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Solid polymer electrolytes based on poly(ionic liquid-co-ethylene oxide) for room-temperature solid-state lithium batteries

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Abstract

Solid polymer electrolytes (SPEs) possessing attractive electrochemical performance are essentially required for lithium-ion batteries (LIBs). Herein, a poly(imidazolium ionic liquid-co-ethylene oxide) (PILEO) is synthesized via a facile one-pot poly-Radziszewski reaction. The incorporated PILEO can reduce the crystallinity of the obtained SPEs, and hence facilitates lithium ion migration. It is demonstrated that the developed PILEO-60 SPE, without adding any plasticizers or inorganic fillers, exhibits a high ionic conductivity of 1.78 × 10−4 S cm−1 at 25 ℃ and a wide electrochemical stability window of 4.9 V (vs. Li/Li+). The assembled LFP/PILEO-60/Li cell possesses a high discharge capacity (140 mAh g−1 at 25 ℃), good cycling performance (90.3% of capacity retention after 100 cycles), and stable coulombic efficiency (99.7%). In combination with the industrially feasible synthetic procedure of PILEO, this work provides a facile and effective strategy for the fabrication of high-performance LIBs.

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Acknowledgements

The authors acknowledge the financial support from the Natural Science Foundation of Zhejiang Province (LY13B040004).

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Natural Science Foundation of Zhejiang Province, LY13B040004.

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  1. Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, China

    Kaichuang Cheng, Yijun Chen, Can Hao, Qinghua Tian & Wei Zhang

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Cheng, K., Chen, Y., Hao, C. et al. Solid polymer electrolytes based on poly(ionic liquid-co-ethylene oxide) for room-temperature solid-state lithium batteries. J Solid State Electrochem 28, 565–576 (2024). https://doi.org/10.1007/s10008-023-05707-3

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