新型锂离子电池负极材料的制备与电化学性能的分析-preparation and electrochemical performance analysis of novel cathode materials for lithium ion batteries.docx

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2018-06-03 发布于上海
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新型锂离子电池负极材料的制备与电化学性能的分析-preparation and electrochemical performance analysis of novel cathode materials for lithium ion batteries.docx

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新型锂离子电池负极材料的制备与电化学性能的分析-preparation and electrochemical performance analysis of novel cathode materials for lithium ion batteries

StudyofElectrochemicalPerformanceofNewTypeNegativeElectrodeMaterialsforLithium-ionBatteriesAbstractTheover-exploitingofthefossilpowersuchascoalandpetroleumnotonlyleadtothedecliningofthereserveleveldaybyday,butalsoresultsingreenhouseeffectandseriousdamagetotheecologicalenvironment.TheincidentoftheoilspillintheGulfofMexicothisyearhascausedseriousconcerntotheworldonthedevelopmentofcleanenergy.Ifbatteryenergysupersededfossilpower,therewouldbeagreatreductioninbothgreenhousegasemissionsandthedependencyonoilimports,whichisofimportanteconomicandstrategicmeaningtoourcountry.Incomparisontoothersecondarybatteries,Li-ionBatteryhasmanyadvantagessuchashighvoltageandspecificcapacity,longcyclinglifeandenvironmentalfriendliness.Li-ionBatteryisthemostpositivetobeusedinhighpowerEVbattery.However,thepresentcommercializedcarbonanodematerialshavereachedtheirlimitandcouldnolongermeettherequirementsofEV.Todiscoveranewanodematerialwhichisofbettersafety,higherspecificcapacitanceandlongercyclinglifehasbecomethefocusonLi-ionBatteryresearchatpresent.AnataseTiO2hasbecomeoneofthedesirablechoicesforanodematerialsforLithium-ionBatteriesbecauseofitsmanyadvantagessuchasgoodcycleperformanceandsafety,goodresistancetooverchargeandetc.InthispaperwehavepreparedanataseTiO2byhydrothermalprocessatlowtemperaturesandstudiedtheinfluencesofthehydrothermalreactionfactors(thetemperatures,timeandreactantconcentration)onthemorphologyoftheproducts.TheinvestigationshowsthatwhenthevolumeratiobetweenTiOSO4,glycerol,absolutealcoholandethyletheris1:16:40:11andreactiontemperatureisbetween105℃and120℃,uniformsized,well-dispersedspherical/core-shellTiO2isobtained.Bymeansofcontrollingdifferentreactiontime,wediscoveredthatthesynthesisofcore-shellTiO2fallsintotwophases,i.e.theformationofinnercrystalnucleusandthegrowthofouterchips.Weperformedtheroastingexperimentsuponthecore-shellTiO2at700℃undervacuum.WithXRD、TEMandelementalanalysertechniqueswegettoknowthatthecarboncontentinthisproductisabout18.35%,TEMpicturesshowthatthecore-shel