Porous Copper Sulfide Microflowers Grown In Situ on Commercial Copper Foils as Advanced Binder-Free Electrodes with High Rate and Long Cycle Life for Sodium-Ion Batteries
Porous Copper Sulfide Microflowers Grown In Situ on Commercial Copper Foils as Advanced Binder-Free Electrodes with High Rate and Long Cycle Life for Sodium-Ion Batteries
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在商业铜箔上原位生长的多孔硫化铜微花作为先进的无粘合剂电极，具有高倍率和长循环寿命的钠离子电池
DOI：
10.1002/celc.202001355
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发表时间：
2021
期刊：
影响因子：
4
通讯作者：
Jiang Kai
中科院分区：
文献类型：
--
作者：
Tao Hongwei;Tang Yun;Zhou Min;Wang Ruxing;Wang Kangli;Li Haomiao;Jiang Kai
硫化铜（CuS）以其高理论容量（558 mAh g−1）、低成本和环境友好性被认为是一种有前途的钠存储阳极。 然而，具有高倍率和长寿命的适用CuS阳极的发展仍然受到缓慢的电子/离子传输动力学和重复充电/放电过程中的巨大体积变化的极大阻碍。在这项工作中，可扩展的和无粘合剂的3D多孔CuS微花（CuS-B）电极通过一种简单的方法与原位硫雕刻在商业铜箔上制备。 所制备的CuS B具有543 mAh g−1的高可逆容量、在60 A g− 1下413 mAh g− 1的优异倍率性能以及超过3600次循环后98.2%容量保持率的出色长期循环稳定性。 3D自支撑多孔结构可以增加离子转移动力学，并提供足够的空间来缓冲重复循环期间的体积膨胀/收缩，从而产生优异的Na存储性能。更重要的是，合成路径简单高效，为大规模储能应用的高性能氧化还原活性电极的设计和开发提供了新的见解。
Copper sulfide (CuS) is considered as a promising sodium storage anode with its high theoretical capacity (558 mAh g−1), low cost and environmental friendliness. However, the development of applicable CuS anodes with high rate and long life is still greatly hindered by the sluggish electronic/ionic transport kinetics and huge volume change during repeated charge/discharge processes. In this work, a scalable and binder‐free 3D porous CuS microflower (CuS‐b) electrode was prepared via a simple method with in situ sulfur engraving on commercial copper foil. The as‐prepared CuS‐b delivers a high reversible capacity of 543 mAh g−1, excellent rate capability of 413 mAh g−1at 60 A g−1and remarkable long‐term cycling stability of 98.2 % capacity retention over 3600 cycles. The 3D self‐supporting porous structure can increase ionic transfer kinetics and provides enough space to buffer the volume expansion/contraction during repeated cycling, resulting in excellent Na storage performances. More importantly, the synthesis path is simple and efficient, which provides new insights for the design and development of high‐performance redox‐active electrodes for large‐scale energy storage applications.