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Affiliation |
Faculty of Engineering, Division of Materials Science and Chemical Engineering |
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Job Title |
Professor |
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Research Fields, Keywords |
エネルギー, 固体化学, 電池 |
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Mail Address |
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Related SDGs |
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YABUUCHI Naoaki
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Degree 【 display / non-display 】
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Doctor of Engineering - Osaka City University
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Master of Engineering - Osaka City University
Campus Career 【 display / non-display 】
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2018.4
Duty Yokohama National UniversityFaculty of Engineering Division of Materials Science and Chemical Engineering Professor
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2023.4
Concurrently Yokohama National UniversityInstitute for Multidisciplinary Sciences Professor
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2020.10
Concurrently Yokohama National UniversityInstitute of Advanced Sciences Professor
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2018.4
Concurrently Yokohama National UniversityGraduate School of Engineering Department of Materials Science and Engineering Professor
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2018.4
Concurrently Yokohama National UniversityCollege of Engineering Science Department of Chemistry, Chemical Engineering and Life Science Professor
External Career 【 display / non-display 】
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2014.4-2018.3
Tokyo Denki University Associate Professor
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2011.4-2013.3
Tokyo University of Science Lecturer
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2010.4-2011.3
Tokyo University of Science Assistant Professor
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2006.10-2008.9
Massachusetts Institute of Technology Postdoctoral Associate
Books 【 display / non-display 】
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車載用リチウムイオン電池の開発と市場 2024
藪内直明（ Role： Joint author , 次世代リチウムイオン電池用正極材料開発）
シーエムシー出版 （ ISBN:978-4-7813-1755-7 ） [Reviewed]
Responsible for pages：10 Language：Japanese Book type：Scholarly book
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ポストリチウムイオン二次電池開発 部材開発から解析・性能診断技術まで
藪内 直明（ Role： Contributor , 「多電子反応を利用する高容量Li過剰型カチオン不規則配列岩塩型正極材料」）
エヌ・ティー・エス （ ISBN:978-4-86043-836-4 ）
Total pages：492 Responsible for pages：75-82 Language：Japanese Book type：Scholarly book
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次世代二次電池の開発動向
藪内 直明（ Role： Contributor , 第II編第1章「リチウム過剰型正極材料の研究開発」）
シーエムシー出版 （ ISBN:978-4-7813-1730-4 ）
Total pages：247 Responsible for pages：47-55 Language：Japanese Book type：Scholarly book
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科学
藪内直明（ Role： Joint author , 結晶構造とイオン拡散－電極材料および固体電解質材料）
岩波書店
Responsible for pages：6 Language：Japanese Book type：Scholarly book
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現代化学
藪内直明（ Role： Joint author , 蓄電池研究が拓く脱化石燃料に向けた未来像）
東京化学同人
Responsible for pages：2 Language：Japanese Book type：General book, introductory book for general audience
Thesis for a degree 【 display / non-display 】
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Solid State Chemistry and Electrochemistry of LiCo1/3Ni1/3Mn1/3O2 for Advanced Lithium-Ion Batteries
2006.3
Doctoral Thesis Single Work
Papers 【 display / non-display 】
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Yin Jiaxuan, Zhang Yanjia, Kuriyama Tomohiro, Jin Yongcheng, Yabuuchi Naoaki
Chemistry of Materials 36 ( 18 ) 8682 - 8691 2024.9
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.
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A Practical and Sustainable Ni/Co-free High-Energy Electrode Material: Nanostructured LiMnO2
Yuka Miyaoka, Takahito Sato, Yuna Oguro, Sayaka Kondo, Koki Nakano, Masanobu Nakayama, Yosuke Ugata … Show more authors
Yuka Miyaoka, Takahito Sato, Yuna Oguro, Sayaka Kondo, Koki Nakano, Masanobu Nakayama, Yosuke Ugata, Damian Goonetilleke, Neeraj Sharma, Alexey M. Glushenkov, Satoshi Hiroi, Koji Ohara, Koji Takada, Yasuhiro Fujii, and Naoaki Yabuuchi Hide authors
ACS Central Science 10 ( 9 ) in press - 1732 2024.8 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Single Work
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Zhang Yanjia, Ugata Yosuke, Campeon BenoitDenis Louis, Yabuuchi Naoaki
Advanced Energy Materials 14 ( 23 ) 2024.6
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.
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State-of-the-art solid-state electrochemistry in Japan
Yabuuchi, N
JOURNAL OF SOLID STATE ELECTROCHEMISTRY 2024.6
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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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
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.
Review Papers 【 display / non-display 】
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リチウムイオン電池の基本原理と火災リスク要因
藪内直明
火災 2023.10 [Reviewed] [Invited]
Language：English Publishing type：Rapid communication, short report, research note, etc. (scientific journal) Single Work
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次世代リチウムイオン電池の安全性とエネルギー密度向上
宇賀田洋介、藪内直明
火災 2023.10 [Reviewed] [Invited]
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Single Work
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結晶構造とイオン拡散－電極材料および固体電解質材料
藪内直明
科学 2023.2 [Reviewed] [Invited]
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution) Single Work
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蓄電池研究が拓く脱化石燃料に向けた未来像
藪内直明
現代化学 2023.1 [Reviewed] [Invited]
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Single Work
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軟X線・硬X線吸収分光法を用いた正極材の電化補償機構の解明
藪内直明
セラミックス 2023.1 [Reviewed] [Invited]
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Single Work
Awards 【 display / non-display 】
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Selected as a fellow of the Royal Society of Chemistry (from the Royal Society of Chemistry)
2023.6 the Royal Society of Chemistry
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令和5年度 科学技術分野の文部科学大臣表彰 科学技術賞 (研究部門)
2023.4 文部科学省 先駆的インサーション材料開発と蓄電池への応用に関する研究
Individual or group name of awards：藪内直明
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Featured in the List of 2020 ANNUAL MOST CITED PAPERS, Ranked 1st, Electrochemistry
2021.2 THE ELECTROCHEMICAL SOCIETY OF JAPAN Crystal Structures and Electrode Performance of Alpha-NaFeO2 for Rechargeable Sodium Batteries
Individual or group name of awards：Naoaki YABUUCHI, Hiroaki YOSHIDA, Shinichi KOMABA
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Featured in the List of CONTINUOUSLY HIGHLY CITED PAPERS, Ranked 5th, Electrochemistry
2021.2 THE ELECTROCHEMICAL SOCIETY OF JAPAN Crystal Structures and Electrode Performance of Alpha-NaFeO2 for Rechargeable Sodium Batteries
Individual or group name of awards：Naoaki YABUUCHI, Hiroaki YOSHIDA, Shinichi KOMABA
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Global Star Award
2019.1 The American Ceramics Society, Engineering Ceramic Division
Individual or group name of awards：Naoaki YABUUCHI
Grant-in-Aid for Scientific Research 【 display / non-display 】
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チオン・アニオン配列低秩序化の特異性を利用した蓄電池材料の革新
Grant number：23K17954 2023.6 - 2025.3
Grant-in-Aid for Challenging Research (Exploratory)
Authorship：Principal investigator Grant type：Competitive
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格子の膨張収縮を生じない高濃度電荷蓄積を実現する高耐久性電極材料の創製
Grant number：21K18815 2021.7 - 2023.3
Grant-in-Aid for Challenging Research (Exploratory)
Authorship：Principal investigator Grant type：Competitive
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アニオンレドックスの可逆性を支配する原理解明と革新的蓄電池材料設計への応用
Grant number：21H04698 2021.4 - 2027.3
科学研究費補助金 Grant-in-Aid for Scientific Research(A)
Investigator(s)：藪内直明
Grant type：Competitive
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蓄電固体界面の機能開拓と界面新材料開発
Grant number：19H05816 2019.6 - 2024.3
科学研究費補助金 Grant-in-Aid for Scientific Research on Innovative Areas
Investigator(s)：藪内直明
Grant type：Competitive
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蓄電固体デバイスの創成に向けた界面イオンダイナミクスの科学
Grant number：19H05812 2019.6 - 2024.3
科学研究費補助金 Grant-in-Aid for Scientific Research on Innovative Areas
Investigator(s)：入山恭寿
Grant type：Competitive
Other external funds procured 【 display / non-display 】
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ASPIRE 先端国際共同研究推進事業
2024.2 - 2029.3
Japan Science and Technology Agency
Authorship：Coinvestigator(s)
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GteX（革新的GX技術創出事業）
2023.10 - 2028.3
Japan Science and Technology Agency
Authorship：Coinvestigator(s)
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次世代全固体蓄電池材料の評価・基盤技術開発／次世代全固体ＬＩＢ基盤技術開発
2023.4 - 2028.3
Ministry of Economy, Trade and Industry
Authorship：Coinvestigator(s)
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水を基軸とする未踏蓄電機能材料の開拓
Grant number：JPMJCR21O6 2021.10 - 2026.3
Japan Science and Technology Agency CREST
Authorship：Coinvestigator(s)
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再生可能エネルギー最大導入に向けた電気化学材料研究拠点
2021.4 - 2026.3
Ministry of Education, Culture, Sports, Science and Technology
Authorship：Coinvestigator(s)
Presentations 【 display / non-display 】
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Development of Nanostructured Li1.15Nb0.15Mn0.7O2 Integrated with Li3PO4
Naoaki Yabuuchi [Invited]
2023 International Conference on Niobium Based Batteries: Improving Cathode Performance with Niobium Technology,
Event date： 2023.12
Language：English Presentation type：Oral presentation (invited, special)
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High-capacity Positive Electrode Materials with Ordered/Disordered Structures for Advanced Lithium Batteries
Naoaki Yabuuchi [Invited]
4th Work Shop on Lithium Ion Batteries and Next Generation Batteries
Event date： 2023.11
Language：English Presentation type：Oral presentation (invited, special)
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High-capacity oxide-based electrode materials for advanced lithium batteries
Naoaki Yabuuchi [Invited]
Seoul Battery Forum 2023
Event date： 2023.11
Language：English Presentation type：Oral presentation (invited, special)
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Advanced Positive Electrode Materials for Li-ion Batteries
Naoaki Yabuuchi [Invited]
The 15th Pacific Rim Conference of Ceramic Societies (PACRIM15)
Event date： 2023.11
Language：English Presentation type：Oral presentation (keynote)
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Advanced Positive Electrode Materials with Niobium Ions for Lithium Battery Applications
Naoaki Yabuuchi [Invited]
2023 Internationa Conference on Niobium Based Batteries
Event date： 2023.10
Language：English Presentation type：Oral presentation (invited, special)
Past of Collaboration and Commissioned Research 【 display / non-display 】
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Panasonic
Funded Research offered by Enterprises
Project Year： 2021.9 - 2022.3
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LG Japan
Funded Research offered by Enterprises
Project Year： 2021.8 - 2022.7
Charge of on-campus class subject 【 display / non-display 】
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2024 Exercise in Energy and Sustainable Chemistry BF
Graduate school of Engineering Science
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2024 Exercise in Energy and Sustainable Chemistry BS
Graduate school of Engineering Science
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2024 Solid State Chemistry
Graduate school of Engineering Science
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2024 Introduction to Solid State Physics
College of Engineering Science
Committee Memberships 【 display / non-display 】
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総務省消防庁 「リチウムイオン蓄電池に係る危険物規制に関する検討会」
2023.4 - 2024.3 委員
Committee type：Other
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ICACC 2024
2023.1 - 2024.2 Symposium Organizer of ICACC 2024 S6: Advanced Materials and Technologies for Rechargeable Energy Storage, Daytona Beach
Committee type：Academic society
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ISE 74th Annual Meeting
2022.9 - 2023.9 Symposium Organizer of ISE 74th Annual Meeting, S4: From Lithium ion to post-Li ion batteries: Fundamental understanding and application aspects
Committee type：Academic society
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総務省消防庁 「蓄電池設備のリスクに応じた防火安全対策検討部会」
2022.5 - 2023.3 委員
Committee type：Other
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株式会社パソナ「中小企業等事業再構築促進事業」
2022.4 - 2024.3 書面審査委員
Committee type：Other
Social Contribution(Extension lecture) 【 display / non-display 】
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電気化学会 セミナーD “最先端電池技術 2024
Role(s)： Lecturer, Logistic support
2024.2
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第63回 電気化学セミナー “蓄電池の未来 ー学術・技術・人材育成の展望ー
Role(s)： Lecturer
2023.10
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構造物性研究会・コヒーレント構造科学研究会 合同研究会
Role(s)： Lecturer
2023.9
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Interface Ionics for All-Solid-State Batteries
Role(s)： Lecturer
Interface Ionics for All-Solid-State Batteries 2023.6
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2022年度立命館大学SRセンター –研究成果報告会–
Role(s)： Lecturer
2023.6
Media Coverage 【 display / non-display 】
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Cobalt-free electrodes achieved with nickel ions
2024.3
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高エネ密度でコバルトフリーのニッケル系電池材料＝横浜国大など
MIT Technology Review Japan 2024.2
Author：Other
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高エネ密度・長寿命のコバルトニッケルフリー電池材料
MIT Technology Review Japan 2023.7
Author：Other
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全固体電池、トヨタと共同研究の横浜国立大学教授に聞く
日経新聞社 2023.7
Author：Other