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1、Availableonlineatwww.sciencedirect.comJournalofPowerSources174(2007)400407Ontheelectrochemicalandthermalbehavioroflithiumbis(oxalato)borate(LiBOB)solutionsL.Larush-Asraf,M.Biton,H.Teller,E.Zinigrad∗,D.AurbachDepartmentofChemistry,Bar-IlanUniversity,Ramat-Gan52900,IsraelAvailableonli
2、ne29June2007AbstractInrecentyears,lithiumbis(oxalato)borate,LiB(C2O4)2(LiBOB)hasbeenproposedasanalternativesalttothecommonlyusedelectrolyte,LiPF6.ThereisevidenceoftheenhancedstabilityofLi-ionbatteryelectrodesinsolutionsofthissalt,duetoauniquesurfacechemistrydevelopedinLiBOBsolutions
3、.ThepresentstudyisaimedatfurtherexploringtheelectrochemicalandthermalpropertiesofLiBOBsolutionsinmixturesofalkylcarbonateswithnon-activemetal,graphiteandlithiumelectrodes.FTIRspectroscopy,XPS,EQCM,insituAFMimaging,andDSCwereusedinconjunctionwithstandardelectrochemicaltechniques.Thes
4、tudyalsoincludedacomparisonbetweenLiBOBandLiPF6solutions.ThedevelopmentofafavorablesurfacechemistryinLiBOBsolutionsthatprovidesbetterpassivationtoLiandLi-graphiteelectrodeswasclearlyevident.©2007ElsevierB.V.Allrightsreserved.Keywords:LiBOB;Graphite;EQCM;AFM;Thermalanalysis1.Introduc
5、tion[5].Thelatterishighlysensitivetoproticcontaminants,andanycontactbetweenthisgasandproticsubstancesformsHF.InLiPF6isthecommonlyusedelectrolyteinLi-ionbatteries[1].fact,allLiPF6solutionsareunavoidablycontaminatedbyHFItssolutionsinalkylcarbonatemixturescanreachahighspecific[6].Thepre
6、senceofHFinsolutionshasadetrimentalimpactconductivity(>10mScm−1),anditdoesnotsignificantlyaffectonthesurfacechemistryofbothanodesandcathodes.Itbadlytheelectrochemicalwindowsofitssolutions,whichareusuallyaffectsthepassivationofgraphiteelectrodes[7]andpromoteslimitedbysolventreactions(
7、bothanodicandcathodic).Theper-thedissolutionoftransitionmetalionsfromcathodematerialsformanceofbothlithiatedgraphiteanodesandcommonlyused[8,9].Infact,thepresenceofHFinLiPF6solutionsmaybecon-cathodes(LixMO2,M=Mn,Co,Nimixturesoftransitionmet-sideredasoneofthemainreasonsforthelimitedpe
8、rformanceals,etc.)i
