Details of a Researcher - YABUUCHI Naoaki

Papers - YABUUCHI Naoaki

about 123

Design Strategy for Sheet-Type Composite Electrodes in All-Solid-State Batteries Operable Under Minimal Stack Pressure Enabled by Cold Isostatic Pressing

Teppei Ohno, Yosuke Ugata, and Naoaki Yabuuchi

ChemElectroChem 2026.3 [Reviewed] [Invited]

DOI

Language：English Publishing type：Research paper (scientific journal) Single Work

Efficient synthesis strategy of near-zero volume change materials for all-solid-state batteries operable under minimal stack pressure

Ohno, T; Ugata, Y; Yabuuchi, N

JOURNAL OF MATERIALS CHEMISTRY A 14 ( 1 ) 385 - 393 2026.1 [Reviewed]

DOI Web of Science Repository

Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry Joint Work

Lithium and oxygen dimer diffusion in solid-state oxygen-redox cathode materials: insights from neural network molecular dynamics

Sasadaira, T; Tanibata, N; Takeda, H; Yabuuchi, N; Nakayama, M

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS-METHODS 6 ( 1 ) 2025.12 [Reviewed]

DOI Web of Science

Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Joint Work

Direct Visualization of Metastable Charged States in Positive Electrode Materials by Cryo-STEM

Fujimura, H; Ugata, Y; Xinrui, Z; Miyazaki, Y; Yabuuchi, N

ACS MATERIALS LETTERS 7 ( 10 ) 3420 - 3426 2025.10 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Designing Functional Insertion Materials for Practical Battery Applications

YABUUCHI Naoaki

Electrochemistry advpub ( 0 ) 101003 - 101003 2025.10 [Reviewed]

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Single Work

Energy storage technology is indispensable, and Li-ion batteries are currently widely used as power sources for portable electronics and automobile applications. The Li-ion battery market for electric vehicles has expanded rapidly over the past decade. High-energy Ni-rich electrode materials, such as LiNi0.8Co0.1Mn0.1O2, and cost-effective Fe-based materials, such as LiFePO4, are commonly employed as positive electrode materials for electric vehicles. In this article, recent research progress and design strategies for positive electrode materials are summarized. Defect engineering has proven effective in enhancing electrode reversibility, enabling the development of high-performance, pure Ni-based layered materials. Furthermore, a Co-/Ni-free Mn-based Li insertion material with a domain structure and optimum surface area has been successfully synthesized. The electrode reversibility of cation-disordered rocksalt oxides containing V and Ti ions is also significantly improved through the structural defect enrichment and increased surface area. Highly concentrated electrolyte solutions, which possess high oxidation tolerance and reduced solubility for transition metal ions, further contribute to enhanced reversibility of these electrode materials. Similarly, the electrode reversibility of Mn-based Na insertion materials is greatly improved by using highly concentrated electrolyte solutions, due to the suppression of Mn dissolution. The practical feasibility of these Li/Na insertion materials is also discussed based on these findings.

Meta-aramid resin as functional binder and its applications for bipolar-type aqueous batteries

Zafar, S; Furuhata, S; Ugata, Y; Komagata, T; Yabuuchi, N

MATERIALS TODAY ENERGY 52 2025.8 [Reviewed] [Invited]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Na-Ion Battery Anodes Based on Biphenyl Carboxylate Derivatives

Takahashi, K; Yabuuchi, N; Miyasaka, M

ACS APPLIED ENERGY MATERIALS 8 ( 15 ) 11141 - 11148 2025.7 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Activation of Anionic Redox for Stoichiometric and Li-Excess Metal Sulfides through Structural Disordering: Joint Experimental and Theoretical Study

Shinoda Miyuki, Matsunoshita Koki, Nakayama Masanobu, Hiroi Satoshi, Ohara Koji, Abe Masaki, Ishigu … Show more authors

Journal of the American Chemical Society 147 ( 30 ) 26238 - 26253 2025.7 [Reviewed]

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work

Extensive research efforts have been dedicated to Li-excess compounds with anionic redox reaction as potential high-capacity positive electrode materials for Li-ion battery applications. The origin of activation on anionic redox is still under debate, and a unified understanding is necessary, especially for sulfide-based compounds without conductive d electrons. Herein, joint experimental and theoretical study is conducted for Li-excess and stoichiometric compounds with different crystal structures, cation-disordered rocksalt, and cation-ordered layered structures. In contrast to the understanding of Li-excess oxides, sulfide-based compounds with ordered layered structures are electrochemically less active compared with the materials with disordered structure. Theoretical study reveals that a unique local structure for a sulfide ion coordinated by 6 Li ions, SLi6 configuration, is formed, which can be found only for the disordered structure and not for the layered structure. The unique local structure triggers electron delocalization for sulfide 3p orbitals, leading to superior electronic conductivity, as experimentally evidenced, and thus anionic redox is successfully activated. Furthermore, such nonuniform local structures lead to easier structural distortion and efficient S–S dimerization, and even trimerization (S32–), upon delithiation. Although sulfide-based compounds as battery electrode materials suffer from dissolution after oxidation, this practical problem is effectively mitigated by the use of highly concentrated electrolyte solutions with fewer free solvent molecules, leading to superior reversibility for anionic redox. The insights derived can guide the development of high-energy electrode materials with anionic redox with or without transition metal ions possessing conductive d electrons.

Probing the semiconductor-Dirac-semimetal transition in Na-Sb-Bi alloys with x-ray Compton scattering

Pulkkinen, A; Kothalawala, VN; Suzuki, K; Barbiellini, B; Nokelainen, J; Chiu, WC; Singh, B; Lin, H … Show more authors

PHYSICAL REVIEW B 111 ( 23 ) 2025.6 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Designing Metastable P3-type Layered Negative Electrodes with High Na Vacancy Concentration for High-Power Sodium-Ion Batteries

Pandey, AK; Campéon, BDL; Zafar, S; Ishigaki, T; Koyama, T; Nakayama, M; Yabuuchi, N

ADVANCED FUNCTIONAL MATERIALS 35 ( 23 ) 2025.6 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Practical assessment of cobalt-free Li2MnO3-based layered materials for Li battery applications

Ugata, Y; Motoki, C; Handa, T; Yabuuchi, N

SOLID STATE IONICS 424 2025.6 [Reviewed] [Invited]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Mechanistic study on moisture exposure of Ti-based layered oxides for sodium storage applications

Campéon, BDL; Ishikawa, T; Tomohiro, K; Yabuuchi, N

JOURNAL OF MATERIALS CHEMISTRY A 13 ( 3 ) 2187 - 2197 2025.1 [Reviewed]

DOI Web of Science Repository

Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work

Efficient Pathways to Improve Electrode Performance of P'2 Na2/3MnO2 for Sodium Batteries

Early Access ( 2 ) 338 - 341 2024.11 [Reviewed]

DOI Web of Science PubMed CiNii Research Repository

Language：English Publishing type：Research paper (scientific journal) Joint Work

A Mn-based sodium-containing layered oxide, P'2-type Na2/3MnO2, is revisited as a positive electrode material for sodium-ion batteries, and factors affecting its electrochemical performances are examined. The cyclability of Na2/3MnO2 is remarkably improved by increasing the lower cut-off voltage during cycling even though the reversible capacity is sacrificed. Furthermore, the use of highly concentrated electrolytes, in which the presence of free solvent molecules is eliminated, effectively suppresses the dissolution of Mn ions, thus enabling stable cycling with >85% capacity retention for continuous 300 cycles.

MXene Electrodes for All Strain-Free Solid-State Batteries

Kawai, K; Lee, H; Nomura, Y; Fujita, M; Kitaura, H; Hosono, E; Nakajima, H; Tsukasaki, H; Mori, S; … Show more authors

ACS APPLIED MATERIALS & INTERFACES 16 ( 42 ) 57377 - 57385 2024.10

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Joint Work

A Practical and Sustainable Ni/Co-Free High-Energy Electrode Material: Nanostructured LiMnO2

10 ( 9 ) 1718 - 1732 2024.9

DOI Web of Science PubMed CiNii Research Repository

Language：English Publishing type：Research paper (scientific journal) Joint Work

Ni/Co-free high-energy positive electrode materials are of great importance to ensure the sustainability of Li-ion battery production and its supply chain in addition to minimizing environmental impact. Here, nanostructured LiMnO2 with both orthorhombic/monoclinic layered domains is synthesized, and its lithium storage properties and mechanism are examined. High-energy mechanical milling is used to convert the metastable and nanosized LiMnO2 adopting the cation-disordered rocksalt structure to an optimal domain-segregated layered LiMnO2. This positive electrode produces an energy density of 820 W h kg–1, achieved by harnessing a large reversible capacity with relatively small voltage hysteresis on electrochemical cycles. Moreover, voltage decay for cycling, as observed for Li-excess Mn-based electrode materials, is effectively mitigated. Furthermore, by determining the structure–property relationships of different LiMnO2 polymorphs, LiMnO2 with similar domain structure and surface area is successfully synthesized with an alternative and simpler method, without the metastable precursor and high-energy mechanical milling. The cyclability of domain-containing LiMnO2 is also improved with the use of a highly concentrated electrolyte coupled with a lithium phosphate coating due to the suppression of Mn dissolution. These findings maximize the possibility of the development of high-energy, low-cost, and practical rechargeable batteries made from sustainable and abundant Mn sources without Ni/Co.

Influence of Aluminum Substitution on Anionic Redox Activation and Stabilization in P′2-Type Na2/3MnO2 for Na/Li Battery Applications

Yin Jiaxuan, Zhang Yanjia, Kuriyama Tomohiro, Jin Yongcheng, Yabuuchi Naoaki

Chemistry of Materials 36 ( 18 ) 8682 - 8691 2024.9

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work

Lithium-ion batteries are now successfully developed with higher energy densities than classical aqueous-based battery technologies and are used as power sources for electric vehicles and other electric storage applications. Sodium-ion batteries are another emerging battery technology, but their energy density is not high compared to that of their Li counterparts. Anionic redox reactions have attracted attention due to their potential to enhance the reversible capacity and operating voltage of positive electrode materials in Na/Li batteries. To understand the influence of Al substitution on the activation mechanism of anionic redox reactions in Na-/Li-containing Mn-based layered oxides, the P2-type Al-substituted Na2/3Al0.1Mn0.9O2 is designed to explore the difference in the anionic redox behavior. LiyAl0.1Mn0.9O2 is also prepared by electrochemical ion exchange, and the anionic redox behavior was compared for both samples. The Al-substituted Na2/3Al0.1Mn0.9O2 provides better cycling performance with partial activation of anionic redox, which is not observed for P′2-type Na2/3MnO2. Good reversibility for Na2/3Al0.1Mn0.9O2 and LiyAl0.1Mn0.9O2 with anionic redox is achieved, and this improvement originates from the nonexcessive use of anionic redox in electrode materials. This finding opens the possibility to develop high-energy sodium/lithium insertion materials with reversible anionic redox.

Unlocking Electrode Performance of Disordered Rocksalt Oxides Through Structural Defect Engineering and Surface Stabilization with Concentrated Electrolyte

Zhang Yanjia, Ugata Yosuke, Campeon BenoitDenis Louis, Yabuuchi Naoaki

Advanced Energy Materials 14 ( 23 ) 2024.6

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley-VCH Verlag GmbH Joint Work

Li-excess cation-disordered rocksalt oxides can boost the energy density of rechargeable batteries by using anionic redox, but the inferior reversibility of anionic redox hinders its use for practical applications. Herein, a binary system of Li3NbO4-LiMnO2 is targeted and the systematic study on factors affecting electrode reversibility, i.e., percolation probability, electronic conductivity, defect concentrations, and electrolyte solutions, is conducted. A Mn-rich sample, Li1.1Nb0.1Mn0.8O2, delivers a smaller reversible capacity compared with a Li-rich sample, Li1.3Nb0.3Mn0.4O2, because of the limitation of ionic migration associated with insufficient percolation probability for disordered oxides. Nevertheless, a larger reversible capacity of Li1.3Nb0.3Mn0.4O2 originates from excessive activation of anionic redox, leading to the degradation of electrode reversibility. The superior performance of Li1.1Nb0.1Mn0.8O2, including Li ion migration kinetics and electronic transport properties, is unlocked by the enrichment of structural defects for nanosized oxides. Moreover, electrode reversibility is further improved by using a highly concentrated electrolyte solution with LiN(SO2F)(2) through the surface stabilization on high-voltage exposure. Superior capacity retention, >100 cycles, is achieved for nanosized Li1.1Nb0.1Mn0.8O2. The electrolyte decomposition and surface stabilization mechanisms are also carefully examined, and it is revealed that the use of highly concentrated electrolyte solution can effectively prevent lattice oxygen being further oxidized and transition metal ion dissolution.

State-of-the-art solid-state electrochemistry in Japan

Yabuuchi, N

JOURNAL OF SOLID STATE ELECTROCHEMISTRY 28 ( 12 ) 4353 - 4353 2024.6

DOI Web of Science

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

A methodology to synthesize easily oxidized materials containing Li ions in an inert atmosphere

Konuma, I; Ugata, Y; Yabuuchi, N

ENERGY ADVANCES 3 ( 5 ) 962 - 967 2024.5

DOI Web of Science Repository

Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work

A methodology to synthesize easily oxidized materials containing Li ions in an inert atmosphere

Konuma Itsuki, Ugata Yosuke, Yabuuchi Naoaki

Energy Advances 3 ( 5 ) 962 - 967 2024.5

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work

A series of lithium-containing oxides with V3+ and Mn3+ ions are proposed as emerging high-capacity positive electrode materials for lithium-ion batteries. These oxides are typically synthesized by a calcination process in an inert atmosphere. For the successful synthesis of these materials, the strict control of oxygen partial pressure is necessary to prevent partial oxidation of materials during calcination. In this article, a simple methodology used in laboratory-scale material production, i.e., an oxygen trap by Cu foil, is described to synthesize phase pure oxides, which are easily oxidized on calcination. To demonstrate the benefit of the methodology, Li8/7Ti2/7V4/7O2 and Li8/7Ti2/7Mn4/7O2 are selected as lithium-containing oxides with V3+ and Mn3+ ions, respectively. Single phase oxides are successfully obtained from the pellets calcined with Cu foil, whereas partially oxidized phases are obtained for the pellets calcined without Cu foil. Moreover, phase-pure oxides synthesized with Cu foil show much better performance as positive electrode materials for battery applications. This methodology is also expected to be applied for material synthesis for diverse applications. A simple methodology to synthesize easily oxidized materials with Mn3+ and V3+ ions, which are used as emerging high-capacity positive electrode materials for lithium-ion batteries, is proposed.

Unlocking Electrode Performance of Disordered Rocksalt Oxides Through Structural Defect Engineering and Surface Stabilization with Concentrated Electrolyte

Zhang, YJ; Ugata, Y; Campéon, BL; Yabuuchi, N

ADVANCED ENERGY MATERIALS 14 ( 23 ) 2024.4 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Fundamental methods of electrochemical characterization of Li insertion materials for battery researchers

Ugata Yosuke, Motoki Chihaya, Dokko Kaoru, Yabuuchi Naoaki

Journal of Solid State Electrochemistry 28 ( 3-4 ) 1387 - 1401 2024.3

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Joint Work

Li-ion batteries have gained intensive attention as a key technology for realizing a sustainable society without dependence on fossil fuels. To further increase the versatility of Li-ion batteries, considerable research efforts have been devoted to developing a new class of Li insertion materials, which can reversibly store Li-ions in host structures and are used for positive/negative electrode materials of Li-ion batteries. Appropriate evaluations of electrochemical properties of Li insertion materials are essential for the research of electrode materials in laboratory. In this article, we describe fundamental methods of electrochemical characterization of Li insertion materials including electrode preparation, cell assembly, and electrochemical measurement in the laboratory-scale research. The importance of selection for battery components such as electrolyte solutions, polymer binders, separators, and current collectors on the electrochemical properties of Li insertion materials, is also discussed. This article offers basic knowledge and techniques for electrochemical characterizations of Li insertion materials to students and beginners for battery research.

Fundamental methods of electrochemical characterization of Li insertion materials for battery researchers

Ugata, Y; Motoki, C; Dokko, K; Yabuuchi, N

JOURNAL OF SOLID STATE ELECTROCHEMISTRY 28 ( 3-4 ) 1387 - 1401 2024.3

DOI Web of Science

Language：The in addition, foreign language Publishing type：Research paper (scientific journal) Joint Work

Unified understanding and mitigation of detrimental phase transition in cobalt-free LiNiO2

Konuma Itsuki, Ikeda Naohiro, Campeon Benoit D. L., Fujimura Hinata, Kikkawa Jun, Luong Huu Duc, Ta … Show more authors

Energy Storage Materials 66 103200 2024.2

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Joint Work

Ni-enriched layered materials are used as electrode materials of Li -ion batteries for electric vehicle applications. Stoichiometric LiNiO2 with cationic Ni3+/Ni4+ redox is the ideal electrode material, but the gradual loss of capacity at the high voltage region, associated with Ni ion migration, hinders its use for practical applications. Therefore, to improve electrode reversibility of LiNiO2, less abundant Co ions and/or other electrochemically inactive ions, e.g., Al3+ ions, are in part substituted for Ni ions. Nevertheless, a unified understanding of improvement by metal substitution is as yet not established. In this study, the origin causing detrimental phase transition in LiNiO2 is discussed through the detailed analysis on LiNiO2 integrated with nanosized Li3PO4 derived from a metastable and rocksalt LiNiO2-Li3PO4 solid solution sample. LiNiO2 derived from the metastable rocksalt oxide has approximately 6 % anti -site defects, and the particle size growth is suppressed by uniformly dispersed nanosized Li3PO4. In low crystallinity LiNiO2 with partial structural disordering, the Ni ion migration to tetrahedral sites is effectively suppressed because of repulsive electrostatic interaction from Ni ions in Li layers. Moreover, from these findings, non-stoichiometric Li0.975Ni1.025O2 with smaller particle size has been directly synthesized without high-energy milling and Li3PO4 integration, and significant improvement of electrode reversibility is achieved. Electrode reversibility of non-stoichiometric Li0.975Ni1.025O2 is further improved through surface stabilization in a highly concentrated electrolyte solution. The unified understanding of deterioration mechanisms for LiNiO2 offers a new criterion to design Co -free LiNiO2 without metal substitution, leading to full utilization of a reversible capacity for layered materials.

Virtues of Cold Isostatic Pressing for Preparation of All-Solid-State-Batteries with Poly(Ethylene Oxide)

17 ( 3 ) 2024.2

DOI Web of Science PubMed CiNii Research

Language：English Publishing type：Research paper (scientific journal) Joint Work

Efficient Surface Passivation of Ti-Based Layered Materials by a Nonfluorine Branched Copolymer for Durable and High-Power Sodium-Ion Batteries

Campéon, BDL; Umezawa, R; Pandey, AK; Ishikawa, T; Tsuchiya, Y; Ishigaki, Y; Kanto, R; Yabuuchi, N

ACS APPLIED MATERIALS & INTERFACES 16 ( 3 ) 3396 - 3405 2024.1 [Reviewed]

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Joint Work

正極材料の未来展望

藪内直明

関西電気化学テキストシリーズ 2023.2 ( 0 ) 02009 - 02009 2023.10

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人電気化学会関西支部 Single Work

電気自動車用リチウムイオン蓄電池の正極材料としてニッケルリッチの材料が利用されているが，リチウムイオン電池のさらなるエネルギー密度の向上には正極材料の進化が不可欠である．本発表では，高性能ニッケル系層状材料，高エネルギー密度・低コストマンガン系材料，全固体電池用のバナジウム系材料などの研究成果について，これら材料の電池特性に加え，材料合成手法や充放電反応機構について紹介し，電池特性劣化機構の詳細解析とその抑制の実現可能性について議論を行う．

New functionality of electrode materials with highly concentrated electrolytes

Yosuke Ugata, Naoaki Yabuuchi

Trends in Chemistry 5 ( 9 ) 672 - 683 2023.9 [Reviewed]

DOI Web of Science CiNii Research

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Cell Press Joint Work

The use of Li-excess metal oxides as positive electrodes coupled with metallic Li-negative electrodes is regarded as a promising route toward achieving higher energy density for Li-ion batteries. However, the reversibility and cycle life of these electrode materials in conventional carbonate-based electrolyte solutions containing lithium salts at about 1 mol dm-3 often are still not an acceptable level for practical applications. Recently, as an important trend for electrolyte design, highly concentrated electrolytes (HCEs) have received much attention owing to new and emerging functionality through their superior compatibility with these advanced electrode materials. These new functionalities of electrode materials coupled with the use of HCEs and their mechanistic insights are reviewed.

Durable Manganese-Based Li-Excess Electrode Material without Voltage Decay: Metastable and Nanosized Li2MnO1.5F1.5

8 ( 6 ) 2753 - 2761 2023.6

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Joint Work

Anion-Induced Interfacial Liquid Layers on LiCoO2 in Salt-in-Water Lithium-Ion Batteries

Oh Hyunjeong, Shin Seung-Jae, Choi Eunjin, Yamagishi Hirona, Ohta Toshiaki, Yabuuchi Naoaki, Jung H … Show more authors

JACS Au 3 ( 5 ) 1392 - 1402 2023.5

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work

The incompatibility of lithium intercalation electrodes with water has impeded the development of aqueous Li-ion batteries. The key challenge is protons which are generated by water dissociation and deform the electrode structures through intercalation. Distinct from previous approaches utilizing large amounts of electrolyte salts or artificial solid-protective films, we developed liquid-phase protective layers on LiCoO2 (LCO) using a moderate concentration of 0.5 similar to 3 mol kg-1 lithium sulfate. Sulfate ion strengthened the hydrogen-bond network and easily formed ion pairs with Li+, showing strong kosmotropic and hard base characteristics. Our quantum mechanics/molecular mechanics (QM/MM) simulations revealed that sulfate ion paired with Li+ helped stabilize the LCO surface and reduced the density of free water in the interface region below the point of zero charge (PZC) potential. In addition, in situ electrochemical surface-enhanced infrared absorption spectroscopy (SEIRAS) proved the appearance of inner-sphere sulfate complexes above the PZC potential, serving as the protective layers of LCO. The role of anions in stabilizing LCO was correlated with kosmotropic strength (sulfate > nitrate > perchlorate > bistriflimide (TFSI-)) and explained better galvanostatic cyclability in LCO cells.

Nonflammable Fluorinated Ester-Based Electrolytes for Safe and High-Energy Batteries with LiCoO2

35 ( 9 ) 3686 - 3693 2023.5

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Joint Work

Anion-Induced Interfacial Liquid Layers on LiCoO2 in Salt-in-Water Lithium-Ion Batteries

Oh Hyunjeong, Shin Seung-Jae, Choi Eunjin, Yamagishi Hirona, Ohta Toshiaki, Yabuuchi Naoaki, Jung H … Show more authors

JACS AU 3 ( 5 ) 1392 - 1402 2023.4 [Reviewed]

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Joint Work

Improved reversibility of lithium deposition and stripping with high areal capacity under practical conditions through enhanced wettability of the polyolefin separator to highly concentrated electrolytes

Ugata Yosuke, Motoki Chihaya, Nishikawa Satoshi, Yabuuchi Naoaki

Energy Advances 2 ( 4 ) 503 - 507 2023.4

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：The Royal Society of Chemistry Joint Work

Highly concentrated electrolytes (HCEs) have attracted great interest as electrolyte candidates for Li metal batteries because of their functionalities in improving the reversibility and cycling performance of the Li metal negative electrode. However, the poor wettability of conventional polyolefin separators toward HCEs with high viscosity remains a critical issue to be addressed. Although porous glass fiber filters are often used as separators for HCEs, Li dendrites easily penetrate the separator during repeated Li deposition/stripping under practical conditions, leading to an internal short circuit. Here, we report that the use of a meta-aramid-coated polyolefin separator improves the wettability with HCEs owing to its polar surface functional groups and enables stable and dendrite-free Li deposition/stripping with high coulombic efficiency of similar to 98% at practical areal capacity (2 mA h cm-2) for 100 cycles. A combined strategy utilizing HCEs and functional separators provides a promising possibility for the development of practical Li metal batteries. Highly concentrated electrolytes (HCEs) have attracted great interest as electrolyte candidates for Li metal batteries because of their functionalities in improving the reversibility and cycling performance of the Li metal negative electrode.

Improved Electrode Reversibility of Nanosized Li1.15Nb0.15Mn0.7O2 through Li3PO4 Integration

Electrochemistry 91 ( 3 ) 037004 2023.3 [Reviewed]

DOI CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：The Electrochemical Society of Japan Joint Work

Improved electrode reversibility of anionic redox with highly concentrated electrolyte solution and aramid-coated polyolefin separator

Nanaka Shimada, Yosuke Ugata, Satoshi Nishikawa, Daisuke Shibata, Toshiaki Ohta, Naoaki Yabuuchi

Energy Advances 2 ( 4 ) 508 - 512 2023.3 [Reviewed]

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Single Work

Partially Reversible Anionic Redox for Lithium-Excess Cobalt Oxides with Cation-Disordered Rocksalt Structure

Zhang Yanjia, Sawamura Miho, Harada Maho, Noda Yusuke, Nakayama Masanobu, Goto Masato, Kan Daisuke, … Show more authors

Journal of Physical Chemistry C 127 ( 5 ) 2194 - 2203 2023.2

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society Joint Work

Li-excess electrode materials potentially boost the energy density of Li-ion batteries, but the origin of the instability of anionic redox in cation-disordered rocksalt material is still under debate. In this study, a binary system of Li3NbO4-CoO is targeted as electrode materials for lithium storage applications. In this binary system, stoichiometric LiCo2/3Nb1/3O2 crystallizes into a rocksalt-type structure with partial ordering of Nb ions. Upon increase of the Li3NbO4 fraction, cation ordering is lost, forming a cation-disordered rocksalt structure in Li-excess phases. Although Li-excess Li4/3Co2/9Nb4/9O2 delivers a large reversible capacity as electrode materials, inferior cyclability and large voltage hysteresis for charge/discharge curves are noted. Irreversible structural changes in electrochemical cycles are also evidenced from results of in situ XRD measurements, suggesting that anionic redox is destabilized for Li4/3Co2/9Nb4/9O2. X-ray absorption spectroscopy reveals that partial stabilization of ligand holes as observed in SrCoO3 is achieved for these oxides. Ligand holes are more effectively stabilized for Li7/6Co4/9Nb7/18O2 with less Li-excess and Co-rich composition. Through systematic study of the binary system of Li3NbO4-CoO with different chemical compositions, factors affecting reversibility and irreversibility of anionic redox are further discussed.

Nanoscale domain imaging of Li-rich disordered rocksalt-type cathode materials with X-ray spectroscopic ptychography

25 ( 5 ) 3867 - 3874 2023.2 [Reviewed]

DOI Web of Science PubMed CiNii Research

Language：English Publishing type：Research paper (scientific journal) Joint Work

Partially Reversible Anionic Redox for Lithium-Excess Cobalt Oxides with Cation-Disordered Rocksalt Structure

Yanjia Zhang, Miho Sawamura, Maho Harada, Yusuke Noda, Masanobu Nakayama, Masato Goto, Daisuke Kan, … Show more authors

The Journal of Physical Chemistry C 127 ( 5 ) 2194 - 2203 2023.1 [Reviewed]

DOI Web of Science

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Single Work

P3-type layered K0.6Cr0.6Ti0.4O2 for potassium storage applications

2 ( 1 ) 98 - 102 2023.1

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Joint Work

A near dimensionally invariable high-capacity positive electrode material

Itsuki Konuma, Damian Goonetilleke, Neeraj Sharma, Takuhiro Miyuki, Satoshi Hiroi, Koji Ohara, Yuki … Show more authors

Nature Materials 22 ( 2 ) 225 - 234 2022.12 [Reviewed]

DOI Web of Science PubMed CiNii Research

Language：English Publishing type：Research paper (scientific journal) Single Work

Extended conjugated carbonyl-containing polymer as a negative electrode material for Na-ion batteries

Sugawara Kazuki, Yabuuchi Naoaki, Miyasaka Makoto

POLYMER JOURNAL 54 ( 9 ) 1111 - 1118 2022.9 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Unexpectedly Large Contribution of Oxygen to Charge Compensation Triggered by Structural Disordering: Detailed Experimental and Theoretical Study on a Li₃NbO₄–NiO Binary System

福間隆太朗, 原田真帆, 趙文文, 澤村美穂, 野田祐輔, 中山将伸, 後藤真人, 菅大介, 島川祐一, 米村雅雄, 池田直宏, 綿貫竜太, 福山小百合, 韓貞姫, 福満 … Show more authors

ACS Central Science 8 ( 6 ) 775 - 794 2022.6 [Reviewed]

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS) Joint Work

Dependence on lithium-ion batteries for automobile applications is rapidly increasing. The emerging use of anionic redox can boost the energy density of batteries, but the fundamental origin of anionic redox is still under debate. Moreover, to realize anionic redox, many reported electrode materials rely on manganese ions through π-type interactions with oxygen. Here, through a systematic experimental and theoretical study on a binary system of Li₃NbO₄–NiO, we demonstrate for the first time the unexpectedly large contribution of oxygen to charge compensation for electrochemical oxidation in Ni-based materials. In general, for Ni-based materials, e.g., LiNiO₂, charge compensation is achieved mainly by Ni oxidation, with a lower contribution from oxygen. In contrast, for Li₃NbO₄–NiO, oxygen-based charge compensation is triggered by structural disordering and σ-type interactions with nickel ions, which are associated with a unique environment for oxygen, i.e., a linear Ni–O–Ni configuration in the disordered system. Reversible anionic redox with a small hysteretic behavior was achieved for LiNi₂/₃Nb₁/₃O₂ with a cation-disordered Li/Ni arrangement. Further Li enrichment in the structure destabilizes anionic redox and leads to irreversible oxygen loss due to the disappearance of the linear Ni–O–Ni configuration and the formation of unstable Ni ions with high oxidation states. On the basis of these results, we discuss the possibility of using σ-type interactions for anionic redox to design advanced electrode materials for high-energy lithium-ion batteries.

Metastable and Nanosized Li1.2Nb0.2V0.6O2 for High-Energy Li-ion Batteries

QI Ruijie, CAMPÉON Benoît D. L., KONUMA Itsuki, SATO Yoshihiko, KANEDA Yuko, KONDO Masashi, YABUUCH … Show more authors

Electrochemistry 90 ( 3 ) 037005 - 037005 2022.3 [Reviewed]

DOI Web of Science CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人　電気化学会 Joint Work

A Li-excess cation-disordered rocksalt oxide, Li1.2Nb0.2V0.6O2, with higher theoretical capacity than traditional stoichiometric and layered oxides, is synthesized and tested as positive electrode materials for battery applications. Although Li1.2Nb0.2V0.6O2 cannot be synthesized by conventional calcination method, a single phase and metastable oxide is successfully synthesized by high-energy mechanical milling. Electrode performance of metastable and nanosized Li1.2Nb0.2V0.6O2 is significantly improved by heat treatment at 600 °C. Heat treated Li1.2Nb0.2V0.6O2 with a partial cation ordered layered structure delivers a high reversible specific capacity of 320 mAh g−1 on the basis of highly reversible two-electron redox of V ions. Moreover, inferior cyclability originating from the dissolution of V ions is successfully improved by using concentrate electrolyte solution, and over 90 % capacity retention is achieved after 50 cycles. This finding opens a new way to design high-capacity metastable Li-excess oxides for advanced Li-ion batteries with higher energy density.

Rational material design of Li-excess metal oxides with disordered rock salt structure

Naoaki Yabuuchi

Current Opinion in Electrochemistry 34 100978 2022.3 [Reviewed] [Invited]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Single Work

Magnetic Compton Scattering Study of Li-Rich Battery Materials

Kosuke Suzuki, Yuji Otsuka, Kazushi Hoshi, Hiroshi Sakurai, Naruki Tsuji, Kentaro Yamamoto, Naoaki … Show more authors

Condensed Matter 7 ( 1 ) 4 2022.3 [Reviewed]

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Language：English Publishing type：Research paper (scientific journal) Joint Work

Rocksalt and Layered Metal Sulfides for Li Storage Applications: LiMe0.5Ti0.5S2 (Me = Fe2+, Mn2+, and Mg2+)

Miyuki Shinoda, Hongahally Basappa Rajendra, Naoaki Yabuuchi

ACS Applied Energy Materials 5 ( 3 ) 2642 - 2646 2022.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Highly Graphitic Carbon Coating on Li1.25Nb0.25V0.5O2 Derived from a Precursor with a Perylene Core for High-Power Battery Applications

Ruijie Qi, Itsuki Konuma, Benoît D. L. Campéon, Yuko Kaneda, Masashi Kondo, Naoaki Yabuuchi

Chemistry of materials 34 ( 4 ) 1946 - 1955 2022.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nanosized and metastable molybdenum oxides as negative electrode materials for durable high-energy aqueous Li-ion batteries

Yun Jeongsik, Sagehashi Ryota, Sato Yoshihiko, Masuda Takuya, Hoshino Satoshi, Rajendra Hongahally … Show more authors

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 118 ( 48 ) 2021.11 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Nanosized and metastable molybdenum oxides as negative electrode materials for durable high-energy aqueous Li-ion batteries

Yun Jeongsik, Sagehashi Ryota, Sato Yoshihiko, Masuda Takuya, Hoshino Satoshi, Rajendra Hongahally … Show more authors

Proceedings of the National Academy of Sciences of the United States of America 118 ( 48 ) 2021.11

CiNii Research

Language：English Publishing type：Research paper (scientific journal) Publisher：National Academy of Sciences Joint Work

The development of inherently safe energy devices is a key challenge, and aqueous Li-ion batteries draw large attention for this purpose. Due to the narrow electrochemical stable potential window of aqueous electrolytes, the energy density and the selection of negative electrode materials are significantly limited. For achieving durable and high-energy aqueous Li-ion batteries, the development of negative electrode materials exhibiting a large capacity and low potential without triggering decomposition of water is crucial. Herein, a type of a negative electrode material (i.e., LixNb2/7Mo3/7O2) is proposed for high-energy aqueous Li-ion batteries. LixNb2/7Mo3/7O2 delivers a large capacity of similar to 170 mA . h . g(-1) with a low operating potential range of 1.9 to 2.8 versus Li/Li+ in 21 m lithium bis(trifluoromethanesulfonyl)amide (LiTFSA) aqueous electrolyte. A full cell consisting of Li1.05Mn1.95O4/Li9/7Nb2/7Mo3/7O2 presents high energy density of 107 W . h . kg(-1) as the maximum value in 21 m LiTFSA aqueous electrolyte, and 73% in capacity retention is achieved after 2,000 cycles. Furthermore, hard X-ray photoelectron spectroscopy study reveals that a protective surface layer is formed at the surface of the negative electrode, by which the high-energy and durable aqueous batteries are realized with LixNb2/7Mo3/7O2. This work combines a high capacity with a safe negative electrode material through delivering the Mo-based oxide with unique nanosized and metastable characters.

Fundamentals of metal oxide/oxyfluoride electrodes for Li-/Na-ion batteries

Benoît Denis Louis Campéon and Naoaki Yabuuchi

Chemical Physics Reviews 2 ( 4 ) 041306 2021.11 [Reviewed] [Invited]

DOI Web of Science CiNii Research

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：AIP Publishing Single Work

Lithium-ion batteries provide the development of a clean and sustainable society based on renewable energy resources. To further enhance energy density and reduce the cost of batteries, innovations on electrode materials and high-performance nickel-/cobalt-free materials are necessary. In this review, lithium-excess manganese-based electrode materials with layered/rock salt oxides/oxyfluorides are emphasized because of their potential ability to be utilized as advanced and low-cost lithium-ion batteries in the near future. For these emerging electrode materials, higher energy density is realized, compared with traditional layered materials based on nickel/cobalt ions, relying on anionic and/or cationic redox as multi-electron reactions. Although, currently, anionic redox suffers from degradation of reversibility on continuous cycles, significant progress on theoretical understanding and material design concepts has been made in the past several years. Recently, as alternatives to traditional layered materials, many disordered rock salt oxides, including metastable and nanosized oxyfluorides, have been also found as a new class of high-capacity electrode materials with anionic/cationic redox. In the later part, these new trends for the material design are also extended to the development of electrode materials for sodium-ion batteries. By reviewing the fundamental and recent research progress in metal oxide/oxyfluoride electrodes, a valuable guide for materials scientists in the field of batteries is provided to accelerate the industrial development of high-performance nickel-/cobalt-free electrode materials. (c) 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Why is the O3 to O1 phase transition hindered in LiNiO2 on full delithiation?

Ikeda Naohiro, Konuma Itsuki, Rajendra Hongahally Basappa, Aida Taira, Yabuuchi Naoaki

JOURNAL OF MATERIALS CHEMISTRY A 9 ( 29 ) 15963 - 15967 2021.8 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Tomographic reconstruction of oxygen orbitals in lithium-rich battery materials

Hafiz Hasnain, Suzuki Kosuke, Barbiellini Bernardo, Tsuji Naruki, Yabuuchi Naoaki, Yamamoto Kentaro … Show more authors

NATURE 594 ( 7862 ) 213 - 216 2021.6 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O3-Type NaMnO2

Takuro Sato, Kazuki Yoshikawa, Wenwen Zhao, Tokio Kobayashi, Hongahally Basappa Rajendra, Masao Yon … Show more authors

Energy Material Advances 2021 9857563-1 - 9857563-12 2021.5 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

P2-type layered Na0.67Cr0.33Mg0.17Ti0.5O2 for Na storage applications

Raizo Umezawa, Yuka Tsuchiya, Toru Ishigaki, Hongahally Basappa Rajendra, Naoaki Yabuuchi

Chemical Communications 57 ( 22 ) 2756 - 2759 2021.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O ' 3-Type NaMnO2

Sato Takuro, Yoshikawa Kazuki, Zhao Wenwen, Kobayashi Tokio, Rajendra Hongahally Basappa, Yonemura … Show more authors

ENERGY MATERIAL ADVANCES 2021 2021

DOI Web of Science

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Efficient Stabilization of Na Storage Reversibility by Ti Integration into O ' 3-Type NaMnO2 (vol 2021, 9857563, 2021)

Sato Takuro, Yoshikawa Kazuki, Zhao Wenwen, Kobayashi Tokio, Rajendra Hongahally Basappa, Yonemura … Show more authors

ENERGY MATERIAL ADVANCES 2021 2021

DOI Web of Science

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Nanostructured LiMnO2 with Li3PO4 Integrated at the Atomic Scale for High-Energy Electrode Materials with Reversible Anionic Redox

Miho Sawamura, Sho Kobayakawa, Jun Kikkawa, Neeraj Sharma, Damian Goonetilleke, Aditya Rawal, Nanak … Show more authors

ACS Central Science 6 ( 12 ) 2326 - 2338 2020.12 [Reviewed]

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Language：English Publishing type：Research paper (scientific journal) Joint Work

アニオンによる電荷補償を利用する高容量正極材料の開発

藪内直明

関西電気化学テキストシリーズ 2020.1 ( 0 ) 101 - 114 2020.11

DOI CiNii Research

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人電気化学会関西支部 Single Work

Tuning cation migration

Yabuuchi Naoaki

NATURE MATERIALS 19 ( 4 ) 372 - 373 2020.4

DOI Web of Science

Language：Japanese Publishing type：Research paper (scientific journal) Single Work

Activation and stabilization mechanisms of anionic redox for Li storage applications: Joint experimental and theoretical study on Li2TiO3–LiMnO2 binary system

Yuki Kobayashi, Miho Sawamura, Sayaka Kondo, Maho Harada, Yusuke Noda, Masanobu Nakayama, Sho Kobay … Show more authors

Materials Today 37 43 - 55 2020.3 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Joint Work

Structural Analysis of Sucrose-Derived Hard Carbon and Correlation with the Electrochemical Properties for Lithium, Sodium, and Potassium Insertion

Kei Kubota, Saori Shimadzu, Naoaki Yabuuchi, Satoshi Tominaka, Soshi Shiraishi, Maria Abreu-Sepulve … Show more authors

Chemistry of Materials 32 ( 7 ) 2961 - 2977 2020.3 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Charge Compensation Mechanism of Lithium-Excess Metal Oxides with Different Covalent and Ionic Characters Revealed by Operando Soft and Hard X-ray Absorption Spectroscopy

Yamamoto Kentaro, Zhou Yingying, Yabuuchi Naoaki, Nakanishi Koji, Yoshinari Takahiro, Kobayashi Tak … Show more authors

CHEMISTRY OF MATERIALS 32 ( 1 ) 139 - 147 2020.1 [Reviewed]

DOI Web of Science

Language：Japanese Publishing type：Research paper (scientific journal) Joint Work

Material Design Concept of Lithium‐Excess Electrode Materials with Rocksalt‐Related Structures for Rechargeable Non‐Aqueous Batteries

Naoaki Yabuuchi

The Chemical Record Vol.19 ( 4 ) 2019.10 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Online Library Single Work

Other Link： https://doi.org/10.1002/tcr.201800089

Nanosize Cation‐Disordered Rocksalt Oxides: Na2TiO3–NaMnO2 Binary System

Tokio Kobayashi, Wenwen Zhao, Hongahally Basappa Rajendra, Keisuke Yamanaka, Toshiaki Ohta, N … Show more authors

SmallEarly View 16 1902462 - 6 pages 2019.9 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley Online Library Joint Work

Other Link： https://doi.org/10.1002/smll.201902462

Li/Na Storage Properties of Disordered Carbons Synthesized by Mechanical Milling

Soma SHIMIZU, Hongahally Basappa RAJENDRA, Ryuta WATANUKI, Naoaki YABUUCHI

Electrochemistry Vol.87 ( 5 ) 276 - 280 2019.7 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Publisher：J-STAGE Single Work

Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542

Other Link： https://doi.org/10.5796/electrochemistry.19-00029

Improved Electrode Performance of Lithium-Excess Molybdenum Oxyfluoride: Titanium Substitution with Concentrated Electrolyte

N Takeda, I Ikeuchi, R Natsui, K Nakura, N yabuuchi

ACS Appl. Energy Mater 2 ( 3 ) 1629 - 1633 2019.2 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Metastable and Nanosize Cation-Disordered Rocksalt-type Oxides; Revisit on Stoichiometric LiMnO2 and NaMnO2

Takahito Sato, Kei Sato, Wenwen Zhao, Yoshio Kajiya and Naoaki Yabuuchi

Journal of Materials Chemistry A 6 ( 28 ) 13943–13951 2018.6 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY Joint Work

Li4/3Ni1/3Mo1/3O2-LiNi1/2Mn1/2O2 Binary System as High Capacity Positive Electrode Materials for Rechargeable Lithium Batteries

Wenwen Zhao, Kazuma Yamaguchi, Takahito Sato, and Naoaki Yabuuchi

Journal of The Electrochemical Society 165 ( 7 ) A1357 - A1362 2018.5

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC INC Joint Work

Effect of diphenylethane as an electrolyte additive to enhance hightemperature durability of LiCoO2/graphite cells

Kakeru Yatabe, Tatsuo Horiba, Kei Kubota, Mika Fukunishi, Naoaki Yabuuchi, Hiroshi Oji, Jin-Yong So … Show more authors

Electrochimica Acta 270 120 - 128 2018.4

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Influence of synthesis conditions on electrochemical properties of P2-type Na2/3Fe2/3Mn1/3O2 for rechargeable Na batteries

Wenwen Zhao, Yuka Tsuchiya, and Naoaki Yabuuchi

Small Methods 2 1800032 2018.4 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Synthesis of Conjugated Carbonyl Containing Polymer Negative Electrodes for Sodium Ion Batteries

Ryosuke Yamamoto, Naoaki Yabuuchi, and Makoto Miyasaka

Journal of The Electrochemical Society 165 434 - 438 2018.2 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELECTROCHEMICAL SOC INC Joint Work

Effect of Nanosizing on Reversible Sodium Storage in a NaCrO2 Electrode

Yuka Tsuchiya, Alexey M. Glushenkov, and Naoaki Yabuuchi

ACS Applied Nano Materials 1 364 - 370 2018.1 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Material Design Concept of Lithium‐Excess Electrode Materials with Rocksalt‐Related Structures for Rechargeable Non‐Aqueous Batteries

Naoaki Yabuuchi

The Chemical Record 19 ( 4 ) 2018 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Single Work

Reversible Li storage for nanosize cation/anion-disordered rocksalt-type LiMoO2-x LiFoxyfluorides (0 <- x <- 2) binary system

Nanami Takeda, Satoshi Hoshino, Lixin Xie, Shuo Chen, Issei Ikeuchi, Ryuichi Natsui, Kensuke Nakura … Show more authors

Journal of Power Sources 367 122 - 129 2017.11 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

High performance red phosphorus electrode in ionic liquid-based electrolyte for Na-ion batteries

Mouad Dahbi, Mika Fukunishi, Tatsuo Horiba, Naoaki Yabuuchi, Satoshi Yasuno, Shinichi Komaba

Journal of Power Sources 363 404 - 412 2017.9 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

Acrylonitrile-grafted poly(vinyl alcohol) copolymer as effective binder for high-voltage spinel positive electrode

Shinichi Tanaka, Takuya Narutomi, Shigeru Suzuki, Aiko Nakao, Hiroshi Oji, and Naoaki Yabuuchi

Journal of Power Sources 358 121 - 127 2017.8 [Reviewed]

DOI Web of Science

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER Joint Work

All-Solid-State Ion-Selective Electrodes with Redox-Active Lithium, Sodium, and Potassium Insertion Materials as Inner Solid-Contact Layer

Shinichi Komaba, Tatsuya Akatsuka, Kohei Ohura, Chihiro Suzuki, Naoaki Yabuuchi, Shintaro Kanazawa, … Show more authors

Analyst 142 ( 20 ) 3857 - 3866 2017.8 [Reviewed]

DOI Web of Science PubMed

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY Joint Work

Lithium-Excess Cation-Disordered Rocksalt-Type Oxide with Nano-Scale Phase Segregation: Li1.25Nb0.25V0.5O2

Mizuki Nakajima and Naoaki Yabuuchi

Chemistry of Materials 29 6927 - 6935 2017.8 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Na-Excess Cation-Disordered Rocksalt Oxide: Na1.3Nb0.3Mn0.4O2

Kei Sato, Masanobu Nakayama, Alexey M. Glushenkov, Takahiro Mukai, Yu Hashimoto, Keisuke Yamanaka, … Show more authors

Chemistry of Materials 29 5043 - 5047 2017.6 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Solid-State Redox Reaction of Oxide Ions for Rechargeable Batteries

Naoaki Yabuuchi

Chemistry Letters 46 ( 4 ) 412 - 422 2017.4 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Publisher： The Chemical Society of Japan Single Work

Other Link： https://www.journal.csj.jp/doi/10.1246/cl.161044

Reversible Three-Electron Redox Reaction of Mo3+/Mo6+ for Rechargeable Lithium Batteries

Satoshi Hoshino, Alexey M. Glushenkov, Shinnosuke Ichikawa, Tetsuya Ozaki, Tokuo Inamasu, and Naoak … Show more authors

ACS Energy Letters 2 733 - 738 2017.4 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Origin of stabilization and destabilization in solid-state redox reaction of oxide ions for lithium-ion batteries

Naoaki Yabuuchi, Masanobu Nakayama, Mitsue Takeuchi, Shinichi Komaba, Yu Hashimoto, Takahiro Mukai, … Show more authors

Nature Communications 7 13814 2016.12 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Thermal Stability of NaxCrO2 for Rechargeable Sodium Batteries; Studies by High-Temperature Synchrotron X-ray Diffraction

Naoaki Yabuuchi, Issei Ikeuchi, Kei Kubota, and Shinichi Komaba

ACS Applied Materials & Interfaces 8 32292 - 32299 2016.11 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Layered NaxCrxTi1-xO2 as Bifunctional Electrode Materials for Rechargeable Sodium Batteries

Yuka Tsuchiya, Kazuki Takanashi, Takuya Nishinobo, Akiko Hokura, Masao Yonemura, Takeshi Matsukawa, … Show more authors

Chemistry of Materials 28 7006 - 7016 2016.10 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Synthesis and Electrode Performance of Li4MoO5-LiFeO2 Binary System as Positive Electrode Materials for Rechargeable Lithium Batteries

Takashi Matsuhara, Yuka Tsuchiya, Keisuke Yamanaka, Kei Mitsuhara, Toshiaki Ohta, and Naoaki Yabuuch

Electrochemistry 84 797 - 801 2016.10 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Understanding the Structural Evolution and Redox Mechanism of a NaFeO2 -NaCoO2 Solid Solution for Sodium-Ion Batteries

Kei Kubota, Takuya Asari, Hiroaki Yoshida, Naoaki Yabuuchi, Hiromasa Shiiba, Masanobu Nakayama, an … Show more authors

Advanced Functional Materials 26 6047 - 6059 2016.9 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Impact of the Cut-Off Voltage on Cyclability and Passive Interphase of Sn-Polyacrylate Composite Electrodes for Sodium-Ion Batteries

Mika Fukunishi, Naoaki Yabuuchi, Mouad Dahbi, Jin-Young Son, Yitao Cui, Hiroshi Oji, and Shinichi K … Show more authors

Journal of Physical Chemistry C 120 15017 - 15026 2016.7 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Black Phosphorus as a High-Capacity, High-Capability Negative Electrode for Sodium-Ion Batteries: Investigation of the Electrode/Electrolyte Interface

Mouad Dahbi, Naoaki Yabuuchi, Mika Fukunishi, Kei Kubota, Kuniko Chihara, Kazuyasu Tokiwa, Xue-fang … Show more authors

Chemistry of Materials 28 1625 - 1635 2016.3 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Synthesis and electrochemical properties of Li1.3Nb0.3V0.4O2 as a positive electrode material for rechargeable lithium batteries

Naoaki Yabuuchi, Mitsue Takeuchi, Shinichi Komaba, Shinnosuke Ichikawa, Tetsuya Ozaki and Tokuo Ina … Show more authors

Chemical Communications 52 2051 - 2054 2016.2 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Understanding Particle-Size-Dependent Electrochemical Properties of Li2MnO3-Based Positive Electrode Materials for Rechargeable Lithium Batteries

Naoaki Yabuuchi, Kei Kubota, Yoshinori Aoki, and Shinichi Komaba

Journal of Physical Chemistry C 120 875 - 885 2016.1 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Synthesis and Electrochemical Properties of Li4MoO5-NiO Binary System as Positive Electrode Materials for Rechargeable Lithium Batteries

Naoaki Yabuuchi, Yoshiyuki Tahara, Shinichi Komaba, Satsuki Kitada, and Yoshio Kajiya

Chemistry of Materials 28 416 - 419 2016.1 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Acrylic Acid-Based Copolymers as Functional Binder for Silicon/Graphite Composite Electrode in Lithium-Ion Batteries

Shoko Aoki, Zhen-Ji Han, Kiyofumi Yamagiwa, Naoaki Yabuuchi, Masahiro Murase, Kuniaki Okamoto, Taka … Show more authors

Journal of The Electrochemical Society 162 A2245 - A2249 2015.8 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

High-Capacity Electrode Materials for Rechargeable Lithium Batteries: Li3NbO4-based System with Cation Disordered Rocksalt Structure

Naoaki Yabuuchi, Mitsue Takeuchi, Masanobu Nakayama, Hiromasa Shiiba, Masahiro Ogawa, Keisuke Nakay … Show more authors

Proceedings of the National Academy of Sciences of the United States of America 112 7650 - 7655 2015.6 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Improved High-Temperature Performance and Surface Chemistry of Graphite/LiMn2O4 Li-Ion Cells by Fluorosilane-Based Electrolyte Additive

Kiyofumi Yamagiwa, Daichi Morita, Naoaki Yabuuchi, Tatsuya Tanaka, Mika Fukunishi, Takayuki Taki, H … Show more authors

Electrochimica Acta 160 347 - 356 2015.4 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Electrochemical lithiation performance and characterization of silicon-graphite composites with lithium, sodium, potassium, and ammonium polyacrylate binders

Zhen-Ji Han, Kiyofumi Yamagiwa, Naoaki Yabuuchi, Jin-Young Son, Yi-Tao Cui, Hiroshi Oji, Akinori K … Show more authors

Physical Chemistry Chemical Physics 17 3783 - 3795 2015.2 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

New Insight into Structural Evolution in Layered NaCrO2 during Electrochemical Sodium Extraction

Kei Kubota, Issei Ikeuchi, Tetsuri Nakayama, Chikara Takei, Naoaki Yabuuchi, Hiromasa Shiiba, Masan … Show more authors

Journal of Physical Chemistry C 119 166 - 175 2015.1 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Electrochemical Properties of LiCoO2 Electrodes with Latex Binders on High-Voltage Exposure

Naoaki Yabuuchi, Yuta Kinoshita, Kimio Misaki, Takashi Matsuyama, and Shinichi Komaba

Journal of The Electrochemical Society 162 A538 - A544 2015.1 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Research Development on Sodium-ion Batteries

Naoaki Yabuuchi, Kei Kubota, Mouad Dahbi, and Shinichi Komaba

Chemical Reviews 114 11636 - 11682 2014.12 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

A new electrode material for rechargeable sodium batteries: P2-type Na2/3[Mg0.28Mn0.72]O2 with anomalously high reversible capacity

Naoaki Yabuuchi, Ryo Hara, Kei Kubota, Jens Paulsen, Shinichi Kumakura, and Shinichi Komaba

Journal of Materials Chemistry A 2 16854 - 16855 2014.10 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Na2CoPO4F as a High-voltage Electrode Material for Na-ion Batteries

Kei Kubota, Kazuki Yokoh, Naoaki Yabuuchi, Shinichi Komaba

Electrochemistry 82 909 - 911 2014.10 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

New O2/P2-type Li-Excess Layered Manganese Oxides as Promising Multi-Functional Electrode Materials for Rechargeable Li/Na Batteries

Naoaki Yabuuchi, Ryo Hara, Masataka Kajiyama, Kei Kubota, Toru Ishigaki, Akinori Hoshikawa, and Sh … Show more authors

Advanced Energy Materials 4 1301453 2014.9 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

Negative Electrodes for Na-Ion Batteries

Mouad Dahbi, Naoaki Yabuuchi, Kei Kubota, Kazuyasu Tokiwa, and Shinichi Komaba

Physical Chemistry Chemical Physics 16 15007 - 15028 2014.8 [Reviewed]

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Language：English Publishing type：Research paper (scientific journal) Joint Work

Fabrication of Carbon Felt-Based Multi-Enzyme Immobilized Anodes to Oxidize Sucrose for Biofuel Cells

Yutaka Handa, Kiyofumi Yamagiwa, Yutaro Ikeda, Yuichi Yanagisawa, Shinya Watanabe, Naoaki Yabuuchi, … Show more authors

ChemPhysChem 15 2145 - 51 2014.7 [Reviewed]

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Recent research progress on iron- and manganese-based positive electrode materials for rechargeable sodium batteries

Naoaki Yabuuchi and Shinichi Komaba

Science and Technology of Advanced Materials 15 043501 2014.7 [Reviewed]

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Sodium carboxymethyl cellulose as a potential binder for hard carbon negative electrodes in sodium-ion batteries

Mouad Dahbi, Takeshi Nakano, Naoaki Yabuuchi, Toru Ishikawa, Kei Kubota, Mika Fukunishi, Sota Shiba … Show more authors

Electrochemistry Communications 44 66 - 69 2014.7 [Reviewed]

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Layered Oxides as Positive Electrode Materials for Na-Ion Batteries

Kei Kubota, Naoaki Yabuuchi, Hiroaki Yoshida, Mouad Dahbi, and Shinichi Komaba

MRS Bulletin 39 412 - 422 2014.5 [Reviewed]

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P2-type Na2/3Ni1/3Mn2/3-xTixO2 as a new positive electrode for higher energy Na-ion batteries

Hiroaki Yoshida, Naoaki Yabuuchi, Kei Kubota, Issei Ikeuchi, Arnd Garsuch, Martin Schulz-Dobrick, a … Show more authors

Chemical Communications 50 3677 - 3680 2014.4 [Reviewed]

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Phosphorus Electrodes in Sodium Cells: Small Volume Expansion by Sodiation and the Surface-Stabilization Mechanism in Aprotic Solvent

Naoaki Yabuuchi, Yuta Matsuura, Toru Ishikawa, Satoru Kuze, Jin-Young Son, Yi-Tao Cui, Hiroshi Oji, … Show more authors

ChemElectroChem 1 580 - 589 2014.3 [Reviewed]

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Efficient Electrolyte Additives of Phosphate, Carbonate, and Borate to Improve Redox Capacitor Performance of Manganese Oxide Electrodes

Shinichi Komaba, Tomoya Tsuchikawa, Masataka Tomita, Naoaki Yabuuchi, and Atsushi Ogata

Journal of The Electrochemical Society 160 A1952 - A1961 2013.9 [Reviewed]

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Efficient Electrolyte Additives of Phosphate, Carbonate, and Borate to Improve Redox Capacitor Performance of Manganese Oxide Electrodes

Hiroaki Yoshida, Naoaki Yabuuchi, Shinichi Komaba

Electrochemistry Communications 34 60 - 63 2013.9 [Reviewed]

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A Comparative Study on LiCoO2 Polymorphs: Structural and Electrochemical Characterization of O2, O3, and O4-type Phases

Naoaki Yabuuchi, Yuta Kawamoto, Ryo Hara, Toru Ishigaki, Akinori Hoshikawa, Masao Yonemura, Takashi … Show more authors

Inorganic Chemistry 52 9131 - 9142 2013.8 [Reviewed]

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A layer-structured Na2CoP2O7 pyrophosphate cathode for sodium-ion batteries

Prabeer Barpanda, Jiechen Lu, Tian Ye, Masataka Kajiyama, Sai-Cheong Chung, Naoaki Yabuuchi, Shini … Show more authors

RSC Advances 3 3957 - 3860 2013.3 [Reviewed]

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Synthesis and Electrode Performance of O3-Type NaFeO2-NaNi1/2Mn1/2O2 Solid Solution for Rechargeable Sodium Batteries

Naoaki Yabuuchi, Masaya Yano, Hiroaki Yoshida, Satoru Kuze, and Shinichi Komaba

Journal of The Electrochemical Society 2013.3 [Reviewed]

DOI

Language：English Publishing type：Research paper (scientific journal) Joint Work

NMR study for electrochemically inserted Na in hard carbon electrode of sodium ion battery

Kazuma Gotoh, Toru Ishikawa, Saori Shimadzu, Naoaki Yabuuchi, Shinichi Komaba, Kazuyuki Takeda, Ats … Show more authors

Journal of Power Sources 225 137 - 140 2013.3 [Reviewed]

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Cross-Linked Poly(acrylic acid) with Polycarbodiimide as Advanced Binder for Si/Graphite Composite Negative Electrodes in Li-Ion Batteries

Zhen-Ji Han, Naoaki Yabuuchi, Shota Hashimoto, Takeo Sasaki, and Shinichi Komaba

ECS Electrochemistry Letters 2 A17 - A20 2013.1 [Reviewed]

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Structural and Electrochemical Characterizations on Li2MnO3-LiCoO2-LiCrO2 System as Positive Electrode Materials for Rechargeable Lithium Batteries

Naoaki Yabuuchi, Kazuyo Yamamoto, Kazuhiro Yoshii, Izumi Nakai, Takeshi Nishizawa, Atsuo Omaru, Tak … Show more authors

Journal of The Electrochemical Society 160 A39 - A45 2013.1 [Reviewed]

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Crop-Derived Polysaccharides as Binders for High-Capacity Silicon/Graphite-Based Electrodes in Lithium-Ion Batteries

Masahiro Murase, Naoaki Yabuuchi, Zhen-Ji Han, Jin-Young Son, Yi-Tao Cui, Hiroshi Oji and Shinichi … Show more authors

ChemSusChem 5 2307 - 2311 2012.12 [Reviewed]

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Electrochemical behavior and structural change of spinel-type Li[LixMn2-x]O4 (x = 0 and 0.2) in sodium ells

Naoaki Yabuuchi, Masaya Yano, Satoru Kuze, and Shinichi Komaba

Electrochimica Acta 82 296 - 301 2012.11 [Reviewed]

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Crystal Structures and Electrode Performance of Alpha-NaFeO2 for Rechargeable Sodium Batteries

Naoaki Yabuuchi, Hiroaki Yoshida, and Shinichi Komaba

Electrochemistry 80 716 - 719 2012.10 [Reviewed]

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High-capacity Si-graphite composite electrodes with a self-formed porous structure by a partially neutralized polyacrylate for Li-ion batteries

Zhen-Ji Han, Naoaki Yabuuchi, Keiji Shimomura, Masahiro Murase, Hiroharu Yui, Shinichi Komaba

Energy & Environmental Science 5 9014 - 9020 2012.9 [Reviewed]

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Redox reaction of Sn-polyacrylate electrodes in aprotic Na cell

Shinichi Komaba, Yuta Matsuura, Toru Ishikawa, Naoaki Yabuuchi, Wataru Murata, and Satoru Kuze

Electrochemistry Communications 21 65 - 68 2012.7 [Reviewed]

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P2-Nax[Fe1/2Mn1/2]O2 made from earth-abundant elements for rechargeable Na batteries

Naoaki Yabuuchi, Masataka Kajiyama, Junichi Iwatate, Heisuke Nishikawa, Shuji Hitomi, Ryoichi Okuya … Show more authors

Nature Materials 11 512 - 517 2012.6 [Reviewed]

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Study on the Reversible Electrode Reaction of Na1-xNi0.5Mn0.5O2 for a Rechargeable Sodium-Ion Battery

Shinichi Komaba, Naoaki Yabuuchi, Tetsuri Nakayama, Atsushi Ogata, Toru Ishikawa, and Izumi Nakai

Inorganic Chemistry 51 6211 - 6220 2012.6 [Reviewed]

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