Optimizing LiMnMO cathode materials for aqueous photo-rechargeable batteries

下川 航平*; 松原 翔吾*; 河口 智也*; 岡本 章玄*; 市坪 哲

Chemical Communications, 59(51), p.7947 - 7950, 2023/06

https://doi.org/10.1039/D3CC01902K

Spinel oxides can be a promising high-potential cathode material of photo-rechargeable batteries. However, LiMnMO (M = Mn) has a difficulty in a rapid degradation during charge/discharge under the illumination of UV-visible light. In this study, various spinel-oxide materials by modifying the composition (M = Fe, Co, Ni, Zn) were investigated to demonstrate photocharging in a water-in-salt aqueous electrolyte. LiMnFeO showed a substantially higher discharge capacity compared to that of LiMnO after long-term photocharging owing to enhanced stability under illumination. The result of this work provides fundamental design guidelines of spinel-oxide cathode materials to develop photo-rechargeable batteries.