Abstract
In this study, zwitterionic poly(ionic liquid)-based polymer electrolytes with a network structure are prepared by ultraviolet-irradiation radical polymerization of poly(ethylene glycol) methyl ether acrylate (PEGMEA) and zwitterionic liquids, and poly(ethylene glycol) diacrylate is used as cross-linker. The cross-linked structure endows the electrolytes with high thermal stability and excellent dimensional stability. The abundant ether-oxygen group of PEGMEA provides sufficient sites for the transport of Li+ and a high ionic conductivity of 0.20 × 10−3 S cm−1. The electrolyte shows a high lithium-ion transference number of 0.78, owing to the excellent dissociation ability of zwitterionic liquids towards lithium salts. The lithium symmetric battery can maintain a voltage polarization of 150 mV at 0.1 mA cm−2 over 600 h. The Li/LiFePO4 battery shows a discharge capacity of 122 mAh g−1, a capacity retention of 90.0% after 100 cycles, and an average Coulombic efficiency exceeding 99% at 0.1 C, demonstrating strong application potential in lithium-ion batteries.
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This work was supported by National Natural Science Foundation of China (No.51973022), Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX223037), and Qing Lan project of Jiangsu province.
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Liu, J., Xu, Y., Xu, F. et al. Zwitterionic poly(ionic liquids)-based polymer electrolytes for Lithium-ion batteries applications. Ionics 29, 2249–2259 (2023). https://doi.org/10.1007/s11581-023-04978-0
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DOI: https://doi.org/10.1007/s11581-023-04978-0