Non-stoichiometric Cu2-xSe hollow nanocubes cathodes enabling high-rate capability and ultra-long cyclic stability rechargeable Mg batteries

阴极 化学计量学 电化学 材料科学 化学工程 储能 电极 电导率 扩散 纳米技术 化学 物理化学 工程类 功率(物理) 物理 量子力学 热力学
作者
Wenjie Zhao,Yujie Zhang,Haomiao Li,Yi Shen,Kangli Wang,Kai Jiang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:464: 142654-142654 被引量:10
标识
DOI:10.1016/j.cej.2023.142654
摘要

Rechargeable Mg batteries with the merits of low cost, high safety and environmental compatibility are deemed as promising energy storage techniques for large-scale applications. However, the actual development of rechargeable Mg batteries is constantly hindered by the difficulty of finding suitable electrode materials to accommodate Mg2+. Cu2-xSe has exceptionally high electrical conductivity and its unique crystal structure could be better compatible with Mg2+ cations. Herein, a novel Cu2-xSe hollow nanocube with extraordinarily high conductivity and unique structure was designed and synthesized by facile one-step template-directed selenation reaction methods. The excellent Mg electrochemical performance of Cu2-xSe hollow nanocube cathodes was demonstrated based on rechargeable Mg batteries. The Cu2-xSe NCs provide a high specific capacity of 232.5 mAh g-1 at 100 mA g-1, superior cycling stability over 3700 cycles, and an excellent rate capacity of 163.1 mAh g-1 at 3000 mA g-1. Furthermore, the two-step magnesiation/demagnesiation processes of the Cu2-xSe NC cathodes were revealed, and the accelerating effects of the fast Mg2+ diffusion in the unique hierarchical structure on magnesium storage performance were analyzed. The outcomes of this study not only provide simple methods for fabricating high-performance Cu2-xSe cathodes but also propose valuable insights for exploring conversion-type Mg-storage materials.
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