Anode performance of vapor-grown carbon fibers in secondary lithium-ion batteries
Journal Article
·
· Journal of the Electrochemical Society
- Osaka National Research Inst. (Japan)
- Nikkiso Company Ltd., Shizuoka (Japan). Research and Development Center-Shizuoka Plant
Chopped vapor-grown carbon fibers (VGCFS) were studied as anodes for secondary lithium ion batteries using a 1 mol/dm{sup 3} LiClO{sub 4} in a 1:1 (by volume) mixture of ethylene carbonate (EC) and diethylcarbonate (DEC) electrolyte. VGCFs were prepared from hydrocarbons by a vapor-grown method and chopped to ca. 10 {mu}m length. Three different diameters of the VGCFS, 1, 2, and 3 {mu}m (1GWH, 2GWH, and 3GWH, respectively) were used. The VGCFs chopped after graphitization (the 2A method-VGCFs) displayed a higher capacity than those chopped before (the 1A method-VGCFs). In particular, 2GWH-2A gave a capacity of 363 mAh/g carbon, 1.6-fold higher than the capacity of 2GWH-1A; this is almost equal to the theoretical intercalation capacity of an ideal graphite (LiC{sub 6}). The cyclic voltammogram of 2GWH-2A showed the most significantly different profile from that of natural graphite among all of the VGCFs. It is suggested that a new structural change is induced in the well-graphitized VGCFs during the chopping process that affects the lithium storage reaction.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 64790
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 4 Vol. 142; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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