材料科学
阳极
复合数
多孔性
锂(药物)
化学工程
纳米颗粒
硅
多孔硅
集聚经济
缓冲器(光纤)
热稳定性
复合材料
纳米技术
冶金
电极
化学
物理化学
内分泌学
工程类
电信
医学
计算机科学
作者
Jiaming Zhang,Jingjing Tang,Xiangyang Zhou,Ming Jia,Juan Yang,Min Jiang,Tingjie Hu,Juan Yang
标识
DOI:10.1002/celc.201801313
摘要
Abstract Fabricating porous Si via magnesiothermic reduction is an effective way to tackle the volume expansion of Si anodes. However, the agglomeration of Si due to the local heat accumulation during the thermal reduction process severely limits its lithium storage capacity. Here, we propose a simple approach to synthesize optimized porous Si/SiC composite (pSi/SiC) spheres via modifying the precursor SiO 2 of magnesiothermic reduction. After heat treatment process, in‐situ generated SiC uniformly dispersed among silicon nanoparticles, playing a crucial role in decreasing local heat accumulation, sequentially maintaining the stability of the porous spherical structure. This method not only optimized pore distribution of porous Si, but also enhanced the buffer effect of SiC. Finally, the as‐prepared pSi/SiC exhibits superior lithium storage performance (1653.4 mAh g −1 and 1446.7 mAh g −1 at 0.5 A g −1 and 1 A g −1 after 100 cycles, 1022 mAh g −1 at 2 A g −1 after 400 cycles, and 420 mAh g −1 at 5 A g −1 even after 2000 cycles). This work can provide an inspirational idea to prepare other optimized porous Si‐based anode materials through introducing various buffer materials.
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