Electrochemical performance of polygonized carbon nanofibers as anode materials for lithium-ion batteries-中国期刊网

摘要 Carbonnanofiberswithapolygonalcrosssection(P-CNFs)synthesizedusingacatalyticchemicalvapordeposition(CCVD)technologyhavebeeninvestigatedforpotentialapplicationsinlithiumbatteriesasanodematerials.P-CNFsexhibitexcellenthigh-ratecapabilities.Atacurrentdensityashighas3.7and7.4A/g,P-CNFscanstilldeliverareversiblecapacityof198.4and158.2mAh/g,respectively.Toimprovetheirfirstcoulombicefficiency,carbon-coatedP-CNFswerepreparedthroughthermalvapordeposition(TVD)ofbenzeneat900℃.Theelectrochemicalresultsdemonstratethatappropriateamountofcarboncoatingcanimprovethefirstcoulombicefficiency,thecyclingstabilityandtherateperformanceofP-CNFs.Aftercarboncoating,P-CNFsgainaweightincreaseapproximatelyby103wt%,withitsfirstcoulombicefficiencyincreasingfrom63.1to78.4%,anddeliverareversiblecapacityof197.4mAh/gatacurrentdensityof3.7A/g.Afterdozensofcycles,thereisnosignificantcapacitydegradationatbothlowandhighcurrentdensities.

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Electrochemical performance of polygonized carbon nanofibers as anode materials for lithium-ion batteries

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Electrochemical performance of polygonized carbon nanofibers as anode materials for lithium-ion batteries

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