Development of fast ionic conductors for next generation batteries by using soft and giant closo-ions

2022 Fiscal Year Final Research Report

• Project/Area Number: 18H03832
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Tohoku University
• Principal Investigator: Takamura Hitoshi 東北大学, 工学研究科, 教授 (30250715)
• Co-Investigator(Kenkyū-buntansha): 及川 格 東北大学, 工学研究科, 助教 (40733134) ; 松尾 元彰 関西学院大学, 理工学部, 准教授 (20509038)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Keywords: リチウムイオン伝導体 / 全固体電池 / 高圧合成 / 固体NMR

Outline of Final Research Achievements

This project focuses on a lithium-ion conductor with a giant close-do elaborate anion [B12H12]2- to enhance its ionic conductivity and get deep insight into the conduction mechanism. Li2B12H12 was successfully prepared by a high-pressure synthesis technique using LiBH4 and B10H14 as raw materials. The samples showing nonstoichiometry and hydrogen deficiency were prepared by adjusting the ratio of raw materials and adding Ti metal as a hydrogen getter. In addition, Mg2+, Ca2+, and even a giant organic cation of methylammonium (CH3NH3+) can be substituted. New electrode materials, protective layers, and room-temperature formable composite-type electrolytes with an oxide phase were also explored.

Free Research Field

固体イオニクス

Academic Significance and Societal Importance of the Research Achievements

高圧合成により新たなリチウムイオン伝導体を合成した。特に、巨大なクロソイオンを含む材料系で、種々の置換が可能であり、それが不定比性、構造、伝導度に及ぼす影響を明らかにできたことに学術的意義がある。社会的意義としては、固体電解質として全固体電池への適用を目指し、周辺材料（化学的両立性をもつ電極や保護層）の検討を行い、酸化物系で焼結がいらない複合体型電解質を提案したことがあげられる。