一步溶剂热法快速制备超细CoSn2纳米晶/石墨烯复合材料及其改进的电化学性能
首发时间:2012-11-29
摘要:在本工作中,通过一步溶剂热法成功合成了CoSn2纳米晶/石墨烯复合材料。X射线衍射,X射线光电子能谱,拉曼及红外测试表明CoSn2的形成和氧化石墨还原成石墨烯是反应过程中同时进行的。透射电镜观察表明直径约2-4 纳米的CoSn2纳米晶均匀附着在石墨烯上。相比纯CoSn2,CoSn2/石墨烯复合材料显示出了明显改进的电化学性能。电化学性能的改进是由于石墨烯不仅在复合材料中充当导电网络,起到固定、分散颗粒的作用,而且也在充放电过程中抑制体积膨胀。
关键词: 锂离子电池 CoSn2/石墨烯 负极材料 溶剂热合成
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Facile synthesis of ultrafine CoSn2 nanocrystals anchored on graphene by one-pot route and the improved electrochemical Li-storage properties
Abstract:In this work, we succeeded in the synthesis of CoSn2-nanocrystals/graphene-nanosheets (CoSn2/G) hybrid by a facile in situ one-pot solvothermal route. X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectra results revealed the formation of CoSn2 and the reduction of graphite oxide (GO) to graphene during the one-pot process. Transmission electron microscopy observation indicated that the spheric CoSn2 nanocrystals with a uniform size of 2?4 nm are anchored on graphene. The electrochemical tests showed that the CoSn2/G hybrid exhibits obviously improved electrochemical properties compared to bare Co-Sn alloy. The enhancement in the electrochemical properties could be attributed to the introduction of graphene that not only constructs two-dimensional conductive networks but also disperses and confines the CoSn2 nanocrystals, besides the buffering effect for the large volume changes.
Keywords: Li-ion batteries CoSn2/Graphene Anode Solvethermo route
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一步溶剂热法快速制备超细CoSn2纳米晶/石墨烯复合材料及其改进的电化学性能
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