ZnAl-layered double hydroxide nanosheets-coated ZnO@C microspheres with improved cycling performance as advanced anode materials for zinc-based rechargeable batteries
ZnAl-layered double hydroxide nanosheets-coated ZnO@C microspheres with improved cycling performance as advanced anode materials for zinc-based rechargeable batteries
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ZnAl层状双氢氧化物纳米片涂覆的ZnO@C微球作为锌基可充电电池的先进负极材料具有改善的循环性能
DOI：
10.1016/j.jpowsour.2019.03.030
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发表时间：
2019-05
影响因子：
9.2
通讯作者：
Li Quanmin
中科院分区：
文献类型：
--
作者：
Shangguan Enbo;Fu Peiying;Ning Sashuang;Wu Chengke;Li Jing;Cai Xiaowu;Wang Zhenhui;Wang Mingyu;Li Xiaoguang;Li Quanmin
成功制备出高性能Zn-Al层状双氢氧化物纳米片包覆的球形ZnO@C复合材料，用作先进的锌基可充电电池负极材料。有趣的是，具有适当包覆含量的ZnAl层状双氢氧化物的球形ZnO@C-ZnAl层状双氢氧化物（15%）复合材料表现出优异的循环性能、令人满意的体积比容量和增强的高倍率性能。在 1C/1C 下 400 次循环和 1C/5C 下 200 次循环后，ZnO@C-ZnAl 层状双氢氧化物 (15%) 的容量保持率提高了 81.6%。相比之下，原始 ZnO 在 1C/1C 下循环 200 次后容量保持率较低，仅为 46.3%。这些性能的提高主要归功于Zn-Al层状双氢氧化物表面涂层和碳原位掺杂的协同效应。包覆Zn-Al层状双氢氧化物纳米片可以改变ZnO阳极的“溶解-沉积”过程，并且掺杂的C可以增强其电子电导率，最终导致电化学电阻降低、反应可逆性提高、结构稳定性增强。因此，球形ZnO@C-ZnAl层状双氢氧化物（15%）复合材料被认为是一种有前途的锌基充电电池先进负极材料。
High-performance Zn-Al layered double hydroxide nanosheets-coated spherical ZnO@C composite is successfully fabricated for use as advanced anode materials of zinc-based rechargeable batteries. It is interestingly found that the spherical ZnO@C-ZnAl layered double hydroxide (15%) composite with a proper coated content of ZnAl layered double hydroxide shows a superior cycling performance, satisfactory volume specific capacity and enhanced high-rate properties. After 400 cycles at 1C/1C and 200 cycles at 1C/5C, the ZnO@C-ZnAl layered double hydroxide (15%) exhibits enhanced capacity retention of 81.6%. In contrast, the pristine ZnO shows low capacity retention of only 46.3% after 200 cycles at 1C/1C. These performance improvements can be mainly attributable to the synergistic effect of the surface coating with Zn-Al layered double hydroxide and in-situ doping with carbon. The coated Zn-Al layered double hydroxide nanosheets can modify the“dissolution-deposition” process of ZnO anode and the doped C can enhance its electronic conductivity, eventually leading to the reduced electrochemical resistance, improved reaction reversibility, and enhanced structural stability. As a result, it is believed that the spherical ZnO@C-ZnAl layered double hydroxide (15%) composite is a promising advanced anode material for zinc-based rechargeable batteries.
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