石墨
材料科学
复合数
锂(药物)
碳纤维
阳极
鳞片
硅
热解
法拉第效率
复合材料
化学工程
纳米技术
电极
冶金
化学
医学
物理化学
内分泌学
工程类
作者
Jun Lai,Huajun Guo,Zhixing Wang,Xinhai Li,Xiaoping Zhang,Feixiang Wu,Yue Peng
标识
DOI:10.1016/j.jallcom.2012.03.096
摘要
Using nano-Si, glucose and flake graphite of ∼0.5 μm as raw materials, flake graphite/silicon/carbon composite is successfully synthesized via spray drying and subsequent pyrolysis. The samples are characterized by XRD, SEM, TEM and electrochemical measurements. The composite is composed of flake graphite, nano-Si and amorphous glucose-pyrolyzed carbon and presents good spherical appearance. Some micron pores arising from the decomposition of glucose exist on the surface of the composite particles. The composite has a high reversible capacity of 602.7 mAh/g with an initial coulombic efficiency of 69.71%, and shows nearly the same cycleability as the commercial graphite in 20 cycles. Both the glucose-pyrolyzed carbon and the micron pores play important roles in improving the cycleability of the composite. The flake graphite/silicon/carbon composite electrode is a potential alternative to graphite for high energy-density lithium ion batteries.
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