Copper sulfide nanoparticles as high-performance cathode materials for magnesium secondary batteries.
Copper sulfide nanoparticles as high-performance cathode materials for magnesium secondary batteries.
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DOI：
10.1039/c8nr03375g
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发表时间：
2018-07
期刊：
影响因子：
6.7
通讯作者：
Mengyi Wu;Yujie Zhang;Ting Li;Zhongxue Chen;Shunan Cao;Fei Xu
中科院分区：
文献类型：
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作者：
Mengyi Wu;Yujie Zhang;Ting Li;Zhongxue Chen;Shunan Cao;Fei Xu
镁二次电池具有无枝晶电沉积的特点，是高安全性的大型储能系统的理想选择。然而，寻找可用的正极材料仍然是一个重大挑战，阻碍了它们的发展。在这项工作中，我们报道了硫化铜纳米颗粒作为镁二次电池的高性能正极材料，它在50 mA g-1下提供175 mA h g-1的高可逆容量。阴极还显示出出色的速率能力，在1000 mA g-1时提供90 mA h g-1，并且在350次循环中具有出色的长期可循环性。这些有利的性能归因于小尺寸的硫化铜颗粒有利于固态扩散动力学。进一步的机理研究表明，该反应是典型的转化反应，优异的循环稳定性是由于cu纳米粒子在循环过程中不易聚集。本工作为镁二次电池提供了一种丰富、低成本、高性能的正极材料，为镁二次电池系统在大规模储能装置中的实际应用提供了可行性。
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.