摘要
Insituchemicaloxidationpolymerizationofpyrroleonthesurfaceofsulfurparticleswascarriedouttosynthesizeasulfur/polypyrrole(S/PPy)nanocompositewithcore-shellstructure.Thecompositewascharacterizedbyelementalanalysis,X-raydiffraction,scanning/transmissionelectronmicroscopy,andelectrochemicalmeasurements.XRDandFTIRresultsshowedthatsulfurwelldispersedinthecore-shellstructureandPPystructurewassuccessfullyobtainedviainsituoxidativepolymerizationofpyrroleonthesurfaceofsulfurparticles.TEMobservationrevealedthatPPywasformedandfixedtothesurfaceofsulfurnanoparticleafterpolymerization,developingawell-definedcore-shellstructureandthethicknessofPPycoatinglayerwasintherangeof20-30nm.Inthecomposite,PPyworkedasaconductingmatrixaswellasacoatingagent,whichconfinedtheactivematerialswithintheelectrode.Consequently,theaspreparedS/PPycompositecathodeexhibitedgoodcyclingandrateperformancesforrechargeablelithium/sulfurbatteries.TheresultingcellcontainingS/PPycompositecathodeyieldsadischargecapacityof1039mAhg-1attheinitialcycleandretains59%ofthisvalueover50cyclesat0.1Crate.At1Crate,theS/PPycompositeshowedgoodcyclestability,andthedischargecapacitywas475mAhg-1after50cycles.
出版日期
2014年05月15日(中国期刊网平台首次上网日期,不代表论文的发表时间)