Instability of lithium bis(fluorosulfonyl)imide (LiFSI)–potassium bis(fluorosulfonyl)imide (KFSI) system with LiCoO2 at high voltage
Zhang Shua), Li Wen-Juna), Ling Shi-Ganga), Li Hong†a), Zhou Zhi-Binb), Chen Li-Quana)
       
(a) Charge/discharge curves and (b) specific capacity and Coulombic efficiency vs. cycle number for the Li/LiPF6-EC:DMC (1:1)/LiCoO2 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)/LiCoO2 cell at a charge/discharge rate of 0.2/0.2 C at 80 °C.