Development of high capacity and durable electrode materials with less strain on electrochemical cycling

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18815
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Yokohama National University
• Principal Investigator: Yabuuchi Naoaki 横浜国立大学, 大学院工学研究院, 教授 (80529488)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: 蓄電池

Outline of Final Research Achievements

In this study, the factors affecting lattice volume changes on lithium extraction/insertion are systematically studied. This study possibly contributes the development of durable insertion materials without deterioration of electrode performance. Layered materials show non-isotropic volume change on delithiation, but isotropic volume change is expected for materials with a disordered rocksalt structure. To stabilize the disordered rocksalt structure, Nb5+ and Ti4+ ions are used host structure coupled with different transition metal ions, V and Co ions. By comparing the reaction mechanisms of these electrode materials, the migration of transition metal ions is found to be an important parameter, which influences the volume change on electrochemical cycles. This finding contributes the further development of lithium insertion materials with excellent durability in the future.

Free Research Field

エネルギー化学

Academic Significance and Societal Importance of the Research Achievements

本研究成果はインサーション材料の膨張・収縮を制御するための学術的方法論の確立を行った。これらの知見は次世代の長寿命蓄電池用材料開発の実現に繋がることが期待できる。これらの技術を活用することで、将来における脱炭素社会実現を目指す上で非常に重要な技術となる次世代高性能蓄電池の実現に繋がることが期待できる。