Facile hydrothermal synthesis of double shelled Si@SnO2@C as advanced cathode for high-temperature lithium batteries
Facile hydrothermal synthesis of double shelled Si@SnO2@C as advanced cathode for high-temperature lithium batteries
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轻松水热合成双壳Si@SnO2@C作为高温锂电池的先进正极
DOI：
10.1016/j.jallcom.2020.157661
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发表时间：
2021-03
影响因子：
6.2
通讯作者：
Hua Hou
中科院分区：
文献类型：
--
作者：
Yanyan Zhang;Yuhong Zhao;Yongqiang Niu;Jingxia Ren;Hua Hou
精心制备的具有核壳结构的硅基复合材料极大地优化了硅电极的体积膨胀问题。但大多数硅基电极材料的制备过程繁琐，去除模板剂所用的溶剂对环境有害，影响了硅基电极材料的发展和应用。本文采用水热法一步合成了一种新型双壳结构的Si@SnO2@C复合材料，并通过X射线衍射分析和X射线光电子能谱分析进行了验证。研究了Si@SnO2@C复合材料作为高温电池阴极在Li-Mg-B合金/LiNO 3-KNO 3/Si@SnO2@C电池体系中的放电行为。结果表明，所制备的Si@SnO2@C复合材料在10 mA cm− 2的电流密度下具有优异的放电性能，200 °C下的比容量可达到782.12 mAh g− 1。即使在300 °C的更高温度下，容量仍然可以达到613.67 mAh g−1，这些良好的性能主要归功于出色的结构特性。该合成工艺简单、经济，为制备先进的硅基电极材料提供了一种可行的替代方法，以缓解剧烈的体积膨胀。
The elaborately prepared Si-based composites with core-shell structure have greatly optimized the issues of Si electrode volume expansion. However, the preparation processes of most of them are tedious and the solvents used to remove templates is harmful, which affects the development and application of Si-based electrode materials. Herein, a novel double-shelled Si@SnO2@C composite is successfully designed in one-step by hydrothermal method and verified by X-ray diffraction analysis combined with X ray photoelectron spectroscopy analysis. As the cathode of high-temperature battery, the discharge behavior of Si@SnO2@C composite in the Li–Mg–B alloy/LiNO3–KNO3/Si@SnO2@C battery system has been carried out. It is demonstrated that the as-prepared Si@SnO2@C composite has excellent discharge performance at current densities of 10 mA cm−2and the specific capacity can be achieved 782.12 mAh g−1at 200 °C. Even at a much higher temperature of 300 °C, the capacity can still reach 613.67 mAh g−1, and these favorable properties are mainly due to outstanding structure characteristics. The synthesis process is simple and economical, which provides a feasible alternative method for preparation of advanced silicon-based electrode materials to alleviate violent volume expansion.
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