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1、AdvancedMaterialsResearchVols.335-336(2011)pp1364-1367Onlineavailablesince2011/Sep/02atwww.scientific.net©(2011)TransTechPublications,Switzerlanddoi:10.4028/www.scientific.net/AMR.335-336.1364SynthesisofLiFePO4/CbyCarbonThermalReductionMethodanditsElectrochemicalProperties
2、ab,*cdChaoChen,YunZhang,FuWang,JizhouZouCollegeofMaterialsScienceandEngineering,SichuanUniversity,Chengdu610064,P.R.Chinaabcdsuucc_rium@163.com,scuzy@163.com,wfu2005@163.com,zjzscu@sina.comKeywords:Lithium-ionbattery,LiFePO4/C,cathodematerials,carbonthermalreduction,short-
3、timesinteringAbstract:LiFePO4/Cweresuccessfullysynthesizedbycarbonthermalreductionmethodatsinteringtemperatureof650°Cfor12h,usingLi2CO3,FePO4andthreeorganiccarbonsources(citricacid,glucoseandascorbicacid)asstartingmaterials.Thecrystalstructure,morphologyandelectrochemicalp
4、erformanceswerecharacterizedbyX-RayDiffraction(XRD),ScanningElectronMicroscope(SEM)andCharge/DischargeTest.Theresultsshowedthatthesampleusingglucoseascarbonsourcewasshuttletypeporousparticleswithborediameterfrom50to100nm,charge/dischargetestshowedthatthesamplehadnotonlyhig
5、hinitialdischargecapacityof155.1mAh/gat0.1C(17mA/g),and144.8mAh/gat1C,butalsoexcellentrateperformance.Moreover,thecapacitieslosewhichwasonly0.97%after10cyclingnumberat1Cindicateitsgoodcyclingstability.IntroductionLiFePO4,whichwasfirstintroducedbyJ.B.Goodenough[1],havebeenc
6、onsideredtobethemostpromisingcathodematerialforpotentialuseinlarge-scaleapplicationssuchashybridelectricvehicles(HEV)andenergystoragedevices,duetoitsadvantageofcompetitivelyhightheoreticalcapacity,goodcyclestability,excellentthermalstabilityandlowtoxicity[1-3].However,them
7、ainproblemofLiFePO4isitslowintrinsicelectronicconductivity,whichhindersitswideuse.Thereareseveralpossiblemeanstoenhanceitselectronicperformanceincludingreductionoftheparticlesize[4],carbonormetalcoating[5-6]anddopingwithsupervalencecations[7].RecentlyCarbonThermalReduction
8、(CRT)methodhasbeenbecameageneralapproachtoproductLiFePO4/C[8-9].CarbonsurroundingLiFePO4e
