LiFePO4的几种实现模式(韩国)课件.ppt

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1、7/30/20211리튬이차전지의양극재료인LiFePO4의고출력향상TheimprovementofratecapabilityinLiFePO4ascathodematerialinlithiumionbatteriesSeungM.OhElectrochemicalEnergyStorage&ConversionLab.7/30/20212Introduction7/30/20213CathodeMaterials’PropertiesLiCoO2LiMn2O4LiFePO4StructureLayeredSpinelOlivin

2、eOperatingvoltage4V4V3.5VTheoreticalcapacity273mAh/g148mAh/g170mAh/gPracticalcapacity160mAh/g120mAh/g150mAh/gElectricalconductivity~10-3S/cm~10-4S/cm~10-7S/cmDiffusivity~10-9cm2/s~10-7cm2/s~10-16cm2/sThermalstabilityUnstableUnstableStableToxicityHighLowLowPriceExpensiveC

3、heapCheap7/30/2021Objectives4HowcanweovercomethedisadvantagesofLiFePO4?-Lowelectricalconductivity,ionicconducitivy-Poorratecapability7/30/20215MethodstosolvethelowratecapabilityPart1:BlendingcathodeofLiFePO4+LiMn2O4Part2:Celloperationathightemp.7/30/20216Part1:Blendingca

4、thodeofLiFePO4+LiMn2O47/30/20217Ratecapabilityofsinglematerial5C/1C=83%5C/1C=29%7/30/20218RatecapabilityofblendedcathodeLMOC-LFPLMO40LFP602C/1C97%50%96%5C/1C83%<1%83%Cut-off:3.0V5C/1C=83%7/30/20219Electricalconductivity–ChangebyLMOaddition7/30/202110Capacityexertionmecha

5、nismVoltage(Vvs.Li/Li+)Currentdensity(mA/g)-800-83.63.63.04.3ConstantCurrentConstantCurrentConstantVoltageNew-typedischargeprofileConstantvoltageregionat3.6V:LMO-discharge,C-LFP–noreaction7/30/202111LMOLFP5C/1C98%74%Proportionofeachcomponent’scapacityIntroductionofnew-ty

6、pedischargeprofiletoLMO40LFP60.Capacityexertionmechanism7/30/202112Summary1TheimprovementofratecapabilitybyblendingTheelectricalconductivityproblemofLiFePO4wasimprovedbyaddingLiMn2O4.LiMn2O4servesasconductingaidstowardLiFePO4.-LiMn2O4exertsmostofit’scapacitywhenitisblend

7、edwithLiFePO4.7/30/202113Part2:Celloperationathightemp.7/30/2021CycleperformancewithLiBOB14ElectrolyteCapacityretentionafter50cycle@25oCCapacityretentionafter50cycle@85oCCapacityretentionafter50cycle@120oCLiBOB/EC:DMC10087LiBOB/EC:DEC1008786LiBOB/PC1008792LiBOB/γBL100

8、77897/30/2021Theeffectofcarboncoating15SampleCapacityretentionafter50cycle@85oCCapacityretentionafter