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1、锂电池容量分析AnalysisofthecauseoflithiumbattetycapacitydecayLithiumionbatteryembeddedreactionoccursbetweentwoelectrodeswithdifferentembeddingenergy,andtoobtainthebestperformance,batterycapacitythanthetwohostelectrodeshouldkeepabalaneedvalue・Inlithium-ionbat
2、teries,thebalaneeofcapacityisexpressedasapositivemassratio,namely:Gammam=m+/-=AxC-/AyC+TypeinCreferstothetheoryofcoulomb'scapacityofelectrode,Ax,Ayreferstoembedthecathodeandanoderespectivelythenumberofstoichiometriclithiumion.Asyoucanseefromthetop,the
3、qualityofthetwopolesdependsontheamountofcoulombcapacityandtheirrespectivereversiblelithiumions.Generallyspeaking,thelowerqualityislessthantheuseofthenegativemateria1.Alargermassratiomaybeasafetyhazardduetothenegativeelectrodebeingcharged.Overall,thebe
4、stbatteryperformanceisinoptimalquality・ForanidealofLi一ionbatterysystem,thecapacitybalancewithintheircycledoesnotchange,eachcycleoftheinitialcapacitytoacertainvalue,butinfactitwasmuchmorecomplex.Anycanproduceorconsumelithiumionorelectronsideeffectscoul
5、dleadtobatterycapacitybalancechanges,oncethebatterycapacitybalancechanges,thischangeisirreversible,andcanbeaccumulatedthroughmanytimescycle,seriousimpactonbatteryperformanee.Inlithiumionbattery,inadditiontolithiumiontotakeofftheembeddedREDOXreactionoc
6、curs,therearealotofsideeffects,suchaselectrolytedecomposition,activesubstancesdissolved,lithiummetaldeposition,etc・，asshowninfigure1.Arora[3],suchastheprocessandthehalfcelldischargecapacityattenuationcurvecontrast,sowecanclearlyseethebatteryworkwhenth
7、epossibilityofcapacityattenuationandthereasons,asshowninfigure2.One,achargeTheoverchargedreactionofthegraphiteanode:Whenthebatteryisovercharged,thelithiumioniseasily-reducedtothenegativesurface:thelithium++e(s),thedepositedlithiumcoatingonthenegatives
8、urface,blockstheembeddingofthelithium.Reduceddischargeefficiencyandcapacitylossdueto:Thecirculationoflithiumcanbereduced;ThedepositedmetallithiumreactswiththesolventortheelectrolytereactiontoformLi2CO3,LiFOrotherproducts;Thelithiummetalisusual
