A research field of all-solid-state Li batteries with complex hydride electrolytes opened by epitaxial film approach

• Project/Area Number: 18H01727
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Shibaura Institute of Technology (2020); Tohoku University (2018-2019)
• Principal Investigator: Oguchi Hiroyuki 芝浦工業大学, 工学部, 教授 (40570908)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000); Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2019: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000); Fiscal Year 2018: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
• Keywords: 薄膜 / 全固体電池 / 固体電解質 / 界面 / 錯体水素化物 / 水素化物 / 高真空 / エピタキシャル薄膜 / Liイオン伝導 / 電極－電解質界面

Outline of Final Research Achievements

This research tried to improve film quality of LiBH4, which is a solid electrolyte having a good affinity with a Li metal anode. Since the Li metal anode has high Li capacity, LiBH4 may play a key role for future development of the all-solid-state batteries. The primary achievement of this research was successful establishment of growth method of high quality LiBH4 films with high purity and excellent flatness. In addition, this research could grow LiCoO2 and LiI films in preparation to fabrication of the all-solid-state batteries with a LiBH4 film as an electrolyte.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により、電解質と電極の接合部で起こる化学現象を、薄膜技術を使用することでこれまでより深く理解することが可能になった。また、IoT情報ネットワークの普及に必須の自立型センサの電源と期待される薄膜型全固体電池の開発へ向けて前進した。

Research Products

• [Journal Article] Microstructural analyses of all-solid-state Li-S batteries using LiBH4-based solid electrolyte for prolonged cycle performance (2020)
  • Author(s): Kazuaki Kisu、Sangryun Kim、Ryuga Yoshida、Hiroyuki Oguchi、Naoki Toyama、Shin-ichi Orimo
  • Journal Title: Journal of Energy Chemistry Volume: - Pages: 424-429
  • DOI: 10.1016/j.jechem.2020.03.069
  • Peer Reviewed
• [Journal Article] Complex Hydride Solid Electrolytes of the Li(CB9H10)?Li(CB11H12) Quasi-Binary System: Relationship between the Solid Solution and Phase Transition, and the Electrochemical Properties (2020)
  • Author(s): Kim Sangryun、Kisu Kazuaki、Takagi Shigeyuki、Oguchi Hiroyuki、Orimo Shin-ichi
  • Journal Title: ACS Applied Energy Materials Volume: 3 Issue: 5 Pages: 4831-4839
  • DOI: 10.1021/acsaem.0c00433
  • Peer Reviewed
• [Journal Article] Metal Hydrides: Epitaxial Growth and Electronic Properties (2020)
  • Author(s): Shimizu Ryota、Oguchi Hiroyuki、Hitosugi Taro
  • Journal Title: Journal of the Physical Society of Japan Volume: 89 Issue: 5 Pages: 051012-051012
  • DOI: 10.7566/jpsj.89.051012
  • NAID: 210000158109
  • Peer Reviewed / Open Access
• [Journal Article] Magnesium Borohydride Ammonia Borane as a Magnesium Ionic Conductor (2020)
  • Author(s): Kisu Kazuaki、Kim Sangryun、Inukai Munehiro、Oguchi Hiroyuki、Takagi Shigeyuki、Orimo Shin-ichi
  • Journal Title: ACS Applied Energy Materials Volume: 3 Issue: 4 Pages: 3174-3179
  • DOI: 10.1021/acsaem.0c00113
  • Peer Reviewed
• [Journal Article] Room temperature operation of all-solid-state battery using a closo-type complex hydride solid electrolyte and a LiCoO2 cathode by interfacial modification (2020)
  • Author(s): Kim Sangryun、Harada Kentaro、Toyama Naoki、Oguchi Hiroyuki、Kisu Kazuaki、Orimo Shin-ichi
  • Journal Title: Journal of Energy Chemistry Volume: 43 Pages: 47-51
  • DOI: 10.1016/j.jechem.2019.08.007
  • Peer Reviewed / Open Access
• [Journal Article] Lithium ion conductivity of complex hydrides incorporating multiple closo-type complex anions (2019)
  • Author(s): N. Toyama, S. Kim, H. Oguchi, T. Sato, S. Takagi, M. Tazawa, G. Nogami, S. Orimo
  • Journal Title: Journal of Energy Chemistry Volume: 38 Pages: 84-87
  • DOI: 10.1016/j.jechem.2019.01.009
  • Peer Reviewed / Open Access
• [Journal Article] Interfacial stability between LiBH4-based complex hydride solid electrolytes and Li metal anode for all-solid-state Li batteries (2019)
  • Author(s): Kisu Kazuaki、Kim Sangryun、Oguchi Hiroyuki、Toyama Naoki、Orimo Shin-ichi
  • Journal Title: Journal of Power Sources Volume: 436 Pages: 226821-226821
  • DOI: 10.1016/j.jpowsour.2019.226821
  • Peer Reviewed
• [Journal Article] Ionic conduction in Li3Na(NH2)4: Study of the material design for the enhancement of ion conductivity in double-cation complex hydrides (2019)
  • Author(s): B. Paik, H. Oguchi, T. Sato, S. Takagi, A. Dorai, N. Kuwata, J. Kawamura, S. Orimo
  • Journal Title: AIP Advances Volume: 9 Issue: 5 Pages: 055109-055109
  • DOI: 10.1063/1.5093580
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A hysteresis loop in electrical resistance of NbHx observed above the β?λ transition temperature (2019)
  • Author(s): Sasahara Yuki、Shimizu Ryota、Oguchi Hiroyuki、Nishio Kazunori、Ogura Shohei、Morioka Hitoshi、Orimo Shin-ichi、Fukutani Katsuyuki、Hitosugi Taro
  • Journal Title: AIP Advances Volume: 9 Issue: 1 Pages: 015027-015027
  • DOI: 10.1063/1.5066367
  • Peer Reviewed / Open Access
• [Journal Article] A complex hydride lithium superionic conductor for high-energy-density all-solid-state lithium metal batteries (2019)
  • Author(s): Kim Sangryun、Oguchi Hiroyuki、Toyama Naoki、Sato Toyoto、Takagi Shigeyuki、Otomo Toshiya、Arunkumar Dorai、Kuwata Naoaki、Kawamura Junichi、Orimo Shin-ichi
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 1081-1081
  • DOI: 10.1038/s41467-019-09061-9
  • Peer Reviewed / Open Access
• [Journal Article] Fast Lithium-Ion Conduction in Atom-Deficient closo-Type Complex Hydride Solid Electrolytes (2018)
  • Author(s): Kim Sangryun、Toyama Naoki、Oguchi Hiroyuki、Sato Toyoto、Takagi Shigeyuki、Ikeshoji Tamio、Orimo Shin-ichi
  • Journal Title: Chemistry of Materials Volume: 30 Issue: 2 Pages: 386-391
  • DOI: 10.1021/acs.chemmater.7b03986
  • Peer Reviewed / Open Access
• [Presentation] Synthesis and Energy-Related Function of Advanced Complex Hydrides (2019)
  • Author(s): 大口 裕之
  • Organizer: The 20th KIM-JIM Symposium（日本金属学会2019年秋季講演大会合同シンポジウム）
  • Invited
• [Presentation] 錯体水素化物研究の新展開を目指した錯イオン転写法によるLiBH4エピタキシャル薄膜合成 (2018)
  • Author(s): 大口 裕之
  • Organizer: 第79回応用物理学会秋季大会
• [Presentation] 錯体水素化物初のエピタキシャル薄膜: LiBH4 (2018)
  • Author(s): 大口 裕之
  • Organizer: 日本金属学会2018年秋季講演大会
• [Presentation] Evolution of epitaxial film growth techniques for hydrides (2018)
  • Author(s): 大口 裕之
  • Organizer: The 4th Korea-Japan Joint Symposium on Hydrogen in Materials
  • Int'l Joint Research