資源描述：
《Dynamic Structural Changes at LiMn2O4Electrolyte Interface》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、PublishedonWeb10/12/2010DynamicStructuralChangesatLiMn2O4/ElectrolyteInterfaceduringLithiumBatteryReactionMasaakiHirayama,HedekazuIdo,KyungSuKim,WoosukCho,,KazuhisaTamura,JunichiroMizuki,andRyojiKanno*DepartmentofElectronicChemistry,InterdisciplinaryGraduateSchoolofScienceandEngin
2、eering,TokyoInstituteofTechnology,4259Nagatsuta,Midori-ku,Yokohama226-8502,Japan,andJapanAtomicEnergyAgency,SynchrotronRadiationResearchCenter,KansaiResearchEstablishment,1-1-1KoutoSayo-choSayo-gun,Hyogo679-5148,JapanReceivedJuly5,2010;E-mail:kanno@echem.titech.ac.jpAbstract:Gaini
3、ngathoroughunderstandingofthereactionsontheelectrodesurfacesoflithiumbatteriesiscriticalfordesigningnewelectrodematerialssuitableforhigh-power,long-lifeoperation.AtechniquefordirectlyobservingsurfacestructuralchangeshasbeendevelopedthatemploysanepitaxialLiMn2O4thin-?lmmodelelectro
4、deandsurfaceX-raydiffraction(SXRD).EpitaxialLiMn2O4thin?lmswithrestrictedlatticeplanes(111)and(110)aregrownonSrTiO3substratesbypulsedlaserdeposition.InsituSXRDstudieshaverevealeddynamicstructuralchangesthatreducetheatomicsymmetryattheelectrodesurfaceduringtheinitialelectrochemical
5、reaction.Thesurfacestructuralchangescommencewiththeformationofanelectricdoublelayer,whichisfollowedbysurfacereconstructionwhenavoltageisappliedinthe?rstchargeprocess.Transmissionelectronmicroscopyimagesafter10cyclescon?rmtheformationofasolidelectrolyteinterface(SEI)layeronboththe(
6、111)and(110)surfacesandMndissolutionfromthe(110)surface.The(111)surfaceismorestablethanthe(110)surface.TheelectrodestabilityofLiMn2O4dependsonthereactionrateofSEIformationandthestabilityofthereconstructedsurfacestructure.7-111.IntroductionextensivelyinvestigatedbyX-raydiffraction(
7、XRD),neutron11,1213,14diffraction,nuclearmagneticresonance,andRamanIntercalationreactionsarechemicalreactionsinwhichguestspectroscopy.15LiMnOhasthespinelstructure(spacegroup24ionsareinsertedinandextractedfromgapsinahostlatticeFd3jm)inwhichLiandMncationsrespectivelyoccupywithoutsig
8、ni?cantlymodifyingthelatticeitsel
