期刊
NANO RESEARCH
卷 16, 期 2, 页码 2399-2408出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4932-z
关键词
rechargeable magnesium batteries,conversion reaction mechanism; CuS nanoflower cathode; non-nucleophilic electrolyte; cycling lifespan
This study reports the application of CuS nanoflower cathode material based on the conversion reaction mechanism for highly reversible magnesium batteries. By adjusting the compatibility between the cathode and electrolyte, the magnesium batteries with CuS nanoflower cathode exhibit high discharge capacity and long cycle life.
Rechargeable magnesium batteries are attractive candidates for energy storage due to their high theoretical specific capacities, free of dendrite formation and natural abundance of magnesium. However, the development of magnesium secondary batteries is severely limited by the lack of high-performance cathode materials and the incompatibility of electrode materials with electrolytes. Herein, we report the application of CuS nanoflower cathode material based on the conversion reaction mechanism for highly reversible magnesium batteries with boosted electrochemical performances by adjusting the compatibility between the cathode and electrolyte. By applying non-nucleophilic electrolytes based on magnesium bis(hexamethyldisilazide) and magnesium chloride dissolved in the mixed solvent of tetrahydrofuran and N-butyl-N-methyl-piperidinium bis((trifluoromethyl)sulfonyl)imide (Mg(HMDS)(2)-MgCl2/THF-PP14TFSI) or magnesium bis(trifluoromethanesulfonyl)imide, magnesium chloride and aluminium chloride dissolved in dimethoxyethane (Mg(TFSl)(2)-MgCl2-AICl(3)/DME), the magnesium batteries with CuS nanoflower cathode exhibit a high discharge capacity of similar to 207 mAh.g(-1) at 100 mA.g(-1) and a long life span of 1,000 cycles at 500 mA.g(-1). This work suggests that the rational regulation of compatibility between electrode and electrolyte plays a very important role in improving the performance of multi-valent ion secondary batteries.
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