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Optimizing LiMn$$_{1.5}$$M$$_{0.5}$$O$$_{4}$$ 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

Shimokawa, Kohei*; Matsubara, Shogo*; Kawaguchi, Tomoya*; Okamoto, Akihiro*; Ichitsubo, Tetsu

Spinel oxides can be a promising high-potential cathode material of photo-rechargeable batteries. However, LiMn$$_{1.5}$$M$$_{0.5}$$O$$_{4}$$ (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. LiMn$$_{1.5}$$Fe$$_{0.5}$$O$$_{4}$$ showed a substantially higher discharge capacity compared to that of LiMn$$_{2}$$O$$_{4}$$ 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.

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パーセンタイル:20.85

分野:Chemistry, Multidisciplinary

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