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1、JournalofTheElectrochemicalSociety,152~6!A1041-A1046~2005!A10410013-4651/2005/152~6!/A1041/6/$7.00?TheElectrochemicalSociety,Inc.ElectrochemicalInvestigationsonCapacityFadingofAdvancedLithium-IonBatteriesafterStoringatElevatedTemperature,zMao-SungWu,*Pin-ChiJuliaChiang,andJung-ChengLinIndust
2、rialTechnologyResearchInstitute,MaterialsResearchLaboratories,Hsinchu310,TaiwanCapacityfadingofadvancedlithium-ionbatteriesafterelevatedtemperaturestoragewasinvestigatedbythree-electrodemeasure-ments.Capacityfadingofabatteryincreasesbyincreasingthestate-of-charge~SOC!duringstorage,especially
3、atelevatedtemperatures.ThereversiblecapacityofabatterysSOC=100%dat60°Cdecreasesfrom820to650mAh~79.3%capacityretention!after60days.Atroomtemperature,abatterySOCinˉuencesthecapacityfadingonlyslightly;after65daysofstorage,thereversiblecapacitydecreasesfrom820to805mAh~98.2%capacityretention!.Ind
4、ividualeffectsbytheanode,cathode,andelectrolyteoncapacityfadingareanalyzedwiththree-electrodeelectrochemicalacimpedance.Themajorcontribution,fromX-rayphotoelectronspectroscopy~XPS!andenergy-dispersivespectroscopyresults,comesfromcathodedegradationasaresultofcobaltdissolutionattheLiCoO2surfac
5、elayer.Aminorcontributioncomesfromthecontinuousreactionsbetweenlithiatedmesocarbonmicrobead~MCMB!electrodeandelectrolytecomponents,whichinturnthickentheSEI?lmandconsumeavailablelithiumions.FromX-raydiffractionandXPSresults,high-temperaturestorageinˉuencesonlythesurfacepropertiesofMCMBandLiCo
6、O2electrodes;bulkpropertiesremainunchanged.?2005TheElectrochemicalSociety.@DOI:10.1149/1.1896325#Allrightsreserved.ManuscriptsubmittedAugust17,2004;revisedmanuscriptreceivedDecember15,2004.AvailableelectronicallyApril21,2005.Inrecentyears,anewtypeoflithium-ionbattery,theadvancedreferenceelec
7、trodemaybeadded,thenmoremechanismsmaybelithium-ionbattery~ALB,withlaminatedaluminumfoilexterior!,studiedandphenomenaunderstood.Therefore,thispaperistoin-hasemergedbecauseofitshighenergydensity,longcyclelife,andvestigatethecapacityfadingofcommercial
