Preparation and characterization of flake graphite/silicon/carbon spherical composite as anode materials for lithium-ion batteries

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• 作者：Jun Lai ; Huajun Guo ; ^{Lai_jun_@126.com} ; Zhixing Wang ; Xinhai Li ; Xiaoping Zhang ; Feixiang Wu ; Peng Yue
• 关键词：Spray drying ; Flake graphite/silicon/carbon composite ; Spherical composite ; Anode material ; Li-ion battery
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：25 July, 2012
• 卷：530
• 期：Complete
• 页码：30-35
• 文件大小：1314 K

摘要

Using nano-Si, glucose and flake graphite of 鈭?.5 渭m 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.