Elucidation of the Mechanism of High Battery Performance of Iron Oxide Cathode with Low Crystallinity by PDF Analysis

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14766
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Okayama University
• Principal Investigator: Takahashi Masakuni 岡山大学, 環境生命自然科学学域, 助教 (90908196)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: リチウムイオン二次電池 / 正極材料 / 酸化鉄

Outline of Final Research Achievements

In this study, we controlled the defect structure of the material by material compositing of iron oxide and clarified the effect of the defect structure on battery performance. As a result, it was found that the amorphous iron oxide composited with other material not only exhibited higher rate and cycle properties compared to normal amorphous iron oxide, but also compared to the existing material, lithium cobalt oxide. The structure of the amorphous composite material was also evaluated by pair distribution function analysis. Although the structural changes associated with the material composites of iron oxide were confirmed, it became clear that more detailed structural analysis is needed to clarify the correlation between the defect structure and battery performance.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

本研究ではリチウムイオン二次電池の高性能化のために、アモルファス正極材料の材料複合化による欠陥構造の制御と電池性能との相関性の解明を行った。その結果、材料複合化によって従来の正極材料と比較して高速充放電可能なアモルファス酸化鉄複合材料の開発に成功した。得られた知見は、電気化学分野の発展に繋がるだけはなく、今後のアモルファス正極材料の開発にとっても重要なものである。