Electrochemical properties of PAN-based carbon fibers as anodes for rechargeable lithium ion batteries

Citation
Jk. Lee et al., Electrochemical properties of PAN-based carbon fibers as anodes for rechargeable lithium ion batteries, CARBON, 39(9), 2001, pp. 1299-1305
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CARBON
ISSN journal
0008-6223 → ACNP
Volume
39
Issue
9
Year of publication
2001
Pages
1299 - 1305
Database
ISI
SICI code
0008-6223(2001)39:9<1299:EPOPCF>2.0.ZU;2-F
Abstract
Polyacrylonitrile(PAN)-based carbon fibers were tested as anodes for Lithiu m ion rechargeable batteries. PAN-based fibers were first stabilized under tension in air at about 200 degreesC (stabilization tension) and then carbo nized in different gas environments (carbonization atmospheres) at heat tre atment temperatures (HTT) between 700 and 1500 degreesC. The carbon fiber e lectrodes were prepared at various conditions using the stabilized PAN fibe rs and then their electrochemical characteristics were investigated. The PA N-based carbon fiber prepared at an oxidative stabilization tension of ca. 10 MPa showed the highest discharge capacity in our experimental range. We found that the effective diffusion coefficient of lithium in the carbon fib er electrode was influenced by the carbonization environment employed. The electrochemical intercalation process depended on mass transfer of lithium into carbon layer which is rate-determining during the electrode charge-dis charge process. The effect of HTT on discharge capacity varied depending on the combined effect of both the amount of intercalation sites available an d the electric conductivity of the carbon fiber used. (C) 2001 Elsevier Sci ence Ltd. All rights reserved.