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Preparation of Kevlar-derived carbon fibers and their anodic performances in Li secondary batteries
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ko, Ki Seok | - |
dc.contributor.author | Park, Chul Wan | - |
dc.contributor.author | Yoon, Seong-Ho | - |
dc.contributor.author | Oh, Seung M. | - |
dc.date.accessioned | 2009-07-24T08:03:46Z | - |
dc.date.available | 2009-07-24T08:03:46Z | - |
dc.date.issued | 2001-07-26 | - |
dc.identifier.citation | Carbon 2001;39:1619–25. | en |
dc.identifier.issn | 0008-6223 | - |
dc.identifier.uri | https://hdl.handle.net/10371/5832 | - |
dc.description.abstract | We report here the preparation of Kevlar-derived carbon fibers and the preliminary results on their anodic performances in Li secondary batteries. The single- or two-step carbonization process is employed for the preparation. In the single-step process, the Kevlar flocks are heat-treated under Ar atmosphere from 25 to 800°C with a heating rate of 5°C min−1, but an additional intermediate heating at a fixed temperature between 330 and 510°C for 2 h is applied in the two-step preparation. The two-step carbonization allows a higher carbon yield than that achieved in the single-step one (ca. 36%). In particular, a maximum yield (ca. 50%) is observed with an intermediate heating at 400–410°C. The infrared study indicates that the higher carbon yield achieved in the two-step process is indebted to the formation of condensed/cross-linked polyaromatic molecules during the intermediate heating period, which seemingly alleviates the volatile loss in the subsequent higher temperature heating. The Kevlar-derived carbon fibers exhibit the charge–discharge behaviors that are commonly observed in non-graphitizable carbons. Here, the carbon made by the two-step process (intermediate heating at 410°C) delivers a higher discharge capacity than the single-step ones. In particular, a notably high capacity near zero volts is observed in the two-step carbon that is associated with the Li+ removal from the micropores. The higher population of micropores in the two-step carbons may be explained by the enriched formation of cross-linked polyaromatics during the intermediate heating. | en |
dc.description.sponsorship | This work was supported by the Korea Science and Engineering Foundation (98-2-03-01-01-2). | en |
dc.language.iso | en | en |
dc.publisher | Elsevier | en |
dc.subject | Carbon fibers | en |
dc.subject | Heat treatment | en |
dc.subject | Electrochemical analysis | en |
dc.subject | Carbon yield | en |
dc.subject | Electrochemical properties | en |
dc.title | Preparation of Kevlar-derived carbon fibers and their anodic performances in Li secondary batteries | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 고기석 | - |
dc.contributor.AlternativeAuthor | 박철완 | - |
dc.contributor.AlternativeAuthor | 윤성호 | - |
dc.contributor.AlternativeAuthor | 오승모 | - |
dc.identifier.doi | 10.1016/S0008-6223(00)00298-0 | - |
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