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1、'~JOURNAl.OFPOWERsggRcllELSEVIERJournalofPowerSources68(1997)463-470TheuseofinsituFourier-transforminfraredspectroscopyforthestudyofsurfacephenomenaonelectrodesinselectedlithiumbatteryelectrolytesolutionsD.Aurbach*,O.ChusidDepartmentofChemtstry,Bar-llan
2、University,RamatGan52900,IsraelAccepted13January1997AbstractThispaperpresentssomeexamplesofsurfacestudiesofnoblemetalsandLielectrodesinLibatteryelectrolytesolutionsusinginsituFF-IRspectroscopictechniques.Theseexamplesincludethestudyofamixtureofsolvents,
3、theroleofthereductionofsaltinthebuild-upofsurfacefilmsontheelectrodesandtheimpactofcontammantssuchastracesofoxgenandwater.Thetechniquesincludedmultipleandsingleinternalreflectancemodesandexternalreflectance(SNIFTIRS-type)mode.Thefollowingconclusionswere
4、drawnfromthisstudy:(i)saltscontainingthe-SOzCF~grouparemuchmorereactiveonLJthanLiAsF~.TheirreductiondominatesthesurfacechemistrydevelopedonLiinetherealsolutions;(fi)waterreductiononLiinwet1,3-dioxolanesolutionmaynottbrmstableLiOHfilmsduetothefurtherreac
5、tionofthehydroxygroupwiththesolvent;(iii)inspiteofJtslowsolubihty,oxygendissolvedinpropylenecarbonateandtelrahydrofuransolu-tionshassomeimpactonthesurfacechemistrydevelopedonLiinthesesolutions(probablyduetoLi20formation).©1997ElsevierScienceS.A.Key~or&.
6、Lithiumbatteries;Electrolytes;Surfacephenomena1.IntroductionAlkylcarbonatesarereducedonLitoROCO2Lispecies,ethersarereducedtoalkoxyspecies(ROLi)andestersarereducedtocarboxylates(RCOOLi).InadditiontotheaboveDuringthepasttwodecadesagreatdealofefforthasbeen
7、expendedworldwideinidentifyingsurfacefilmsformedoncomponents,thesurfacefilmsinthevarioussystemsincludeLi,andotheractivemetals,inpolaraproticsystems.X-raysaltreductionproducts(LihalidessuchasLiC1,LiF,depend-photospectroscopy(XPS)[1],Augerelectronspectros
8、copyingonthesaltused)andspeciessuchasLi20,Li3N,LiOH(AES)[2]andsecondaryionmassspectroscopy(SIMS)andLizCO3resultingfromthereactionofLiwiththeatmos-[3]werefirstusedforthestudyofsurfacefilmsformedonphericcontaminantsO2,N2,H20andCO2,
