锂二次电池的高温循环性能及其容量损失

970：2009-04-15：(20676152;20876178)：（1984—），，，，，。Biography:LILian-xing(1984—),male,candidateformaster.：11,21,111(1.4100832.410083)：60℃。-(CC-CV)300，（SEM）X（XRD）300，。，，，。，，。：;；；：TM912.9：A：1002-087X(2009)11-0970-04Researchoncycleperformanceandcapacityfadingoflithium-ionsecondarybatteriesLILian-xing1,TANGXin-cun1,2,LUOZhuo1ZENGZhi-wen1,XIAOYuan-hua1CHENJing-bo11.Collegeofchemistryandchemicalengineering,CentralSouthUniversity,ChangshaHunan410083,China;2.StateKeyLaboratoryofPowderMetallurgyCentralSouthUniversity,ChangshaHunan410083,ChinaAbstract:Thecycleperformanceandcapacityfadingoflithium-ionsecondarybatteriescycledbothatRTand60℃werestudied.Thecharge-dischargecycleoflithium-ionbatterieswastestedfor300cyclesatdifferenttemperaturesbyconventionalconstantcurrent-constantvoltage(CC-CV)protocol.ThecharacteristicsofmorphologyandstructureaftercyclewereinvestigatedbySEMandXRD,andtheelectrochemistrypropertieswerestudiedbycharge/dischargecycleandEIS.Theresultsshowthattheinitialcapacityincreases,butcyclestabilityoflithium-ionbatteriesdecreasesandcapacityfadingacceleratesatelevatedtemperatures.Capacityfadingoflithium-ionbatteriesatelevatedtemperaturecanbeattributedprimarilytotheincreaseofelectrochemistrypolarizationofcathodematerialsandthedeteriorationofthemorphologyandstructure,anditgetsevenworseduetothestructurechangeofactivematerialsresultingfromamassofgasproducedatelevatedtemperatures.Keywords:lithium-ionbattery;CC-CV;capacityfade;elevatedtemperatures,。。。、、[1]。45℃[2-3]60℃。60℃。。1950mAhLP063450AR。25℃60℃1C(950mA)(CC-CV)3.0～4.20V1C4.2V4.2V20mA1C3.0V3002009.11Vol.33No.11971LAND-2001T。KYKY-2800SIMENS-D500XCuKαλ＝1.4506nm40kV20mA,4(°)/min,5°～80°。PARSTAT227310mHz～100kHz5mV。2125℃60℃50。15060℃25℃。25℃60℃5096.6%95.5%。15060℃25℃60℃。。225℃60℃3002(a)2(b)。2(a)15060℃25℃。30025℃86.4%60℃70.9%。2(b)930mAh60℃1020mAh300803mAh60℃730mAh60℃25℃。325℃60℃300。60℃。15(SEI)SEI[4]。[5]。2009.11Vol.33No.11972。。-。330060℃25℃25℃。。4SEM。4(a)LiCoO225℃300SEM3000100004(b)LiCoO260℃300SEM300010000。25℃60℃、。/[6]。5。60℃[7]。。Li+、。50060%(LiC6)Li+。[2]。[7]。6LiCoO2XRD6aLiCoO2XRDbc25℃60℃300XRD。6LiCoO2。LiCoO2[8]。LiCoO2XRDLiCoO2。60℃300。[6]。。45℃。2009.11Vol.33No.11973。7300。(Li+Warburg)(Z)45°。Li+/SEI(RΩ)(Rct)。760℃300(Rct)0.29Ω0.45Ω。。。360℃300SEM、XRDEIS。:160℃23、。：[1]SHIMJ,KOSTECKIR,RICHARDSONT.Electrochemicalanalysisforcycleperformanceandcapacityfadingofalithium-ionbatterycycledatelevatedtemperature[J].JPowerSources,2002,112:222-230.[2]ZHANGD,HARANBS,DURAIRAJANA,etal.Studiesoncapacityfadeoflithium-ionbatteries[J].JPowerSources,2000,91:122-129.[3]PAMADASSP,DURAIRAJANA,HARANBS,etal.Studiesoncapacityfadeofspinel-basedli-ionbatteries[J].JElectrochemSoc2002,149(1):A54-A60.[4]VETTERJ,NOV魣KP,WAGNERM,etal.Ageingmechanismsinlithium-ionbatteries[J].JournalofPowerSources,2005,147:269-281.[5],,.LiCoO2[J].,2007,23:1238-1241.[6]RAMADASSP,HARANB,WHITER,etal.CapacityfadeofSony18650cellscycledatelevatedtemperaturesPartII:Capacityfadeanalysis[J].JPowerSources,2002,112:614-620.[7].[J].2006130(6)488-491.[8]LIJ,MURPHYE,WINNICKJ,etal.Studiesonthecyclelifeofcommerciallithiumionbatteriesduringrapidcharge-dischargecycling[J].JPowerSources,2001,102:294-301.《》《》。“”。。《》2009.11Vol.33No.11