Dual-Halide Interphase Enabling High-Performance Lithium Metal Batteries in Wide-Temperature Range
Ao Sun, Haifeng Tu, Zhengguang Sun, Zhigang He, Yuchen Wang, Jian Wang, Yuting Zheng, Fengyi Zhu, Lu Wang, Farwa Mushtaq, Pan Xue, Jun Liu, Meinan Liu
Abstract
Robust lithium-ion diffusion kinetics enable superior battery performance even under harsher conditions, but the complex processes containing transport via liquid, interphase, and solid phases make it challenging. Herein, a dual halide-based electrode/electrolyte interphase (EEI) strategy is proposed to boost the Li + ion diffusion kinetics through rational design of electrolyte. This dual-halide EEI not only accelerates interfacial Li + diffusion but also protects electrodes from taking side reactions under high-voltage and harsh temperatures. Benefiting from these features, the Li/LiCoO 2 cells deliver an impressive performance at high-voltage window 4.5 V (209 mAh g –1, 95.2% capacity retention after 100 cycles) and wide temperatures (98.1% capacity retention at 60 °C after 100 cycles; 87.7% capacity retention at −20 °C after 20 cycles). These results well demonstrate the efficiency of this dual halide EEI, which empowers lithium metal batteries toward practical applications.