Growth of silicon/carbon microrods on graphite microspheres as improved anodes for lithium-ion batteries

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	Growth of silicon/carbon microrods on graphite microspheres as improved anodes for lithium-ion batteries
	Zhu, XY ; Chen, H ; Wang, YH ; Xia, LH ; Tan, QQ ; Li, H ; Zhong, ZY ; Su, FB ; Zhao, XS
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2013
卷号	1 期号:14 页码:4483
ISSN号	2050-7488
通讯作者	Zhu, XY (reprint author), Qingdao Univ, Coll Chem & Environm Engn, Qingdao 266071, Peoples R China.
中文摘要	We report a facile chemical vapor deposition (CVD) method to grow silicon/carbon (Si/C) microrods on the surface of commercial graphite microspheres (GMs) to prepare Si/C/GM composite materials as Li-ion battery anodes. Dimethyldichlorosilane and toluene were used as Si and C precursors, respectively. The CVD temperature and time, as well as the mechanism of materials growth were investigated. The samples were characterized by using X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. It was found that the obtained Si/C/GM composites with an urchin-like morphology are composed of Si particles, amorphous carbon, and graphite. The CVD conditions have a significant impact on the morphology and electrochemical performance of the composite materials. The composite prepared under the optimum CVD conditions, namely at 900 degrees C for 5 h, displayed the best anode properties with a specific capacity of 562.0 mA h g(-1) at a current density of 50 mA g(-1), much higher than that of GMs (361.0 mA h g(-1)), and a good cycling performance (i. e., a reversible capacity of 590.5 mA h g(-1) after 50 cycles). The improved electrochemical performance is attributed to the incorporation of Si, together with the formation of a Si/C microrod network, which connects the GMs and buffers the volume change of Si during lithium ion insertion/extraction. The work provides a simple and low-cost route to enhance the performance of commercial graphite anode materials for Li-ion batteries.
资助信息	National Natural Science Foundation of China [51272252, 21031005]; State Key Laboratory of Multiphase Complex Systems of China [MPCS-2012-A-09]; Chinese Academy of Sciences; Australian Research Council (ARC) [FT100100879]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57058]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhu, XY,Chen, H,Wang, YH,et al. Growth of silicon/carbon microrods on graphite microspheres as improved anodes for lithium-ion batteries[J]. JOURNAL OF MATERIALS CHEMISTRY A,2013,1(14):4483.
APA	Zhu, XY.,Chen, H.,Wang, YH.,Xia, LH.,Tan, QQ.,...&Zhao, XS.(2013).Growth of silicon/carbon microrods on graphite microspheres as improved anodes for lithium-ion batteries.JOURNAL OF MATERIALS CHEMISTRY A,1(14),4483.
MLA	Zhu, XY,et al."Growth of silicon/carbon microrods on graphite microspheres as improved anodes for lithium-ion batteries".JOURNAL OF MATERIALS CHEMISTRY A 1.14(2013):4483.