor … 全著者表示

J. Phys. Chem. C 122 ( 3 ) 1522 - 1534 2018年1月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS 共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b11859

Molecular dynamics study of thermodynamic stability and dynamics of [Li(Glyme)]+ complex in lithium-glyme solvate ionic liquids

Wataru Shinoda, Yuta Hatanaka, Masashi Hirakawa, Susumu Okazaki, Seiji Tsuzuki, Kazuhide Ueno, Masa … 全著者表示

J. Chem. Phys. 2018年1月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://aip.scitation.org/doi/full/10.1063/1.5009814

Direct Evidence for Li Ion Hopping Conduction in Highly Concentrated Sulfolane-Based Liquid Electrolytes

Kaoru Dokko,Daiki Watanabe,Yosuke Ugata,Morgan L. Thomas,Seiji Tsuzuki,Wataru Shinoda,Kei Hashimoto … 全著者表示

THE JOURNAL OF PHYSICAL CHEMISTRY B ( 122 ) 10736 - 10745 2018年 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

From Ionic Liquids to Solvate Ionic Liquids: Challenges and Opportunities for Next Generation Battery Electrolytes

Watanabe Masayoshi, Dokko Kaoru, Ueno Kazuhide, Thomas Morgan L.

Bulletin of the Chemical Society of Japan 91 ( 11 ) 1660 - 1682 2018年 [査読有り] [招待有り]

DOI CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本化学会共著

Certain concentrated mixtures of lithium salt and solvent (ligand) are no longer simple solutions, but categorized as solvate ionic liquids (SILs), where the solvent strongly coordinates to the cation to form a solvate, a negligible amount of free solvent remains, and thus the SIL consists of the solvate cation and the anion. Typical examples are mixtures of lithium bis(trifluoromethane sulfonyl)amide (Li[TFSA]) and certain glymes <img align="middle" src="./Graphics/abst-20180216_1.png"/>. The successful formation of a SIL greatly depends on both the ligand and lithium salt structures. To obtain robust and long-lived solvates, a ligand exhibiting a chelate effect is essential and n = 3 and 4 (i.e. triglyme and tetraglyme) are suitable for the formation of lithium solvates. The Lewis basicity of the lithium salt anion also significantly affects the formation of SILs. Specifically, a weak Lewis basicity promotes the formation of a SIL, since the ligand-Li+ interaction overwhelms the Li+-anion interaction. SILs can be diluted with rather low polarity solvents to increase the ionic conductivity, where the solvate structure is maintained even after the dilution. SILs exhibit unique features as electrolytes, including the enhancement of oxidation stability of the component glymes, unique Li+ transport through ligand exchange when interfacial electrochemical reactions are occurring, the inhibition of aluminum corrosion when Al foil is used as a cathode current collector, poorly-solubilizing towards ionic electroactive materials, and electrochemical graphite intercalation reactions. These features greatly enhance the possibility for application of SILs as next generation lithium battery electrolytes. Furthermore, new polymer electrolytes containing SILs have been proposed, simultaneously enabling film-processability, high ionic conductivity, thermal stability, and a wide potential window. Preservation of the solvate structure in the polymeric phases is pivotal to such achievements.

その他リンク： https://ci.nii.ac.jp/naid/130007511409

Polymer electrolytes containing solvate ionic liquids: a new approach to achieve high ionic conductivity, thermal stability, and a wide potential window

Yuzo Kitazawa, Kaori Iwata, Ryosuke Kido, Satoru Imaizumi, Seiji Tsuzuki, Wataru Shinoda, Kazuhide … 全著者表示

Chem. Mater. 30 ( 1 ) 252 - 261 2017年12月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS 共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.chemmater.7b04274

Long-range ion-ordering in salt-concentrated lithium-ion battery electrolytes: a combined high-energy X-ray total scattering and molecular dynamics simulation study

Kenta Fujii, Masaru Matsugami, Kazuhide Ueno, Koji Ohara, Michiru Sogawa, Takashi Utsunomiya, Masay … 全著者表示

J. Phys. Chem. C 121 ( 41 ) 22720 - 22726 2017年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS 共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b08243

Advanced materials based on polymers and ionic liquids

Yuzo Kitazawa, Kazuhide Ueno, Masayoshi Watanabe

Chem. Rec. 2017年9月 [査読有り] [招待有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：John Wiley & Sons, Inc. 共著

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/tcr.201700041/full

Steric effect on Li+ coordination and transport properties in polyoxetane-based polymer electrolytes bearing nitrile groups

Ryansu Sai, Kazuhide Ueno, Kenta Fujii, Yohei Nakano, Hiromori Tsutsumi

RSC Adv. 7 ( 60 ) 37975 - 37982 2017年8月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：RSC 共著

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2017/RA/C7RA07636C#!divAbstract

Effect of the cation on the stability of cation-glyme complexes and their interactions with the [TFSA]- anion

Seiji Tsuzuki, Toshihiko Mandai, Soma Suzuki, Wataru Shinoda, Takenobu Nakamura, Tetsuya Morishita, … 全著者表示

Phys. Chem. Chem. Phys. 19 18262 - 18272 2017年7月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：RSC 共著

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2017/cp/c7cp02779f#!divAbstract

Effect of variation in anion type and glyme length on the nanostructure of the solvate ionic liquid/graphite interface as a function of potential

Andre Cook, Kazuhide Ueno, Masayoshi Watanabe, Rob Atkin, Hua Li

J. Phys. Chem. C 121 ( 29 ) 15728 - 15734 2017年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS 共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b03414

Soluble sulfur-based copolymers prepared from elemental sulfur and alkenyl alcohol as positive active material for lithium-sulfur batteries

Kazuhiro Yamabuki, Kanae Itaoka, Takahiro Shinchi, Nobuko Yoshimoto, Kazuhide Ueno, Hiromori Tsutsu … 全著者表示

Polymer 117 ( 19 ) 225 - 230 2017年4月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER 共著

その他リンク： http://www.sciencedirect.com/science/article/pii/S0032386117304184

Oxygen reduction reaction in highly concentrated electrolyte solutions of lithium bis (trifluoromethanesulfonyl) amide/dimethyl sulfoxide

Ryoichi Tatara, David G Kwabi, Thomas P Batcho, Michal Tulodziecki, Kenta Watanabe, Hoi-Min Kwon, M … 全著者表示

J. Phys. Chem. C 121 ( 17 ) 9162 - 9172 2017年4月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.7b01738

Stability of glyme solvate ionic liquid as an electrolyte for rechargeable Li−O2 batteries

Hoi-Min Kwon, Morgan L Thomas, Ryoichi Tatara, Yoshiki Oda, Yuki Kobayashi, Azusa Nakanishi, Kazuhi … 全著者表示

ACS Applied Materials & Interfaces 9 ( 7 ) 6014 - 6021 2017年1月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acsami.6b14449

Role of polar side chains in Li+ coordination and transport properties of polyoxetane-based polymer electrolytes

Ryansu Sai, Kazuhide Ueno, Kenta Fujii, Yohei Nakano, Naho Shigaki, Hiromori Tsutsumi

Phys. Chem. Chem. Phys. 19 ( 7 ) 5185 - 5194 2017年1月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

リチウムイオン伝導性高分子電解質中の極性側鎖の影響について、イオン伝導性、リチウムイオン溶媒和構造の観点から調べた論文である。側鎖にニトリル基を有する高分子電解質は塩濃度の増加に伴いガラス転移温度が低下し、高いイオン伝導性を示すことを明らかにした。

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2017/CP/C6CP08386B#!divAbstract

Application of ionic liquids to energy storage and conversion materials and devices

Masayoshi Watanabe, Morgan L. Thomas, Shiguo Zhang, Kazuhide Ueno, Tomohiro Yasuda, Kaoru Dokko

Chem. Rev. 117 ( 10 ) 7190 - 7239 2017年1月 [査読有り] [招待有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

イオン液体を用いたエネルギーデバイスについて最近の研究を網羅的に調べた総説である。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.chemrev.6b00504

Suppression of water absorption by molecular design of ionic liquid electrolyte for Li–air battery

Morgan L. Thomas, Yoshiki Oda, Ryoichi Tatara, Hoi-Min Kwon, Kazuhide Ueno, Kaoru Dokko, Masayoshi … 全著者表示

Adv. Energy Mater. 7 ( 3 ) 1601753 2016年10月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY 共著

リチウム空気電池に適した電解液を探索するため疎水性イオン液体型電解質の水分吸収挙動と酸素還元特性を調べた。

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/aenm.201601753/abstract

A design approach to lithium-ion battery electrolyte based on diluted solvate ionic liquids

Kazuhide Ueno, Junichi Murai, Heejoon Moon, Kaoru Dokko, Masayoshi Watanabe

J. Electrochem. Soc. 164 ( 1 ) A6088 - A6094 2016年10月 [査読有り] [招待有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELECTROCHEMICAL SOC INC 共著

トルエンまたはPCで希釈したリチウム溶媒和イオン液体の電気化学特性やアルミ腐食耐性、LiCoO2正極、黒鉛負極との適合性について詳細に調べた論文である。溶媒和イオン液体をトルエンで希釈した電解液を用いてもリチウムイオン電池が作動する事を示した。これにより新しい電解液の設計指針を提案した。

その他リンク： http://jes.ecsdl.org/content/164/1/A6088.abstract

Dissociation and diffusion of glyme-sodium bis (trifluoromethanesulfonyl) amide complexes in hydrofluoroether-based electrolytes for sodium batteries

Shoshi Terada, Hiroko Susa, Seiji Tsuzuki, Toshihiko Mandai, Kazuhide Ueno, Yasuhiro Umebayashi, Ka … 全著者表示

J. Phys. Chem. C 120 ( 41 ) 23339 - 23350 2016年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

ハイドロフルオロエーテルで希釈したナトリウム溶媒和イオン液体のイオン輸送特性、錯カチオンの安定性、配位構造に関して調査した。ハイドロフルオロエーテルで希釈することで、イオン伝導性は著しく改善され、ナトリウム系二次電池の性能に大きく影響を及ぼすことを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b06804

Optimization of pore structure of cathodic carbon supports for solvate ionic liquid electrolytes-based lithium-sulfur batteries

Shiguo Zhang, Ai Ikoma, Zhe Li, Kazuhide Ueno, Xiaofeng Ma, Kaoru Dokko, Masayoshi Watanabe

ACS Appl. Mater. Int. 8 ( 41 ) 27803 - 27813 2016年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

様々なサイズの細孔を持つ炭素を硫黄-炭素複合電極に用い、イオン液体電解液も用いたリチウム硫黄電池特性の多孔炭素依存性を調べた論文である。放電容量は炭素材料の比表面積よりも細孔体積に強く依存し、細孔体積が大きな炭素ほど大きな放電容量を示すことが明らかになった。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acsami.6b09989

Categorizing molten salt complexes as ionic liquids and their applications to battery electrolytes

Kazuhide Ueno

Electrochemistry 84 ( 9 ) 674 - 680 2016年9月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELECTROCHEMICAL SOC JAPAN 単著

Li塩-グライム類の常温溶融錯体をモデルとして、溶媒和イオン液体と濃厚電解液に分類する研究を纏めた総合論文である。また、溶媒和イオン液体を電解液に用いたリチウム硫黄電池の最近の成果についても述べられている。

その他リンク： https://www.jstage.jst.go.jp/article/electrochemistry/84/9/84_16-5-E2650/_article

Li+ local structure in Li–tetraglyme solvate ionic liquid revealed by neutron total scattering experiments with the 6/7Li isotopic substitution technique

Soshi Saito, Hikari Watanabe, Yutaka Hayashi, Masaru Matsugami, Seiji Tsuzuki, Shiro Seki, José N … 全著者表示

J. Phys. Chem. Lett. 7 ( 14 ) 2832 - 2837 2016年7月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

溶媒和イオン液体[Li(G4)][TFSA]のLi+イオンの局所構造を調べるため、6/7Li同位体置換法により各種サンプルを調製し、中性子全散乱実験を行った。テトラグライムの5つの酸素原子の中の末端酸素の一つはLi+の配位から外れているものもあることが明らかになった。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.6b01266

Gel polymer electrolytes based on poly (methacrylamide) derivative having branched pendant with terminal nitrile groups

Yohei Nakano, Kohsuke Shinke, Kazuhide Ueno, Hiromori Tsutsumi

Solid State Ionics 293 13 - 17 2016年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER 共著

側鎖末端にニトリル基を有するポリメタクリルアミド系高分子固体電解質に可塑剤としてPCを添加し、イオン伝導性を増加させることを試みた。これにより室温で10−4Scm-1以上のイオン伝導性を示すゲル電解質が調製可能となった。

その他リンク： http://www.sciencedirect.com/science/article/pii/S0167273816301692

Self-assembly of polyether diblock copolymers in water and ionic liquids

Yumi Kobayashi, Yuzo Kitazawa, Takahiro Komori, Kazuhide Ueno, Hisashi Kokubo and Masayoshi Watanabe

Macromol. Rapid. Comm. 37 ( 14 ) 1207 - 1211 2016年5月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY 共著

感温性セグメントと親溶媒セグメントから成るエーテル系ジブロック共重合体の会合状態を水中とイオン液体中でそれぞれ検討した論文である。熱分析の結果、相転移に伴うエンタルピー、エントロピー変化が水中に比べて、イオン液体中で極めて小さくなることが分かった。

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/marc.201600137/abstract

Li+ local structure in hydrofluoroether diluted Li-glyme solvate ionic liquid

Soshi Saito, Hikari Watanabe, Kazuhide Ueno, Toshihiko Mandai, Shiro Seki, Seiji Tsuzuki, Yasuo Kam … 全著者表示

J. Phys. Chem. B 120 ( 13 ) 3378 - 3387 2016年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

ハイドロフルオロエーテルで希釈した溶媒和イオン液体のLi+イオンの局所構造を調べるため、ラマン分光測定、高エネルギーX線回折実験、MDシミュレーションを行った。ハイドロフルオロエーテルで希釈した溶媒和イオン液体の錯カチオンは安定に存在していることが明らかになった。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcb.5b12354

Effects of compatibility of polymer binders with solvate ionic liquid electrolytes on discharge and charge reactions of lithium-sulfur batteries

Toshitada Nakazawa, Ai Ikoma, Ryosuke Kido, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

J. Power Sources 307 746 - 752 2016年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER 共著

リチウム硫黄電池の硫黄-炭素複合正極に用いる高分子バインダーと溶媒和イオン液体の相溶性を考慮し、けん化度の異なるポリビニルアルコールをバインダーとした際の充放電特性を調べた。適切なけん化度を有するポリビニルアルコールバインダーを用いると高容量且つサイクル安定性の高いリチウム硫黄電池が得られることが明らかとなった。

その他リンク： http://www.sciencedirect.com/science/article/pii/S0378775316300453

Thermal and electrochemical stability of tetraglyme-magnesium bis (trifluoromethanesulfonyl) amide complex: electric field effect of divalent cation on solvate stability

Shoshi Terada, Toshihiko Mandai, Soma Suzuki, Seiji Tsuzuki, Katsuya Watanabe, Yutaro Kamei, Kazuhi … 全著者表示

J. Phys. Chem. C 120 ( 3 ) 1353 - 1365 2016年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

Mg[TFSA]2とテトラグライムから形成される溶媒和物の相図、配位構造、イオン輸送特性、電気化学特性を調べることで、2価のカチオンによる錯カチオンの安定性について検討した。2価カチオンとグライム間の強い静電相互作用によってグライム分子の酸化分解電気化学安定性が高くなることを見出した。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b09779

Solid polymer electrolytes prepared from poly(methacrylamide) derivative having tris(cyanoethoxymethyl) group as its side chain

Yohei Nakano, Kohsuke Shinke, Kazuhide Ueno, Hiromori Tsutsumi

Solid State Ionics 286 1 - 6 2015年12月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER 共著

側鎖に複数のシアノ基を有するポリメタクリルアミドにLi塩を溶解させ、高分子固体電解質としての特性を評価した。IR測定よりシアノ基がLi+に配位していることを確認し、それが比較的高いイオン伝導性を示す要因であると考えられた。

その他リンク： http://www.sciencedirect.com/science/article/pii/S0167273815004488

Li+ solvation and ionic transport in lithium solvate ionic liquids diluted by molecular solvents

Kazuhide Ueno, Junichi Murai, Kohei Ikeda, Seiji Tsuzuki, Mizuho Tsuchiya, Ryoichi Tatara, Toshihik … 全著者表示

J. Phys. Chem. C 120 ( 29 ) 15792 - 15802 2015年12月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

溶媒和イオン液体電解液の欠点である高粘性に伴う低イオン伝導性を補うため、溶媒和イオン液体を分子性溶媒で希釈した電解液を調製した。様々な電解液中で錯カチオンの安定性を評価し、錯カチオンが安定な分子性溶媒の条件を明らかにした。

その他リンク： http://pubs.acs.org/doi/full/10.1021/acs.jpcc.5b11642

Thermosensitive soft glassy colloidal arrays of block copolymer grafted silica nanoparticles in an ionic liquid

Kazuhide Ueno, Toshimichi Fukai, Masayoshi Watanabe

Polym. J. 48 ( 3 ) 289 - 294 2015年11月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：NATURE PUBLISHING GROUP 共著

温度応答性高分子を一成分とするブロック共重合体を修飾した単分散シリカ粒子を高濃度でイオン液体中に分散し、コロイドガラスを形成させた。このコロイドガラスは温度変化に従い、反射スペクトルのシフトを示した。このことより、温度によるコロイドガラスの角度依存性の無い構造色の制御を可能とする材料の創製に成功した。

その他リンク： http://www.nature.com/pj/journal/v48/n3/full/pj2015105a.html

Lithium-tin alloy/sulfur battery with a solvate ionic liquid electrolyte

Kohei Ikeda, Shoshi Terada, Toshihiko Mandai, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Electrochemistry 83 ( 10 ) 914 - 917 2015年10月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELECTROCHEMICAL SOC JAPAN 共著

リチウム溶媒和イオン液体を電解液、硫黄-炭素複合体を正極、リチウム錫合金を負極に用いた硫黄電池の充放電特性を調査した論文である。電解液に溶媒和イオン液体を用いることで多硫化リチウムの溶解を抑制、リチウム錫合金負極を用いることでリチウムデンドライト成長を抑制できることを示した。

その他リンク： https://www.jstage.jst.go.jp/article/electrochemistry/83/10/83_15-E00101/_article

One-pot pyrolysis of lithium sulfate and graphene nanoplatelet aggregates: in situ formed Li2S/graphene composite for lithium–sulfur batteries

Zhe Li, Shiguo Zhang, Ce Zhang, Kazuhide Ueno, Tomohiro Yasuda, Ryoichi Tatara, Kaoru Dokko, Masayo … 全著者表示

Nanoscale 7 ( 34 ) 14385 - 14392 2015年7月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

Li2SO4とグラフェンナノシートを原料として一段階でLi2S-グラフェン複合体を得ることを報告した論文である。この方法を用いることで簡便にリチウム硫黄電池のLi2S正極を作製することが可能で、溶媒和イオン液体系電解液と組み合わせることで良好な充放電特性を示すことを明らかにした。

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2015/NR/c5nr03201f#!divAbstract

One-step, template-free synthesis of highly porous nitrogen/sulfur-codoped carbons from a single protic salt and their application to CO2 capture

Shiguo Zhang, Zhe Li, Kazuhide Ueno, Ryoichi Tatara, Kaoru Dokko, Masayoshi Watanabe

J. Mater. Chem. A 3 ( 34 ) 17849 - 17587 2015年7月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

ブレンステッド酸とブレンステッド塩基の中和反応で得られる[Allyl-NH3][HSO4]を炭素化すると、[HSO4]-アニオンが触媒として働き、細孔分布が狭いミクロ孔を有する高比表面積なN-S含有炭素(1149 m2g-1)が得られることを見出した。この炭素材料のCO2吸収特性を評価した論文である。

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2015/TA/c5ta03575a#!divAbstract

Structural and aggregate analyses of (Li salt + glyme) mixtures: the complex nature of solvate ionic liquids

Karina Shimizu, Adilson Freitas, Rob Atkin, Gregory Warr, Paul Anthony FitzGerald, Hiroyuki Doi, So … 全著者表示

Phys. Chem. Chem. Phys. 17 ( 34 ) 22321 - 22335 2015年7月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

様々なLi塩とトリグライムまたはテトラグライムの等モル混合で得られる溶媒和物の配位状態についてMDシミュレーションによって検討した論文である。対アニオン構造によって配位していないグライム分子の割合が異なり、実験結果を良く再現する結果が得られた。

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C5CP03414K#!divAbstract

Adsorption of polyether block copolymers at silica–water and silica–ethylammonium nitrate interfaces

Zhengfei Chen, Yumi Kobayashi, Grant Bruce Webber, Kazuhide Ueno, Masayoshi Watanabe, Gregory G War … 全著者表示

Langmuir 31 ( 25 ) 7025 - 7031 2015年6月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

ポリエーテル系ブロック共重合体のシリカ表面における吸着挙動を水中、イオン液体中で原子間力顕微鏡観察より評価した。媒体の新疎水性バランスから水中では球状ミセルを形成するがイオン液体中ではワームライクミセルを形成し表面に吸着することを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b01500

Recent advance in electrolytes for lithium-sulfur batteries

Shiguo Zhang, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Adv. Energy. Mater. 5 ( 16 ) 1500117 2015年4月 [査読有り] [招待有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY 共著

最近のリチウム硫黄電池に用いられている電解液とその電池特性との関係性を纏めた総説である。有機電解液、イオン液体電解液、固体電解質、電解液への添加剤などに関する近年の報告例を網羅している。

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/aenm.201500117/abstract

Protic-salt-derived nitrogen/sulfur-codoped mesoporous carbon for the oxygen reduction reaction and supercapacitors

Shiguo Zhang, Ai Ikoma, Kazuhide Ueno, Zhengjian Chen, Kaoru Dokko, and Masayoshi Watanabe

ChemSusChem 8 ( 9 ) 1608 - 1617 2015年4月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY 共著

ブレンステッド酸とブレンステッド塩基の中和反応で得られる[Phen][2HSO4]をシリカナノ粒子存在下で炭素化すると、[HSO4]が触媒として働き、細孔分布が狭いメソ孔(7~16 nm)を有する高比表面積なN含有炭素(1161 m2g-1)が得られる。この炭素は優れた酸素還元特性を示し、スーパーキャパシター用電極用の炭素材料として利用可能な事を明らかにした。

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/cssc.201403320/abstract

Hydrogen-bonding supramolecular protic salt as an “all-in-one” precursor for nitrogen-doped mesoporous carbons for CO2 adsorption

Shiguo Zhang, Toshihiko Mandai, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Nano Energy 13 376 - 386 2015年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER 共著

N含有炭素の原料としてブレンステッド酸とブレンステッド塩基の中和反応で得られる[pPDA][2HSO4]を用いると、[HSO4]が触媒として働き、カチオン構造が炭素源且つ鋳型として働くため、メソ孔、ミクロ孔を有する高比表面積なN含有炭素がワンステップで得られることを報告した。また、この多孔性炭素のCO2吸着効果を検討した。

その他リンク： http://www.sciencedirect.com/science/article/pii/S2211285515001020

Micelle structure of novel diblock polyethers in water and two protic ionic liquids (EAN and PAN)

Zhengfei Chen, Paul A FitzGerald, Yumi Kobayashi, Kazuhide Ueno, Masayoshi Watanabe, Gregory G Warr … 全著者表示

Macromolecules 48 ( 6 ) 1843 - 1851 2015年3月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

ポリエーテル系ブロック共重合体のイオン液体中における会合状態を水中の会合状態と比較するために、小角中性子散乱実験を行った。ポリマー鎖と媒体の水素結合的な相互作用の違いによってブロック共重合体の会合状態が異なることを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/acs.macromol.5b00082

Li+ solvation in glyme-Li salt solvate ionic liquids

Kazuhide Ueno, Ryoichi Tatara, Seiji Tsuzuki, Soshi Saito, Hiroyuki Doi, Kazuki Yoshida, Toshihiko … 全著者表示

Phys. Chem. Chem. Phys. 17 ( 12 ) 8248 - 8257 2015年2月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

様々なリチウム塩から成るグライムリチウム塩等モル錯体のラマンスペクトルを解析することにより、フリーなグライム量を見積もった。また、濃淡電池によりLi+の活量を調べることにより、フリーなグライム量を見積もることで、両方法の妥当性を検討した。また、高エネルギーX線回折実験より、溶媒和イオン液体中のバルク液体構造のに関する議論も行った。

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2015/cp/c4cp05943c#!divAbstract

Solvent activity in electrolyte solutions controls electrochemical reactions in Li-ion and Li-sulfur batteries

Heejoon Moon, Toshihiko Mandai, Ryoichi Tatara, Kazuhide Ueno, Azusa Yamazaki, Kazuki Yoshida, Shir … 全著者表示

J. Phys. Chem. C 119 ( 8 ) 3957 - 3970 2015年2月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

リチウム溶媒和イオン液体または配位子を過剰に含む電解液を任意の割合でハイドロフルオロエーテルで希釈した電解液を用いて、様々な電池系の電極反応が過剰な溶媒の活量に支配されていることを示した。Li+に配位していない配位子が無い系でリチウムイオン電池、リチウム硫黄電池が可逆的に作動する事を明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp5128578

Li+ ion transport in polymer electrolytes based on a glyme-Li salt solvate ionic liquid

Ryosuke Kido, Kazuhide Ueno, Kaori Iwata, Yuzo Kitazawa, Satoru Imaizumi, Toshihiko Mandai, Kaoru D … 全著者表示

Electrochim. Acta 175 5 - 12 2015年1月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD 共著

リチウム溶媒和イオン液体を一成分とした高分子電解質中のイオン輸送を調査するため、ポリメタクリル酸メチル、ポリアクリル酸ブチル、ポリエチレンオキシドと溶媒和イオン液体を混合した溶液の熱特性、イオン伝導性、イオンの自己拡散係数、電気化学特性について検討した。ポリメタクリル酸メチル、ポリアクリル酸ブチルをマトリックスとした系では錯カチオンが安定に存在しており、優れたイオン輸送特性を示すことを明らかにした。

その他リンク： http://www.sciencedirect.com/science/article/pii/S0013468615000870

Effect of ionic size on solvate stability of glyme-based solvate ionic liquids

Toshihiko Mandai, Kazuki Yoshida, Seiji Tsuzuki, Risa Nozawa, Hyuma Masu, Kazuhide Ueno, Kaoru Dokk … 全著者表示

J. Phys. Chem. B 119 ( 4 ) 1523 - 1534 2014年12月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

オリゴエーテル溶媒であるグライム鎖長を適切に制御した溶媒和イオン液体の相図、配位構造、電気化学的特性に関する中心アルカリ金属イオンの効果について検討した。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp508100s

Pentaglyme-K salt binary mixtures: phase behavior, solvate structures, and physicochemical properties

Toshihiko Mandai, Seiji Tsuzuki, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Phys. Chem. Chem. Phys. 17 ( 4 ) 2838 - 2849 2014年12月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

様々なK塩とペンタグライム(G5)から成る1:1錯体を調製し、その相図、熱特性、配位構造を詳しく調べることで[K(G5)]錯カチオンから成る溶媒和イオン液体の形成の可能性を検討した。また、溶融状態のイオン輸送特性、解離性を評価することで、アニオン構造によってgood solvate ionic liquidとpoor solvate ionic liquidに分けられることを明らかにした。

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2015/cp/c4cp05017g/unauth#!divAbstract

Upper limit of nitrogen content in carbon materials

Shiguo Zhang, Seiji Tsuzuki, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Angew. Chem. Int. Ed. 54 ( 4 ) 1302 - 1306 2014年11月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY 共著

N含有カーボン材料のN含有量について、その単位構造について様々な例を元に構造科学的に考察し、その最大含有量を見積もることが可能なことを報告した。

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/anie.201410234/abstract

Structures of [Li(glyme)]+ complexes and their interactions with anions in equimolar mixtures of glymes and Li[TFSA]: analysis by molecular dynamics simulations

Seiji Tsuzuki, Wataru Shinoda, Masaru Matsugami, Yasuhiro Umebayashi, Kazuhide Ueno, Toshihiko Mand … 全著者表示

Phys. Chem. Chem. Phys. 17 ( 1 ) 126 - 129 2014年11月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

[Li(glyme)][TFSA]錯体の構造とイオン輸送特性についてMDシミュレーションより検討した。トリグライムとテトラグライムを比較すると、酸素数が一つ少ないトリグライムではアニオンがLiカチオンの配位に寄与している割合が多いことを明らかにした。これはラマンスペクトルから得られる実験データと一致する結果であった。

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/c4cp04718d#!divAbstract

Nanostructure of [Li(G4)]TFSI and [Li(G4)]NO3 solvate ionic liquids at HOPG and Au(111) electrode interfaces as a function of potential

Ben McLean, Hua Li, Ryan Stefanovic, Ross J. Wood, Grant B. Webber, Kazuhide Ueno, Masayoshi Watana … 全著者表示

Phys. Chem. Chem. Phys. 17 ( 1 ) 325 - 333 2014年10月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

溶媒和イオン液体とHOPGおよびAu(111)界面に形成される構造をAFMによって調べた。またその電位依存性も検討した。溶媒和イオン液体はそれぞれの表面上で多層構造を形成することを明らかとした。また、それは錯カチオンが安定な[Li(G4]TFSIで顕著であった。

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C4CP04522J#!divAbstract

Enhanced performance of sulfone-based electrolytes at lithium ion battery electrodes, including the LiNi0.5Mn1.5O4 high voltage cathode

Leigang Xue, Kazuhide Ueno, Seung-Yul Lee, C. Austen Angell

J. Power Sources 262 123 - 128 2014年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER 共著

その他リンク： http://www.sciencedirect.com/science/article/pii/S0378775314004224

Gelation of solvate ionic liquid by self-assembly of block copolymer and characterization as polymer electrolyte

Yuzo Kitazawa, Kaori Iwata, Satoru Imaizumi, Hyungmin Ahn, Sung Yeon Kim, Kazuhide Ueno, Moon Jeong … 全著者表示

Macromolecules 47 ( 17 ) 6009 - 6016 2014年8月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

リチウム溶媒和イオン液体を固体電解質へと適用するためトリブロック共重合体と溶媒和イオン液体を混合することによってイオンゲルを調製した。また、ゲル中における錯イオンの配位構造、イオン輸送特性を調査した。溶媒和イオン液体構造を保ったままゲル化することに成功した。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/ma501296m

Mechanism of Li ion desolvation at the interface of graphite electrode and glyme-Li salt solvate ionic liquids

Heejoon Moon, Ryoichi Tatara, Toshihiko Mandai, Kazuhide Ueno, Kazuki Yoshida, Naoki Tachikawa, Tom … 全著者表示

J. Phys. Chem. C 118 ( 35 ) 20246 - 20256 2014年8月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

リチウム溶媒和イオン液体を電解液に用いると黒鉛電極への可逆的なLi+挿入脱離が起こることを見出した。この可逆的な反応が錯カチオン形成に関与していないフリーな溶媒の濃度に関係することを示した。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp506772f

Chelate effects in glyme/lithium bis(trifluoromethanesulfonyl)amide solvate ionic liquids, part 2: importance of solvate-structure stability for electrolytes of lithium batteries

Ce Zhang, Azusa Yamazaki, Junichi Murai, Jun-Woo Park, Toshihiko Mandai, Kazuhide Ueno, Kaoru Dokk … 全著者表示

J. Phys. Chem. C 118 ( 31 ) 17362 - 17373 2014年7月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

酸素原子数が異なるオリゴエーテル溶媒とLiTFSAから成る混合物をリチウムイオン電池、リチウム硫黄電池の電解液として評価し、錯カチオンの安定性の効果を検討した。安定な溶媒和イオン液体を形成する組合せで安定な電池特性を示すことを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp504099q

Physicochemical properties of pentaglyme-sodium bis(trifluoromethanesulfonyl)amide solvate ionic liquid

Shoshi Terada, Toshihiko Mandai, Risa Nozawa, Kazuki Yoshida, Kazuhide Ueno, Seiji Tsuzuki, Kaoru D … 全著者表示

Phys. Chem. Chem. Phys. 16 ( 23 ) 11737 - 11746 2014年4月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

NaTFSAとペンタグライム(G5)から成る溶媒和イオン液体[Na(G5)][TFSA]の熱安定性、イオン輸送特性、電気化学特性を調べた。さらに、[Na(G5)][TFSA]を電解液としてナトリウムイオン電池が作動する事を報告した。

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2014/cp/c4cp00746h#!divAbstract

Chelate effects in glyme/lithium bis(trifluoromethanesulfonyl)amide solvate ionic liquids, part 1: stability of solvate cations and correlation with electrolyte properties

Ce Zhang, Kazuhide Ueno, Azusa Yamazaki, Kazuki Yoshida, Toshihiko Mandai, Yasuhiro Umebayashi, Kao … 全著者表示

J. Phys. Chem. B 118 ( 19 ) 5144 - 5153 2014年4月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

溶媒和イオン液体の形成に関わる配位子構造の効果を調査するために、一分子内の酸素原子数が異なるオリゴエーテル溶媒とLiTFSAから成る混合物の錯イオンの安定性、イオン輸送特性について調べた。安定な溶媒和イオン液体を形成するためには酸素数3個以上の多座配位子が有用であることを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp501319e

Criteria for solvate ionic liquids

Toshihiko Mandai, Kazuki Yoshida, Kazuhide Ueno, Kaoru Dokko, Masayoshi Watanabe

Phys. Chem. Chem. Phys. 16 ( 19 ) 8761 - 8772 2014年3月 [査読有り] [招待有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY 共著

溶媒和イオン液体を定義するパラメータについて配位子の構造や対アニオン構造、更に溶媒和イオン液体の評価方法を纏めた総合論文である。その他、溶媒和イオン液体を形成する可能性のある組合せについても言及した。

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2014/cp/c4cp00461b#!divAbstract

Performance of sulfone, and sulfone-containing, solvents at lithium ion battery electrodes, including the LiNi0.5Mn1.5O4 high voltage cathode

Leigang Xue, Kazuhide Ueno, Seung-Yul Lee, and C. Austen Angell

Journal of Power Sources 262 123 - 128 2014年3月 [査読有り]

記述言語：英語掲載種別：研究論文（学術雑誌）共著

高電圧正極材料LiNi0.5Mn1.5O4を正極としたリチウムイオン電池の電解質にスルホン系電解液を用いて基礎的な電気化学測定及び電池試験を行った。

Solubility of poly(methyl methacrylate) in ionic liquids in relation to solvent parameters

Kazuhide Ueno, Toshimichi Fukai,Tomomi Nagatsuka, Tomohiro Yasuda, Masayoshi Watanabe

Langmuir 30 ( 11 ) 3228 - 3235 2014年2月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

ポリメタクリル酸メチルを修飾した単分散シリカ粒子の各種イオン液体中における流体力学的半径を動的光散乱で評価し、その値とイオン液体の各種パラメータとの関係性を調べた。これにより高分子の溶解性とイオン液体の溶媒パラメータの相関について検討した。ポリメタクリル酸メチルの溶解性はイオン液体の疎水的なパラメータに支配されることを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/la404797g

Phase diagrams and solvate structures of binary mixtures of glymes and Na salts

Toshihiko Mandai, Risa Nozawa, Seiji Tsuzuki, Kazuki Yoshida, Kazuhide Ueno, Kaoru Dokko, Masayoshi … 全著者表示

J. Phys. Chem. B 117 ( 48 ) 15072 - 15085 2013年11月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

様々なNa塩とオリゴエーテル系溶媒和であるグライムから成る溶融錯体の配位構造と熱特性を調査し、Na塩から成る溶媒和イオン液体の可能性を示した。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp407582m

Anionic effects on solvate ionic liquid electrolytes in rechargeable lithium-sulfur batteries

Kazuhide Ueno, Jun-Woo Park, Azusa Yamazaki, Toshihiko Mandai, Naoki Tachikawa, Kaoru Dokko, Masayo … 全著者表示

J. Phys. Chem. C 117 ( 40 ) 20509 - 20516 2013年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

リチウム硫黄電池に適した溶媒和イオン液体を探索するため、溶媒和イオン液体のアニオン構造とリチウム硫黄電池特性の関係について調べた。多硫化リチウムはルイス塩基性の低いアニオンから成る溶媒和イオン液体にのみ溶け難いことが分かった。また、BF4やNO3はリチウム硫黄電池中で副反応を起こすことを明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp407158y

Ionic liquid electrolytes for lithium-sulfur batteries

Jun-Woo Park, Kazuhide Ueno, Naoki Tachikawa, Kaoru Dokko, Masayoshi Watanabe

J. Phys. Chem. C 117 ( 40 ) 20531 - 20541 2013年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC 共著

非プロトン性イオン液体をリチウム硫黄電池の電解液とした場合のイオン構造とリチウム硫黄電池特性の関係性について調べた。多硫化リチウムはドナー性が大きなイオン液体に溶けやすいことを明らかにした。また、FSAアニオンはイオン輸送特性は高いが、多硫化リチウム存在下で副反応を起こすことを報告した。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp408037e

EQCM measurement of deposition and dissolution of lithium in glyme-Li salt molten complex

Nobuyuki Serizawa, Shiro Seki, Katsuhito Takei, Hajime Miyashiro, Kazuki Yoshida, Kazuhide Ueno, Na … 全著者表示

J. Electrochem. Soc. 160 ( 9 ) A1529 - A1533 2013年7月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELECTROCHEMICAL SOC INC 共著

リチウム溶媒和イオン液体を電解液とした場合のリチウム析出・溶解反応をEQCM測定により調べた論文である。電極界面近傍における脱溶媒和、溶媒和及び副反応に伴う粘性の変化を観測した。

その他リンク： http://jes.ecsdl.org/content/160/9/A1529.abstract

Solvate ionic liquid, [Li(triglyme)1][NTf2], as electrolyte for rechargeable Li/air battery: discharge depth and reversibility

Ryoichi Tatara, Naoki Tachikawa, Hoi-Min Kwon, Kazuhide Ueno, Kaoru Dokko and Masayoshi Watanabe

Chem. Lett. 42 ( 9 ) 1053 - 1055 2013年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN 共著

リチウム系溶媒和イオン液体である[Li(triglyme)1][NTf2]中における乾燥酸素の可逆的な還元反応、再酸化反応を報告した論文である。これにより溶媒和イオン液体がリチウム空気電池の電解液として可能であることを示した。

その他リンク： https://www.jstage.jst.go.jp/article/cl/42/9/42_130420/_article

Solvate ionic liquid electrolyte for Li–S batteries

Kaoru Dokko, Naoki Tachikawa, Kento Yamauchi, Mizuho Tsuchiya, Azusa Yamazaki, Eriko Takashima, Jun … 全著者表示

J. Electrochem. Soc. 160 ( 8 ) A1304 - A1310 2013年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELECTROCHEMICAL SOC INC 共著

リチウム硫黄電池の実用化に対する課題である多硫化リチウムの溶出が溶媒和イオン液体を用いることで克服できることを示した論文である。また、溶媒和イオン液体をハイドロフルオロエーテルで希釈した電解液を用いることで、リチウム硫黄電池の出力特性も向上することを明らかにした。

その他リンク： http://jes.ecsdl.org/content/160/8/A1304.abstract

Solvent effect of room-temperature ionic liquids on electrochemical reactions in lithium–sulfur batteries

Jun-Woo Park, Kento Yamauchi, Eriko Takashima, Naoki Tachikawa, Kazuhide Ueno, Kaoru Dokko, and Mas … 全著者表示

J. Phys. Chem. C 117 ( 9 ) 4431 - 4440 2013年2月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

リチウム硫黄電池の実用化に対する課題である多硫化リチウムの溶出を防ぐためには有機電解液よりもイオン液体が有用であることを多硫化リチウムの溶解度測定、硫黄電池評価から明らかにした。

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp400153m

Anhydrous superprotonic polymer by superacid protonation of crosslinked (PNCl2)n

Younes Ansari, Kazuhide Ueno, Zuofeng Zhao, C. Austen Angell

J. Phys. Chem. C 117 ( 4 ) 1548 - 1553 2012年12月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp306302n

Lithium salt solutions in mixed sulfone and sulfone-carbonate solvents: a Walden plot analysis of the maximally conductive compositions

Seung-Yul Lee, Kazuhide Ueno, C. Austen Angell

J. Phys. Chem. C 116 ( 45 ) 23915 - 23920 2012年10月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp3067519

Glyme-Li salt equimolar molten mixtures: concentrated solutions or solvate ionic liquids?

Kazuhide Ueno, Kazuki Yoshida, Mizuho Tsuchiya, Naoki Tachikawa, Kaoru Dokko, Masayoshi Watanabe

J. Phys. Chem. B 116 ( 36 ) 11323 - 11331 2012年8月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp307378j

Heat capacities and glass transitions of ion gels

Osamu Yamamuro, Takenori Someya, Maiko Kohu, Takeshi Ueki, Kazuhide Ueno, Masayoshi Watanabe

J. Phys. Chem. B 116 ( 35 ) 10935 - 10940 2012年8月 [査読有り]

DOI Web of Science PubMed

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp3030655

Microscopic insight into ion gel dynamics using neutron spesctroscopy

Maiko Kofu, Takenori Someya, Soichi Tatsumi, Kazuhide Ueno, Takeshi Ueki, Masayoshi Watanabe, Takur … 全著者表示

Soft Matter 8 3888 - 3897 2012年6月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.rsc.org/en/content/articlelanding/2012/SM/C2SM25348H#!divAbstract

Ionic liquids as oxidic media for electron transfer studies

Kazuhide Ueno, C. Austen Angell

J. Chem. Phys. 136 244501 2012年6月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://scitation.aip.org/content/aip/journal/jcp/136/24/10.1063/1.4729306

Protic ionic liquids based on decahydroisoquinoline: lost superfragility and fragility-ionicity correlation

Kazuhide Ueno , Zuofeng Zhao, Masayoshi Watanabe, C. Austen Angell

J. Phys. Chem. B 116 ( 1 ) 63 - 70 2011年11月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp2078727

High conductivity, and `dry' proton motion, in guanidinium salt melts and binary solutions

Zuofeng Zhao, Kazuhide Ueno, C. Austen Angell

J. Phys. Chem. B 115 ( 46 ) 13467 - 13472 2011年10月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp206491z

On the decoupling of relaxation modes in a molecular liquid caused by isothermal introduction of 2 nm structural inhomogeneities

Kazuhide Ueno , C. Austen Angell

J. Phys. Chem. B 115 ( 48 ) 13994 - 13999 2011年7月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp111398r

From colloidal stability in ionic liquid to advanced soft materials using the unique media

Kazuhide Ueno, Masayoshi Watanabe

Langmuir 27 ( 15 ) 9105 - 9115 2011年1月 [査読有り] [招待有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/la103942f

Thermosensitive, soft glassy and structural colored colloidal array in ionic liquid: colloidal glass to gel transition

Kazuhide Ueno, Aya Inaba, Takeshi Ueki, Masashi Kondoh, Masayoshi Watanabe

Langmuir 26 ( 23 ) 18031 - 18038 2010年10月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/la103716q

Soft glassy colloidal arrays in an ionic liquid: colloidal glass transition, ionic transport, and structural color in relation to microstructure

Kazuhide Ueno, Yuta Sano, Aya Inaba, Masashi Kondoh, Masayoshi Watanabe

J. Phys. Chem. B 114 ( 41 ) 13095 - 13103 2010年9月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp106872w

Resonance shear measurement of nanoconfined ionic liquids

Kazuhide Ueno, Motohiro Kasuya, Masayoshi Watanabe, Masashi Mizukami, Kazue Kurihara

Phys. Chem. Chem. Phys. 12 4066 - 4071 2010年3月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2010/CP/b923571j#!divAbstract

Ionicity in ionic liquids: correlation with ionic structure and physicochemical properties

Kazuhide Ueno, Hiroyuki Tokuda, Masayoshi Watanabe

Phys. Chem. Chem. Phys. 12 1649 - 1658 2010年1月 [査読有り] [招待有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/la901159r

Photoisomerization-induced tunable LCST phase separation of azobenzene-containing polymers in an ionic liquid

Takeshi Ueki, Ayuko Yamaguchi, Naoki Ito, Koichi Kodama, Junji Sakamoto, Kazuhide Ueno, Hisashi Kok … 全著者表示

Langmuir 25 ( 16 ) 8845 - 8848 2009年7月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

Thermosensitive self-assembly of diblock copolymers with lower critical micellization temperatures in an ionic liquid

Saki Tamura, Takeshi Ueki, Kazuhide Ueno, Koichi Kodama, Masayoshi Watanabe

Macromolecules 42 ( 16 ) 6239 - 6244 2009年6月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/ma900922d

Electrochromism based on structural colour changes in a polyelectrolyte gel

Kazuhide Ueno, Junji Sakamoto, Yukikazu Takeoka, Masayoshi Watanabe

J. Mater. Chem. 19 ( 27 ) 4778 - 4783 2009年5月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2009/JM/b900261h#!divAbstract

A soft glassy colloidal array in ionic liquid, which exhibits homogeneous, nonbrilliant, and angle-independent structural colours

Kazuhide Ueno, Aya Inaba, Yuta Sano, Masashi Kondoh, Masayoshi Watanabe

Chem. Commun. 24 3603 - 3605 2009年5月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.rsc.org/en/Content/ArticleLanding/2009/CC/b905108b#!divAbstract

Colloidal interaction in ionic liquids: effects of ionic structures and surface chemistry on rheology of silica colloidal dispersions

Kazuhide Ueno, Satoru Imaizumi, Kenji Hata, Masayoshi Watanabe

Langmuir 25 ( 2 ) 825 - 831 2008年12月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/la803124m

Nanocomposite ion gels based on silica nanoparticles and an ionic liquid: ionic transport, viscoelastic properties, and microstructure

Kazuhide Ueno, Kenji Hata, Toru Katakabe, Masashi Kondoh, Masayoshi Watanabe

J. Phys. Chem. B 112 ( 30 ) 9013 - 9019 2008年7月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/jp8029117

Colloidal stability of bare and polymer-grafted silica nanoparticles in ionic liquids

Kazuhide Ueno, Aya Inaba, Masashi Kondoh, Masayoshi Watanabe

Langmuir 24 ( 10 ) 5253 - 5259 2008年4月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://pubs.acs.org/doi/abs/10.1021/la704066v

An electro- and thermochromic hydrogel as a full-color indicator

Kazuhide Ueno, Kazuki Matsubara, Masayoshi Watanabe, Yukikazu Takeoka

Adv. Mater. 19 ( 19 ) 2807 - 2812 2007年9月 [査読有り]

DOI Web of Science

記述言語：英語掲載種別：研究論文（学術雑誌）共著

その他リンク： http://onlinelibrary.wiley.com/doi/10.1002/adma.200700159/abstract

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