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1、天津理工大學(xué)碩士學(xué)位論文高容量富鋰相層狀固溶體鋰離子電池正極材料姓名:楊瑞娟申請學(xué)位級別:碩士專業(yè):材料物理與化學(xué)指導(dǎo)教師:張聯(lián)齊201201AbstractInrecentyears,inthebackgroundofshortageofglobaloilresourcesandtheworseningoftheenvironment,lithiumionbatterybegantobeusedinelectricCars,energ

2、ystoragepowerstationandintelligentpower酣d,etc,SOaSteducedependenceonoilandthereliefofairpollutionForsuchapplications,lithiumionbatteriesmusthavehi曲energydensityandpowerdensitywithgoodsafetyandenvironmentalfiiendlinessBut

3、currentpositivematerialsarehardtomeetthehi曲densityandhi曲powerdensityrequirementsInthiscontext,thelayeredLi—rich“l(fā)zMl—z02(Misoneormorethanonetypeoftransitionmetalelements,20)materialhasbeentheresearchfocusbecauseofitshigh

4、capacity,excellentcycleabilityandnewchargeanddischargemechanismTheycallbethemostpossiblecandidateofcathodematerialsfornextgenerationLiionbattery(300Wh/kg)Tllemaincontentsofthisthesis,centeredonthetetrahedralphasediagramo

5、fLiNi02LiC002LiMn02Li2Mn03,areasfollows:FirstlywiththeaidofatetrahedralphasediagramofLiNi02LiC002一LiMn02一Li2Mn03,wedesignedaseriesofnewcathodematerialsofLilzMlZ02(M=NilmnComMnn,z=02),whichcanberewrittenasLil2(C004Mno4)1。

6、y(Ni04Mn04)x(Ni02Mno6)y02(Oxy1)solidsolutionsExploratorysynthesisofthosedesignedmaterialsviaasimplecombustionmethodwasalsoattempted,followedbypreliminarystructuralandelectrochemicalcharacterizationsXRDandSEMresultsshowed

7、thatcalciningtemperaturehasimportanteffectsonthestructureandmorphologyofmaterialsAllthematerialspreparedat950℃wereapurephasewithwelldevelopedlayeredstructure,whichwellsupportedourjudgementonthetetrahedralphasediagramofLi

8、Ni02LiC002LiMn02Li2Mn03PreliminaryelectrochemicalcharacterizationsindicatedthatmaterialsCanexhibitdifferentelectrochemicalpropertiesdependingonmaterialscompositionSecondlytwocompositionsofLil2(C004Mno4)1xy(Nio4Mno4)x(Nio

9、2Mno6)y02(Og蛭1)seriesmaterials(Lil2Ni013Coo13Mn05402andLil2Ni015Coo2Mno4502)wereselectedtoinvestigatetheeffectofsynthesisrouteonmaterialsperformancesAhydroxidecoprecipitationroutewasusedtooptimizematerialssynthesisandcom

10、paredwiththecombustionmethodofacetatesComparativestudyindicatedthatthematerialssynthesizedbyCOprecipitationmethodpresentedhighercrystallinitywithbetterlayeredcharacteristics,highercharge/dischargecapacityandslightlyimpro

11、vedcycleabilitythanthosepreparedbycombustionmethodofacetatesFurtherinvestigationofrateperformanceonthematerialspreparedviaCOprecipitationroutedemonstratedgoodratecapabilityofmaterialsandimprovedcycleabilitywitllincreased

12、rateFinallyconsideringthepossibleimportantimpactsofLicontentonperformancesoflayeredLirichLilzMlz02(Misoneormorethanonetypeoftransitionmetalelements,20)materials,twohydroxideprecursorsofthematerialswithcompositionsofx=0,y

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