期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 37, 页码 21410-21420出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta07470h
关键词
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资金
- National Natural Science Foundation of China [51402113, 21403305]
- Fundamental Research Funds for the Central Universities
- Open Fund of the Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission AMP
- Ministry of Education
Rechargeable Mg batteries are potential candidates for large-scale energy storage systems due to highly abundant and dendrite-free Mg anodes. However, their performance is hindered by the bivalent Mg2+ cation. A hollow structure is advantageous for Mg-storage cathodes because cavities could provide extra electrochemically active sites and a large electrolyte-electrode interface for fast Mg2+ ion diffusion. In this work, three hollow CuS nanocubes are prepared by a facile method and comparatively investigated as Mg battery cathodes to obtain a comprehensive structure-performance relationship. It is observed that a dilute solution would result in small hollow CuS nanocubes with a thin wall and large specific surface area, which are favorable for solid-state Mg2+ ion diffusion, and thus result in a high reversible Mg-storage capacity. The hollow structure is also favorable for a good cycling stability. The hollow CuS nanocube cathode could deliver a high reversible capacity of 200 mA h g(-1) at 100 mA g(-1), a remarkable rate capability of 50 mA h g(-1) at 1000 mA g(-1), and an excellent long-term cycling stability. Mechanism investigation demonstrates a conversion reaction during charge/discharge cycling. This work provides a promising cathode design strategy for rechargeable Mg batteries to overcome the sluggish solid-state Mg2+ diffusion.
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