Constructing Highly Li Conductive Electrode Electrolyte Interphases for 4.6 V Li||LiCoO Batteries via Electrolyte Additive Engineering.

To improve voltage is considered to effectively address the energy-density question of Li||LiCoO batteries. However, it is restricted by the instability of electrode electrolyte interphases in carbonate electrolytes, which mainly originates from Li dendrite growth and structural instability of LiCoO at high voltage. Herein, an electrolyte additive strategy is proposed for constructing efficient LiN O -contained cathode electrolyte interphase for 4.6 V LiCoO and LiF-rich solid electrolyte interphase for Li anode to enhance the stability of Li||LiCoO battery using 4-nitrophthalic anhydride as the additive. As expected, the Li||LiCoO battery can stably operate up to 4.6 V, with a high specific capacity of 216.9 mAh g during the 1st cycle and a capacity retention of 167.1 mAh g after 200 cycles at 0.3 C. This work provides an available strategy to realize the application of high-voltage Li||LiCoO battery.