Reinvestigation on the state-of-the-art nonaqueous carbonate electrolytes for 5 V Li-ion battery applications

摘要: Abstract The charging voltage limits of mixed-carbonate solvents for Li-ion batteries were systematically investigated from 4.9 to 5.3 V in half-cells using Cr-doped spinel cathode material LiNi0.45Cr0.05Mn1.5O4. stability conventional carbonate electrolytes is strongly related the and properties materials de-lithiated state. This first time report that based on mixtures EC linear (DMC, EMC DEC) can be cycled up 5.2 V LiNi0.45Cr0.05Mn1.5O4 long-term cycling, where their performances are similar. discharge capacity increases with cutoff reaches highest at 5.2 V. retention about 87% after 500 cycles 1C rate all three when between 3.0 V When 5.3 V, EC-DMC still shows good cycling performance but EC-EMC EC-DEC show faster fading. have much better capability than EC-DEC. first-cycle irreversible loss voltage. “inactive” conductive carbon also partly associated low Coulombic efficiency high voltages due electrolyte decomposition possible PF6- anion intercalation.