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論文

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

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

https://doi.org/10.1039/D3CC01902K
 被引用回数：1 パーセンタイル：0(Chemistry, Multidisciplinary)

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.

論文

Mg-ion storage materials based on MnO$$_{2}$$ frameworks

下川 航平*; 畠山 拓也*; Li, H.*; 市坪 哲

Current Opinion in Electrochemistry, 38, p.101209_1 - 101209_8, 2023/04

https://doi.org/10.1016/j.coelec.2023.101209
 被引用回数：1 パーセンタイル：27.85(Chemistry, Physical)

A wide variety of crystal structures for MnO$$_{2}$$ is promising for basic frameworks of cathode materials in next-generation batteries such as Mg rechargeable batteries. In this short review, recent progress on MnO$$_{2}$$-based cathode materials for Mg rechargeable batteries is summarized, especially focusing on the structures of the polymorphs, $$alpha$$-MnO$$_{2}$$ and $$lambda$$-MnO$$_{2}$$, to discuss the criteria for achieving topotactic reactions during magnesiation.

論文

Mg-Zn-Mn oxide systems for a rechargeable Mg-battery cathode

Ye, X.*; 下川 航平*; 毛塚 有飛*; 畠山 拓也*; Li, H.*; 市坪 哲

Journal of Physical Chemistry C, 127(11), p.5210 - 5218, 2023/03

https://doi.org/10.1021/acs.jpcc.2c09071
 被引用回数：1 パーセンタイル：45.8(Chemistry, Physical)

In this study, wide-range compositions in Mg-Zn-Mn oxide systems were investigated to understand its phase stability for the development of high-energy-density rechargeable Mg batteries. The obtained results showed that the stability of the spinel structure can be significantly improved by compositionally incorporating stable XO (X = Zn, Mg) with $$lambda$$-MnO$$_{2}$$. In particular, (i) the equimolar mixing of XO and MnO$$_{2}$$ is essential to obtain a single-phase cubic spinel structure and (ii) a higher Zn/Mg ratio is effective for preventing the formation of an irreversible rock salt phase to decrease the overpotential during discharge/charge cycling.

論文

Light-induced Li extraction from LiMn$$_{2}$$O$$_{4}$$/TiO$$_{2}$$ in a water-in-salt electrolyte for photo-rechargeable batteries

下川 航平*; 松原 翔吾*; 岡本 章玄*; 市坪 哲

Chemical Communications, 58(69), p.9634 - 9637, 2022/09

https://doi.org/10.1039/D2CC03362C
 被引用回数：8 パーセンタイル：74.08(Chemistry, Multidisciplinary)

Photocharging of high-potential spinel LiMn$$_{2}$$O$$_{4}$$ is demonstrated by using a water-in-salt electrolyte and TiO$$_{2}$$ nanoparticles. In a developed half-cell system with an electron acceptor, Li extraction from LiMn$$_{2}$$O$$_{4}$$ proceeds under the illumination of UV-visible light at an estimated rate of c.a. 23 mA g$$^{-1}$$. This work paves the way for highpotential cathode materials in photo-rechargeable batteries.

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