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1、LawrenceBerkeleyNationalLaboratoryLawrenceBerkeleyNationalLaboratoryTitle:CharacterizationofSEIlayersonLiMn2O4cathodeswithin-situspectroscopicellipsometryAuthor:Lei,JingleiLi,LingjieKostecki,RobertMuller,RolfMcLarnon,FrankPublicationDate:08-30-2004PublicationInfo:LawrenceBerkeleyNati
2、onalLaboratoryPermalink:http://www.escholarship.org/uc/item/8k07b7xbeScholarshipprovidesopenaccess,scholarlypublishingservicestotheUniversityofCaliforniaanddeliversadynamicresearchplatformtoscholarsworldwide.CharacterizationofSEILayersonLiMn2O4CathodeswithIn-situSpectroscopicEllipsom
3、etryzJingleiLei*,LingjieLi,RobertKostecki*,RolfMuller**,FrankMcLarnon**EnvironmentalEnergyTechnologiesDivision,LawrenceBerkeleyNationalLaboratory,Berkeley,California94720,USA*ElectrochemicalSocietyActiveMember.**ElectrochemicalSocietyFellow.zEmail:R_Kostecki@lbl.gov1AbstractInsituspe
4、ctroscopicellipsometrywasemployedtostudytheinitialstageofSEIlayerformationonthin-filmLiMn2O4electrodes.ItwasfoundthattheSEIlayerformedimmediatelyuponexposureoftheelectrodetoEC/DMC(1:1byvol)1.0MLiPF6electrolyte.TheSEIlayerthicknessthenincreasedinproportiontoalogarithmicfunctionofelaps
5、edtime.Incomparison,theSEIlayerthicknessonacycledelectrodeincreasedinproportiontoalinearfunctionofthenumberofcycles.Keywords:Li-ionbattery,LiMnO4cathode,Ellipsometry,SEIlayer2IntroductionItiswellknownthatboththeanode(negativeelectrode)andcathode(positiveelectrode)inLi-ionbatteriesare
6、almostcoveredwithapassivesurfacelayer,whichisgenerallycalledthesolidelectrolyteinterphase(SEI).Peled(1979)introducedtheideaoftheSEIlayeronalkaliandalkalineearthmetalsinorganicelectrolytes[1].SEIlayerformationhasbeenobservedforvariouselectrodematerialssuchasLifoil,carbon,andtransition
7、metaloxides[2-12].TheSEIlayerplaysakeyroleintheelectrochemicalperformanceandcalendarlifeofLi-ionbatteriesbecauseitpreventstheelectrodesurfacefromfurtherreactingwiththeelectrolytecomponents,therebyincreasingthecellimpedanceanddecreasingitscyclingefficiency[13].DuetoitsimportantroleinL
8、i-ionbatteri
