Self-degradation functional unit introduction for anti-oxidation ability enhancement of Poly(vinyl ethylene carbonate) electrolyte
【Abstract】
Poly(vinyl ethylene carbonate) (PVEC) electrolyte is a promising option for high-performance solid-state lithium metal batteries (SSLMBs). However, the anti-oxidation ability is still too low to match the high-voltage cathode materials. Herein, a novel copolymer electrolyte of poly(vinyl ethylene carbonate- 3-Sulfolene) (P(VEC-SF)-PE) has been developed by copolymerizing 3-Sulfolene (SF) and vinyl ethylene carbonate (VEC) monomer precursors. The P(VEC-SF)-PE possess a wide electrochemical stability window of 5 V (vs. Li+/Li), high lithium ion transference number of 0.6 and ionic conductivity of 7.97×10-4 S cm-1 at 25°C. The anti-oxidation ability is enhanced by the pre-degradation of sulfolene-based functional units and confirmed by the multiple techniques. The P(VEC-SF)-PE based SSLMBs with LiCoO2 cathode exhibit a high discharge capacity and good rates performances when charged to 4.5 V. This study presents an efficient strategy to improve the compatibility of cathode/electrolyte interface and the electrochemical performances of high-energy SSLMBs.
【Author】
Zhiyuan Lin, Fang Chen, Xin Yin, Peipei Ding, Yonggao Xia, Xianwei Guo, Haijun Yu
【Journal】
Journal of Materials Chemistry A(IF：10.7) Time：2024-04-26
