Surface modification of LiNi0.5Mn1.5O4 by ZrP2O7 and ZrO2 for lithium-ion batteries.pdf

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1、JournalofPowerSources195(2010)2909–2913ContentslistsavailableatScienceDirectJournalofPowerSourcesjournalhomepage:www.elsevier.com/locate/jpowsourShortcommunicationSurfacemodificationofLiNi0.5Mn1.5O4byZrP2O7andZrO2forlithium-ionbatteriesH.M.Wua,I.Belharouaka,A

2、.Abouimranea,Y.-K.Sunb,K.Aminea,∗aChemicalSciencesandEngineeringDivision,ArgonneNationalLaboratory,9700SouthCassAve.,Argonne,IL60439,USAbDepartmentofChemicalEngineering,CenterforInformationandCommunicationMaterials,HanyangUniversity,Seoul133-791,SouthKoreaar

3、ticleinfoabstractArticlehistory:ThespinelLiNi0.5Mn1.5O4hasbeensurfacemodifiedseparatelywith1.0wt.%ZrO2andZrP2O7fortheReceived13October2009purposeofimprovingitscycleperformanceasacathodeina5-Vlithium-ioncell.Althoughthemodi-Accepted5November2009ficationsdidnotc

4、hangethecrystallographicstructureofthesurface-modifiedsamples,theyexhibitedAvailableonline14November2009◦bettercyclabilityatelevatedtemperature(55C)comparedwithpristineLiNi0.5Mn1.5O4.ThematerialthatwassurfacemodifiedwithZrO2gavethebestcyclingperformance,only4%

5、lossofcapacityafter150Keywords:cyclesat55◦C.ElectrochemicalimpedancespectroscopydemonstratedthattheimprovedperformanceLithium-ionbatteriesoftheZrO2-surface-modifiedLiNi0.5Mn1.5O4isduetoasmalldecreaseinthechargetransferresistance,LiNi0.5Mn1.5O4indicatinglimite

6、dsurfacereactivityduringcycling.DifferentialscanningcalorimetryshowedthattheZrO2coatingZrP2O7coatingZrO2-modifiedLiNi0.5Mn1.5O4exhibitslowerheatgenerationandhigheronsetreactiontemperaturecomparedtothepristinematerial.Theexcellentcyclingandsafetyperformanceoft

7、heZrO2-modifiedLiNi0.5Mn1.5O4electrodewasfoundtobeduetotheprotectiveeffectofhomogeneousZrO2nano-particlesthatformontheLiNi0.5Mn1.5O4,asshownbytransmissionelectronmicroscopy.PublishedbyElsevierB.V.1.IntroductionvoltageplateausinLi/LiMxMn2−xO4cellswerefoundtobe

8、stronglydependentonthetypeoftransitionmetals(M)andtheircon-GreatinteresthasariseninuseofLiMn2O4spinelsascathodetent.Amongthosematerials,LiNi0.5Mn1.5O4isofspecialinterestmaterialsforlithiumsecond