Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO2 at high voltage |
(a) Charge/discharge curves and (b) specific capacity and Coulombic efficiency vs. cycle number for the Li/LiPF6–EC:DMC (1:1)/LiFePO4 cell at a charge/discharge rate of 0.2/0.2 C at room temperature; and (c) charge/discharge curves and (d) specific capacity and Coulombic efficiency vs. cycle number for the Li/LiFSI–KFSI ( χ LiFSI : χ KFSI = 0.41 : 0.59)/LiFePO4 cell at a charge/discharge rate of 0.2/0.2 C at 80 °C. |
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