阳极
石墨烯
材料科学
复合数
锂(药物)
氧化物
化学工程
电流密度
纳米颗粒
纳米技术
粒子(生态学)
复合材料
电极
化学
冶金
物理化学
内分泌学
工程类
量子力学
地质学
物理
海洋学
医学
作者
Jinyan Dai,Jiang Liao,Minyi He,Mengmeng Yang,Kaipeng Wu,Weitang Yao
出处
期刊:Chemsuschem
[Wiley]
日期:2019-11-13
卷期号:12 (23): 5092-5098
被引量:23
标识
DOI:10.1002/cssc.201902839
摘要
One of the key challenges for the development of lithium-ion batteries is the preparation of high-performance anode materials. In this paper, a micro/nanostructured Si@SnS2 -rGO composite is reported in which Si nanoparticles with a particle size of 30 nm are electrostatically anchored on a 3D reduced graphene oxide (rGO) network and mixed with SnS2 . The step-wise lithiation/delithiation of SnS2 provided space-constraining effects to accommodate volume expansion and particle aggregation, thereby alleviating the volume expansion of Si during cycling as well as enhancing the structural stability, whereas the rGO in the 3D network stabilized the composite. The composite had a high specific capacity of 1480.1 mAh g-1 after 200 cycles at a current density of 200 mA g-1 and a high stability at rates of 200-3000 mA g-1 . The capacity attenuation after cycling was only 89.18 %. A stable specific capacity (425.5 mAh g-1 ) was achieved after 600 cycles at a current density of 3000 mA g-1 . Therefore, the micro/nanostructured Si@SnS2 -rGO composite is a promising anode material for use in lithium-ion batteries.
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