Electrochemical performance of pyrolytic carbon-coated natural graphite spheres

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	Electrochemical performance of pyrolytic carbon-coated natural graphite spheres
	H. L. Zhang; S. H. Liu; F. Li; S. Bai; C. Liu; J. Tan; H. M. Cheng
	2006
发表期刊	Carbon
ISSN	0008-6223
卷号	44 期号:11 页码:2212-2218
摘要	Natural graphite (NG) spheres were coated by pyrolytic carbon from the thermal decomposition Of C2H2/Ar at 950 degrees C in a fluidized bed reactor. Scanning electron microscopy and secondary electron focused ion beam (FIB) images clearly showed that a pyrolytic carbon layer with a thickness of similar to 250 nm was uniformly deposited on the surface of the NG spheres. Electrochemical performance measurements for the original and coated NG spheres as anode materials of a lithium-ion battery indicated that the first coulombic efficiency and cyclability were significantly improved in the coated sample. The reasons for this were investigated by analyzing structural characteristics, specific surface area, pore size distribution, and solid electrolyte interphase (SEI) film. Using a FIB workstation, we demonstrated, by cross-section imaging of a coated NG sphere that had experienced five electrochemical cycles, that the SEI film formed on the non-graphitic pyrolytic carbon surface became thinner (60-150 nm) and more uniform in composition compared with that on the surface of uncoated NG spheres; and the formation of an "internal SEI film" inside the NG spheres was also remarkably suppressed due to the uniform coating of pyrolytic carbon. (C) 2006 Published by Elsevier Ltd.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;cheng, hm (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;cheng@imr.ac.cn
关键词	Battery Carbon Electrochemical Properties Microstructure Lithium Ion Batteries Anode Material Electrode Morphology
URL	查看原文
WOS记录号	WOS:000239295500015
引用统计	被引频次：105[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34693
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. L. Zhang,S. H. Liu,F. Li,et al. Electrochemical performance of pyrolytic carbon-coated natural graphite spheres[J]. Carbon,2006,44(11):2212-2218.
APA	H. L. Zhang.,S. H. Liu.,F. Li.,S. Bai.,C. Liu.,...&H. M. Cheng.(2006).Electrochemical performance of pyrolytic carbon-coated natural graphite spheres.Carbon,44(11),2212-2218.
MLA	H. L. Zhang,et al."Electrochemical performance of pyrolytic carbon-coated natural graphite spheres".Carbon 44.11(2006):2212-2218.