Scalable preparation of porous silicon nanoparticles and their application for lithium-ion battery anodes
Scalable preparation of porous silicon nanoparticles and their application for lithium-ion battery anodes
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DOI：
10.1007/s12274-013-0293-y
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发表时间：
2013-03-01
期刊：
影响因子：
9.9
通讯作者：
Zhou, Chongwu
中科院分区：
文献类型：
--
作者：
Ge, Mingyuan;Rong, Jiepeng;Zhou, Chongwu
纳米结构硅作为锂离子电池的阳极材料已经产生了巨大的兴奋;然而，需要更多的努力来生产可扩展的纳米结构硅，并具有良好的性能。在这里，我们提出了一种直接制备多孔硅纳米粒子作为一种新的纳米结构硅使用一种新的两步方法相结合的控制硼掺杂和简易的化学蚀刻。多孔硅纳米颗粒已成功用作高性能锂离子电池阳极，在1 A/g的电流速率下实现了约1，400 mA中心点h/g的容量，在2 A/g下实现了1，000 mA中心点h/g的容量，并且当与还原的氧化石墨烯组合并测试超过200次循环时稳定运行。我们将整体良好的性能归因于多孔硅和还原氧化石墨烯的组合，多孔硅可以在循环期间适应大的体积变化并提供电解质可接近的大表面积，还原氧化石墨烯可以用作多孔硅纳米颗粒的弹性和导电基质。
Nanostructured silicon has generated significant excitement for use as the anode material for lithium-ion batteries; however, more effort is needed to produce nanostructured silicon in a scalable fashion and with good performance. Here, we present a direct preparation of porous silicon nanoparticles as a new kind of nanostructured silicon using a novel two-step approach combining controlled boron doping and facile electroless etching. The porous silicon nanoparticles have been successfully used as high performance lithium-ion battery anodes, with capacities around 1,400 mA center dot h/g achieved at a current rate of 1 A/g, and 1,000 mA center dot h/g achieved at 2 A/g, and stable operation when combined with reduced graphene oxide and tested over up to 200 cycles. We attribute the overall good performance to the combination of porous silicon that can accommodate large volume change during cycling and provide large surface area accessible to electrolyte, and reduced graphene oxide that can serve as an elastic and electrically conductive matrix for the porous silicon nanoparticles.