Effect of temperature on lithium-ion intercalation kinetics of LiMn1.5Ni0.5O4-positive-electrode mat
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LiMn1.5Ni0.5O4issynthesizedbyasolgelmethodandtheintercalationkineticsaspositiveelectrodeforlithiumionbatteriesisinvestigatedbyEIS.LiMn1.5Ni0.5O4particlespreparedviasolgelprocesspossessspinelphasewithFd-3mspacegroup.Thecharge-transferresistance,theexchangecurrentdensityandthesolid-phasediffusionarefoundasafunctionoftemperature.Theapparentactivationenergyoftheexchangecurrent,thechargetransfer,andthelithiumdiffusioninsolidphasearealsodetermined,respectively.Thisresultindicatesthattheeffectofthetemperatureonthecellcapacityandthecurrentdependenceofthecapacityresultsmainlyfromtheenhancementofthelithiumdiffusionatelevatedtemperatures.ItcanbeconcludedthatLiMn1.5Ni0.5O4cellhasabadratecyc领performanceatelevatedtemperaturesbeforeanymodificationduetothehighdiffusionapparentactivationenergy.TherelevanttheoreticalelucidationsthusprovideussomeusefulinsightsintothedesignofnovelLiMn1.5Ni0.5O4-basedpositive-electrodematerials.
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