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过程工程学报 2004
SuppressingtheImpedanceRiseofLiNi0.8Co0.2O2/GraphiteCellsbyAl,TiandMgDopingKeywords: rechargeablebatteries,doping,cathode,impedance Abstract: Theresearchonutilizinglithium-ionbatterieswithLiNi0.8Co0.2O2-basedcathodeforhybridelectricvehiclesisintensivelyunderwayinseveralnationallaboratoriesofUSDepartmentofEnergy.TheimpedanceofLiNi0.8Co0.2O2/graphitelithium-ioncellsisobservedtoexperienceasubstantialriseduringacceleratedcalendarlifestorage,duemainlytothesignificantincreaseoftheinterfacialresistanceonthecathodeside.BymeansofelectrochemicalmeasurementsandACimpedancespectroscopy,itisfoundthatdopingtheLiNi0.8Co0.2O2cathodewithsmallamountofAl,TiandMgcaneffectivelysuppressthisimpedancerise.PossiblemitigationofoxidizingabilityofNi4+duetoAl,TiandMgdopingisproposedtoachievethisimpedancestabilization.
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