资源描述：
《09 JAC Influence of heat-treatment temperature on crystal structure,》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、JournalofAlloysandCompounds467(2009)327331Influenceofheat-treatmenttemperatureoncrystalstructure,morphologyandelectrochemicalpropertiesofLiV3O8preparedbyhydrothermalreactionJiaqiangXua,b,∗,HailinZhanga,TaoZhangb,QingyiPanb,YanghaiGuiaaCollegeofMaterialsandChemicalEngineering,ZhengzhouUniversity
2、ofLightIndustry,Zhengzhou450002,ChinabDepartmentofChemistry,CollegeofScience,ShanghaiUniversity,Shanghai200444,ChinaReceived4July2007;receivedinrevisedform26November2007;accepted27November2007Availableonline4December2007AbstractTheLiV3O8sampleswithdifferentmorphologieshavebeensuccessfullyprepa
3、redbyamixedhydrothermalsolsolid-staterouteviathereactionofvanadiumpentoxide(VO)andlithiumhydrate(LiOH)at200◦Cinbasicmediumandsubsequentgelationat100◦Candthermal25treatmentat300550◦C.ThecrystalstructureandmorphologyofthesampleswerecharacterizedbyX-raydiffraction(XRD),specificsurfaceareameasureme
4、ntsandscanningelectronmicroscopy(SEM).Theirelectrochemicalpropertieswereinvestigatedbymeansofconstantcharge/dischargecyclingmeasurement.Theresultsindicatedthatthecalcinationtemperaturehasasignificanteffectonthecrystalstructure,morphology,andspecificsurfaceareaoftheLiV3O8samples,whichconsequently
5、affectstheirelectrochemicalperformancesuchastheinitialcapacityandthecycleability.Thesampleheat-treatedat300◦Cshowsthemorphologyofirregularblockswithlowdegreeofcrystallinityandhighspecificsurfacearea,exhibitinghighinitialdischargecapacityof277.7mAhg−1butafastcapacityfade.Incontrast,thesamplesann
6、ealedathighertemperaturewithperfectlyuniformrod-likemorphologyshowmuchbettercycleperformance.©2007ElsevierB.V.Allrightsreserved.Keywords:Lithium-ionbatteries;Cathodematerial;Hydrothermalprocess;Morphology;Electrochemicalproperties1.Introductiontocontrolthecompositionandhomogeneityoffinalproduct
7、s,andmoltenV2O5wouldalsocausecorrosiontothecrucible.Althoughrechargeablelithiumbatterieshavereceivedexten-Recently,severalsolutionmethodsimprovedwereproposedsiveattentionatbothfundamentalandappliedlevels,further[6,7].Thesolutionmethoddo
