Abstract
Poly(ethylene glycol) diacrylate (PEGDA)-based gel polymer electrolytes (GPEs) offer several advantages for high-voltage lithium metal batteries (LMBs). However, the limited Li+ transport capability hinders the wide application of PEGDA. A cross-linked GPE consisting of PEGDA and acrylonitrile (AN) (designated as PA11 electrolyte) is synthesized through molecular design to investigate the impact of AN incorporation on the PEGDA-based GPE. AN exhibits good compatibility with PEGDA, and the resulting cross-linked copolymer effectively reduces the crystallinity of GPE, thereby enhancing its Li+ transport capability. At 25°C, the PA11 electrolyte exhibits high ionic conductivity (2.04 × 10−4 S cm−1), broad electrochemical window (− 0.5 V to 5.32 V versus Li+/Li), and good stability towards lithium metal showing stable deposition and stripping of lithium for 1000 h. Additionally, LFP||Li cells assembled with designed PA11 electrolyte demonstrate discharge capacities of 150.4 mA h g−1 at 0.05 C and 122.9 mA h g−1 at 0.5 C. Moreover, the PA11 electrolyte can be applied in LMFP-based high-voltage LMBs with a capacity retention ratio of 84.9% after 20 cycles.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Grant No. 52102315) and the Zhejiang Provincial Natural Science Foundation of China (Grant No. LY21E020010, No. LQ23E020009).
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Yuan, J., Ren, G., Yang, Y. et al. A Cross-Linked Gel Polymer Electrolyte Composed of PEGDA and Acrylonitrile for High-Voltage Lithium Metal Batteries. J. Electron. Mater. (2024). https://doi.org/10.1007/s11664-024-11096-8
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DOI: https://doi.org/10.1007/s11664-024-11096-8