Copper sulfide nanoparticles as high-performance cathode materials for magnesium secondary batteries

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...

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Bibliographic Details
Published in:Nanoscale 2018-01, Vol.10 (26), p.12526-12534
Main Authors: Wu, Mengyi, Zhang, Yujie, Li, Ting, Chen, Zhongxue, Cao, Shun-An, Xu, Fei
Format: Article
Language:English
Subjects:
Cathodes
Copper
Copper sulfides
Cycles
Dendritic structure
Electrode materials
Energy storage
Lithium
Magnesium
Nanoparticles
Reaction kinetics
Storage batteries
Storage systems
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Summary: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.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr03375g