Journal
NANOSCALE
Volume 10, Issue 26, Pages 12526-12534Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr03375g
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Funding
- National Natural Science Foundation of China [51402113, 21403305]
- Fundamental Research Funds for the Central Universities
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education
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Magnesium secondary batteries are promising candidates for large-scale energy storage systems with high safety, because of the dendrite-free electrodeposition of the magnesium anode. However, the search for available cathode materials remains a significant challenge, hindering their development. In this work, we report copper sulfide nanoparticles as high-performance cathode materials for magnesium secondary batteries, which deliver a high reversible capacity of 175 mA h g(-1) at 50 mA g(-1). The cathode also shows an excellent rate capability providing 90 mA h g(-1) at 1000 mA g(-1) and an outstanding long-term cyclability over 350 cycles. The beneficial properties are ascribed to the small-sized copper sulfide particles which facilitate the solid-state diffusion kinetics. Further investigation on the mechanism demonstrates that the reaction is a typical conversion reaction, and the excellent cycling stability is due to the CuS nanoparticles which are not facile to aggregate during cycling. This work introduces an abundant, low-cost and high-performance cathode material for magnesium secondary batteries, and provides feasibility for the practical application of magnesium secondary battery systems in large-scale energy storage devices.
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