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ID:70415218
大小:46.96 KB
页数:11页
时间:2021-11-22
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1、LithiumionbatteryElectrodeLithium-ionbatteryelectrodeisacompositeofactivematerial,polymericbinder,andconductiveadditive.Cooperationamongthedifferentcomponentsplaysasubtleandimportantroleindeterminingthephysicalandelectrochemicalpropertiesoftheelectrode.Anoptimizedelectrode
2、couldtakefulladvantageoftheactivematerialtosatisfyapplicationrequirements.AsaLi-intercalationmaterialintheelectrode,thephysicochemicalpropertyofactivematerialplaysaveryimportantroleintheperformanceoflithium-ionbattery.Furthermore,non-activematerialandpreparationprocessofel
3、ectrodealsohavesignificanteffectontheelectrochemicalperformance,safetyperformanceandproductioncostoflithium-ionbattery.Therequirementsofasuccessfulelectrolyte.First,itshouldisolatetheelectronandiontransportpathwaysinthecell.Second,itshouldpromoteion-pairdissociationandsele
4、ctivelyfacilitatetransportoftheactiveionicspeciesThird,itmustpenetrateandwettheporous,chemicallyheterogeneoushybridmaterialsthatconstitutetheelectrodesandseparator.Fourth,itshouldnotleak,combustorvaporizeduringcellstorageoroperation.Fifth,itshouldbechemicallyrobustinthepre
5、senceoftheelectrodesandtheirredoxproducts.Finally,itmustitselfbestableinthenormaloperatingvoltagerangefortheelectrochemicalcell.Significantly,thesefeaturesmustbemaintainedoverthousands,eventensofthousandsofcharge–dischargecyclesspanningmanyyearsofcelloperation.protectionof
6、electrodeWorksonLi–airbatteriesemployingaqueouselectrolytesrelyuponthehighsolubilityofLi2O2(Lithiumperoxide)inwatertoavertproblemswithprematurefoulingoftheporouscathodeTheprimaryadvantageofthesedesignsishatthecathodeissubmergedinwaterandthedischargereactionproductissoluble
7、inwater,sothiseliminatesproblemsofcathodeclogging,expansionandelectricalconductivitythatresultfromtheuseofanaproticelectrolyte.anodeTheall-aqueousLi–airbatteryutilizesaninertceramicsolid-stateelectrolytecoatingontheanode,whichprotectsitfromwater,butissufficientlyconductive
8、forionstofacilitatetheshuttlingreaction.ImprovementEncapsulationofthesulfurintoaporouscarbonfram
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