fig3

Figure 3. Electrochemical performance of the Li||NCM85 batteries with the base electrolyte and LiDFOB-containing electrolyte. (A) Typical voltage profiles of Li||NCM85 batteries with different electrolytes. (B) Cyclic stability of batteries at 1 C in the voltage range of 3.0-4.3 V at selected electrolytes. GITT curves and corresponding overpotential of (C) charging process and (D) discharging process after 150 cycles. (E) Cyclic stability of batteries at 1 C with a cut-off voltage of 4.6 V at selected electrolytes. The dQ/dV curves of Li||NCM85 batteries (F) without and (G) with 2 wt% LiDFOB additive. Nyquist plots for batteries (H) after the first cycle and (I) after 300 cycles, respectively. The inset is the enlarged view of the high-frequency area in the red dotted box of (I). (J) Rate capability of Li||NCM85 batteries in the voltage range of 3.0-4.6 V. (K) Cyclic stability and coulombic efficiency of Li||NCM85 batteries at the charge/discharge rate of 2 C/5 C in the voltage range of 3.0-4.6 V.