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1、NANOLETTERSSynthesisofSingleCrystallineSpinel2009Vol.9,No.3LiMn2O4NanowiresforaLithiumIon1045-1051BatterywithHighPowerDensityEijiHosono,TetsuichiKudo,ItaruHonma,HirofumiMatsuda,andHaoshenZhou*EnergyTechnologyResearchInstitute,NationalInstituteofAdVancedIndustrialScienceandTechnology,Umezono,1-1-1,
2、Tsukuba,305-8568,JapanReceivedNovember10,2008;RevisedManuscriptReceivedDecember22,2008ABSTRACTHowtoimprovethespecificpowerdensityoftherechargeablelithiumionbatteryhasrecentlybecomeoneofthemostattractivetopicsofbothscientificandindustrialinterests.ThespinelLiMn2O4isthemostpromisingcandidateasacathode
3、materialbecauseofitslowcostandnontoxicitycomparedwithcommercialLiCoO2.Moreover,nanostructuredelectrodeshavebeenwidelyinvestigatedtosatisfysuchindustrialneeds.However,thehigh-temperaturesinteringprocess,whichisnecessaryforhigh-performancecathodematerialsbasedonhigh-qualitycrystals,leadsthelargegrai
4、nsizeandaggregationofthenanoparticleswhichgivespoorlithiumionbatteryperformance.Sothereisstillachallengetosynthesizeahigh-qualitysingle-crystalnanostructuredelectrode.Amongallofthenanostructures,asinglecrystallinenanowireisthemostattractivemorphologybecausethenonwovenfabricmorphologyconstructedbyt
5、hesinglecrystallinenanowiresuppressestheaggregationandgraingrowthathightemperature,andthepotentialbarrieramongthenanosizegrainscanbeignored.However,thereportedsinglecrystallinenanowireisalmostthemetaloxidewithananisotropiccrystalstructurebecausethecubiccrystalstructuresuchasLiMn2O4cannoteasilygrow
6、intheone-dimentionaldirection.Herewesynthesizedhigh-qualitysinglecrystallinecubicspinelLiMn2O4nanowiresbasedonanovelreactionmethodusingNa0.44MnO2nanowiresasaself-template.ThesesinglecrystallinespinelLiMn2O4nanowiresshowhighthermalstabilitybecausethenanowirestructureismaintainedafterheatingto800°Cf
7、or12handexcellentperformanceathighratecharge-discharge,suchas20A/g,withbotharelativeflatcharge-dischargeplateauandexcellentcyclestability.Introduction.Theelectricvehicle(EV)usingarecharge-ingfromincreasedlithiumio
