Control of High-Capacity Cathode Reaction in All-Solid-State Li Secondary Batteries by Liquid Phase Method

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14716
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Hikima Kazuhiro 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (50845617)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 液相複合化 / 硫化物固体電解質 / 電気化学的解析 / 断面微構造観察 / 全固体電池

Outline of Final Research Achievements

All-solid-state lithium-ion batteries, which replace the organic electrolyte with the solid electrolyte, are expected to be realized to improve safety. In this study, we aimed to apply the Li-rich transition metal oxides with high capacity to achieve high energy density at all-solid-state batteries. We fabricated cathode composites using the nucleation growth (SEED) method, which enables the uniform coating of the solid electrolytes on the surface of cathode active material particles. This study confirmed the improved capacity of new high-capacity type cathode active materials in all-solid-state batteries. Therefore, the SEED method is expected to be applied to prepare the cathode composites at all-solid-state batteries.

Free Research Field

無機材料科学

Academic Significance and Societal Importance of the Research Achievements

安全性向上のため、有機電解液を固体電解質に置き換えた全固体LIBの実現が期待されている。本研究では、正極活物質粒子表面に均一に固体電解質コーティング可能な核成長法による正極複合体の作製をし、全固体電池における放電容量を改善し、安定性も向上させることに成功した。蓄電池分野は今後市場拡大が予想される研究分野であり、未開拓である新規高容量正極活物質の全固体電池への応用に向けた道筋を示した本研究成果は、学術的・社会的に大きな意義がある。