锂镍锰氧LNMO的制备.ppt

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1、第十四届"摇篮杯“北京科技大学大学生课外学术科技作品赛2015材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O4材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O4Advantages:highenergydensities,obtainedeitherbyhighvoltageorhighcapacitySpinelstructurePositiveelectrodemateriaoflithiumbatteriesLiNi0.5Mn1.5O4材料合成化学PPT竞赛Synthesi

2、sofLiNi0.5Mn1.5O4ApproachestosynthesizeSolid-statereactionsSol–geltechnologyCoprecipitationsEmulsiondryingMoltensalttechnologySpraypyrolysis材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O4Co-precipitationorganiccoprecipitationmicrowavesinteringElectrospinningPulsedlaserdepsiti

3、on材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O45SynthesisofprecursorSinteringprocessCo-precipitation材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O46StoichiometricamountsofMn,Li,andNiacetatesweredissolvedinH2Oandstirredfor1h，Oxalic-acidsolutionwasthenaddeddropwiseunderstirring.Thepreci

4、pitatesolutionwasstirredfor1hbeforebeingdriedat50℃overnightwithconstantstirring.Thedriedprecipitatewaspreheatedat500℃for6handthengroundfor30minThepreheatedpowderwaspressedintopellets(20mmdia.andca.5mmthick)andannealedat900℃for24hinairPrecipitateDryingPreheatSinteri

5、ngPreparationProcess材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O47TheadvantagesanddisadvantagesAdvantages:EasytocontrolreactionprocessTheproductofparticlesgenerallysmallanduniformGoodelectrochemicalpropertiesDisadvantage:NeedtoadjusttheproportionofLi,Ni,Mn材料合成化学PPT竞赛Synthes

6、isofLiNi0.5Mn1.5O4OrganiccoprecipitationSchematicIllustrationof8-HydroxyquinolineCoprecipitationRoute材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O4ABNi(Ac)2·6H2OMn(Ac)2·4H2OLiAcambienttemperaturewater8-hydroxyquinoline60°Cethanolsolid−liquiddispersion(brownflocculentprecipit

7、ation)stirfor2hevaporateat80°Cwithoutfiltrationdryinginair100°Cpreheatat470°Cfor5hdarkpowerprecursorPreparationProcess材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O4precursorpellets15MPa10°C/minheating800°C24h1°C/mincoolingSampleQCTocompare,sampleswerepreparedusingsolid-state

8、method(markedasSS)andnormalcoprecipitationmethodwithKOHasprecipitant(markedasHC)aswell.PreparationProcess材料合成化学PPT竞赛SynthesisofLiNi0.5Mn1.5O4SEMi