Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO2 at high voltage |
SEM micrographs of (a)–(c) pristine LiCoO2 and (d)–(f) LiCoO2 electrode surfaces after 20 charge-discharge cycles for Li/LiFSI–KFSI ( χ LiFSI: χ KFSI = 0.41: 0.59)/LiCoO2 cell at a charge/discharge rate of 0.2/0.2 C at 80 °C. |
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