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	Preparation and electrochemical lithium intercalation performance of segmented carbon nanofibers
	Wu, GT ; Wu GT(吴国涛) ; Wang, M ; Wang M(王淼) ; Li, ZH ; Li ZH(李振华) ; Chen, WX ; Chen WX(陈卫祥) ; Xu, ZD ; Xu ZD(徐铸德) ; Li, WZ ; Li WZ(李文铸) ; Chen, MH ; Chen MH(陈茂惠) ; You, JK ; You JK(尤金跨) ; Lin, ZG ; Lin ZG(林祖赓)
	2003
关键词	carbon nanofibers chemical vapor deposition Li-ion battery negative electrode materials
英文摘要	Segmented carbon nanofibers were prepared by pyrolysis of acetylene on foam Ni at 600 and 700degreesC in a fixed bed flowed-reactor. The morphology, microstructure and lithium insertion properties of these carbon nanofibers were investigated by TEM, XRD, Raman and electrochemical methods. Through TEM observations, it was found that this kind of carbon nanofibers was composed of lens-like segments with nearly equal separation stacking along the nanofiber axis. When the reaction temperature was 600degreesC, segmented carbon nanofibers were the major production. However, when the reaction temperature increased to 700degreesC, the content of segmented carbon filaments decreased and their diameter became smaller. The crystallite size d(002) and L-c were determined by the 002 carbon Bragg peak of XRD patterns using the Bragg and Scherrer formulas. The intensity ratios of the 1350 cm(-1) line and the 1580 cm(-1) line (R =I-D/I-G) was used to evaluate the L-a value, which was inversely proportional to the effective crystallite size in the direction of the graphite plane (L-a). With the reaction temperature increased, the d(002) value decreased, L-a and L-c values increased, which indicated the degree of crystallinity increased. Segmented carbon nanofibers were used as positive electrodes of C/Li cells. The first charge capacities of C/Li cells were 480 and 300 mAh/g for samples produced at 600 and 700degreesC, respectively. The samples at 600degreesC showed capacities higher than the theoretical value of graphite, which was attributed to accommodation of more. lithium at the edge of graphene layers and on the surface of graphene layers according to the mechanisms of lithium insertion in carbons prepared by low-temperature pyrolysis of hydrocarbons. As confirmed by the XRD and Raman spectra, the samples at 700degreesC had larger L-a and L-c, which led to the capacity decreasing.
语种	中文
出版者	SCIENCE CHINA PRESS
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/12089]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Wu, GT,Wu GT,Wang, M,et al. Preparation and electrochemical lithium intercalation performance of segmented carbon nanofibers[J],2003.
APA	Wu, GT.,吴国涛.,Wang, M.,王淼.,Li, ZH.,...&林祖赓.(2003).Preparation and electrochemical lithium intercalation performance of segmented carbon nanofibers..
MLA	Wu, GT,et al."Preparation and electrochemical lithium intercalation performance of segmented carbon nanofibers".(2003).

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