A unique sandwich-structured C/Ge/graphene nanocomposite as an anode material for high power lithium ion batteries
A unique sandwich-structured C/Ge/graphene nanocomposite as an anode material for high power lithium ion batteries
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DOI：
10.1039/c3ta13324a
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Guo, Zaiping
中科院分区：
文献类型：
--
作者：
Li, Dan;Seng, Kuok Hau;Guo, Zaiping
采用微波辅助溶剂热反应、碳涂层和热还原法制备了一种独特的夹在石墨烯片之间的锗纳米颗粒C/Ge/石墨烯复合材料。石墨烯片可以有效地抑制二氧化钛纳米粒子的生长和聚集。更重要的是，石墨烯片加上碳涂层，可以缓冲电化学锂反应中锗的体积变化。独特的三明治结构具有高导电性的碳网络，可以提高电极材料的导电性和结构稳定性，为开发新型高性能锂离子电池电极材料提供了一个有前途的策略。
A unique sandwich-structured C/Ge/graphene composite with germanium nanoparticles trapped between graphene sheets is prepared by a microwave-assisted solvothermal reaction followed by carbon coating and thermal reduction. The graphene sheets are found to be effective in hindering the growth and aggregation of GeO2 nanoparticles. More importantly, the graphene sheets, coupled with the carbon coating, can buffer the volume changes of germanium in electrochemical lithium reactions. The unique sandwich structure features a highly conductive network of carbon, which can improve both the conductivity and the structural stability of the electrode material, and exemplifies a promising strategy for the development of new high performance electrode materials for lithium ion batteries.