绿色NaCl模板合成的纳米多孔硅碳电极提高电池循环寿命
绿色NaCl模板合成的纳米多孔硅碳电极提高电池循环寿命
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作者：
Xu Fan;Xiangping Jiang;Wei Wang;Zhaoping Liu
多孔硅/碳（Si/C）结构对提高硅基负极材料的电化学循环性能具有重要意义。目前多孔硅阳极的制备通常依赖于复杂的化学腐蚀工艺，不可避免地存在污染问题。本文采用喷雾干燥和碳化工艺成功制备了纳米多孔Si/C复合材料。使用环境友好的NaCl作为牺牲模板用于产生嵌入的纳米孔，其可以通过常规洗涤过程容易地去除。所制备的纳米多孔Si/C阳极表现出约900 mAh g（-1）的高可逆比容量，100次循环后的容量保持率为78.2%。该方法为制备电化学性能优良的多孔硅基阳极材料提供了一条简单、环保的途径，对工业化生产具有重要意义。(C)2016爱思唯尔B. V.保留所有权利。
Porous silicon/carbon (Si/C) structure has been proved of great help to enhance the electrochemical cycling performance of Si-based anode materials. Current fabrication of porous Si based anodes usually relies on the complicated chemical etching process with unavoidable pollution problem. Herein, a nanoporous Si/C composite was successfully fabricated by a facile spray drying and carbonization process. The environmentally benign NaCl is used as the sacrificing template for the generation of embedded nanopores, which can be easily removed by routine washing process. The as-prepared nanoporous Si/C anode exhibits a high reversible specific capacity of around 900 mAh g(-1) with 78.2% capacity retention after 100 cycles. This synthetic method paves a simple and environment-friendly way to build porous Si based anode with improved electrochemical performance which is significantly important for the industrial production. (C) 2016 Elsevier B.V. All rights reserved.