Study on photoelectrochemical behavior of spinel-oxide cathode materials for advanced photo-rechargeable batteries

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14499
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Tohoku University
• Principal Investigator: Shimokawa Kohei 東北大学, 学際科学フロンティア研究所, 助教 (30876719)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 光蓄電池 / 正極材料 / 光電気化学 / スピネル型酸化物 / 結晶構造

Outline of Final Research Achievements

In this study, we focused on the photo-electrochemical behavior of spinel-oxide cathode materials for developing advanced photo-rechargeable batteries. We achieved to demonstrate the photo-charging of a series of spinel-oxide materials under illumination. Furthermore, we found that the disproportionation of transition metals was one of the reasons for the degradation of the cathode materials under illumination and proposed a design guideline for improving the stability.

Free Research Field

材料工学

Academic Significance and Societal Importance of the Research Achievements

光照射下における蓄電池正極材料の電気化学挙動の詳細は未解明であり，種々のスピネル型酸化物を用いた系統的な研究からそのメカニズムおよび性能向上に向けた設計指針を示した点に学術的な意義がある．さらに，光蓄電池は太陽光エネルギーの有効利用や小型デバイス用の電源として有望な次世代蓄電池の候補であり，その正極材料開発を推し進める本研究成果は社会的にも意義深い．