材料科学
石墨烯
石墨
阳极
复合数
硅
锂(药物)
阴极
纳米颗粒
化学工程
复合材料
纳米技术
电化学
电极
光电子学
化学
物理化学
内分泌学
工程类
医学
作者
Song Zhu,Jie Zhou,Yong Guan,Wenlong Cai,Yingyue Zhao,Yuanchao Zhu,Linqin Zhu,Yongchun Zhu,Yitai Qian
出处
期刊:Small
[Wiley]
日期:2018-10-16
卷期号:14 (47)
被引量:89
标识
DOI:10.1002/smll.201802457
摘要
Abstract To better couple with commercial cathodes, such as LiCoO 2 and LiFePO 4 , graphite‐based composites containing a small proportion of silicon are recognized as promising anodes for practical application in lithium‐ion batteries (LIBs). However, the prepared Si/C composite still suffers from either rapid capacity fading or the high cost up to now. Here, the facile preparation of hierarchical graphene‐scaffolded silicon/graphite composite is reported. In this designed 3D structure, Si nanoparticles are homogeneously dispersed on commercial graphites and then uniformly encapsulated in the hierarchical graphene scaffold. This hierarchical structure is also well characterized by the synchrotron X‐ray computed nanotomography technique. When evaluated as anodes for LIBs, the hierarchical composite, with the Si weight ratio of 5 wt%, exhibits a reversible capacity of 559 mA h g −1 at 75 mA g −1 , suggesting an unprecedented utilization of Si up to 95%. Even at 372 mA g −1 , the composite can still maintain a high capacity retention of 90% after 100 cycles. Coupled with the LiFePO 4 cathode, the full cell shows the high capacity of 114 mA h g −1 at 170 mA g −1 . The excellent Li‐storage properties can be ascribed to the unique designed hierarchical structure.
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