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Preparation of Kevlar-derived carbon fibers and their anodic performances in Li secondary batteries

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dc.contributor.authorKo, Ki Seok-
dc.contributor.authorPark, Chul Wan-
dc.contributor.authorYoon, Seong-Ho-
dc.contributor.authorOh, Seung M.-
dc.date.accessioned2009-07-24T08:03:46Z-
dc.date.available2009-07-24T08:03:46Z-
dc.date.issued2001-07-26-
dc.identifier.citationCarbon 2001;39:1619–25.en
dc.identifier.issn0008-6223-
dc.identifier.urihttps://hdl.handle.net/10371/5832-
dc.description.abstractWe 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.sponsorshipThis work was supported by the Korea Science and Engineering Foundation (98-2-03-01-01-2).en
dc.language.isoenen
dc.publisherElsevieren
dc.subjectCarbon fibersen
dc.subjectHeat treatmenten
dc.subjectElectrochemical analysisen
dc.subjectCarbon yielden
dc.subjectElectrochemical propertiesen
dc.titlePreparation of Kevlar-derived carbon fibers and their anodic performances in Li secondary batteriesen
dc.typeArticleen
dc.contributor.AlternativeAuthor고기석-
dc.contributor.AlternativeAuthor박철완-
dc.contributor.AlternativeAuthor윤성호-
dc.contributor.AlternativeAuthor오승모-
dc.identifier.doi10.1016/S0008-6223(00)00298-0-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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