Development of electrode materials which form in-situ formed electrolyte for solid-state batteries

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05243
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Kyushu University
• Principal Investigator: Inoishi Atsushi 九州大学, 先導物質化学研究所, 准教授 (10713448)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 固体電解質その場形成負極 / Ca(BH4)2 / TiH2 / MgH2 / MgCl2 / LiBH4 / LiH / コンバージョン反応

Outline of Final Research Achievements

At the beginning of the research, it was discovered that all-solid-state lithium-ion batteries using magnesium compounds such as MgH2, Mg(BH4)2 could be charged and discharged without containing a solid electrolyte in the electrode mixture. In this research,TiH2 with high electronic conductivity and Ca(BH4)2 with high ionic conductivity were newly developed as negative electrodes which form in-situ formed electrolyte.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

固体電解質その場形成は全固体電池の実質的な負極用量を大幅に向上する技術であり、蓄電池のエネルギー密度向上に寄与する。また、固体電解質その場形成の反応は電極反応を進行させる際のイオン導電パスを自身の放電生成物に依存するものであり、コンバージョン反応の進行しやすさを理解する上で好適な題材である。