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Cross-linked Electrospun Gel Polymer Electrolytes for Lithium-Ion Batteries

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Abstract

Lithium-ion batteries (LIBs) benefit from an effective electrolyte system design in both terms of their safety and energy storage capability. Herein, a series of precursor membranes with high porosity were produced using electrospinning technology by mixing PVDF and triblock copolymer (PS-PEO-PS), resulting in a porous structure with good interconnections, which facilitates the absorbency of a large amount of electrolyte and further increases the ionic conductivity of gel polymer electrolytes (GPEs). It has been demonstrated that post-cross-linking of the precursor membranes increases the rigidity of the nanofibers, which allows the polymer film to be dimensionally stable up to 260 °C while maintaining superior electrochemical properties. The obtained cross-linked GPEs (CGPEs) showed high ionic conductivity up to 4.53×10−3 S·cm−1. With the CGPE-25, the assembled Li/LiFePO4 half cells exhibited good rate capability and maintained a capacity of 99.4% and a coulombic efficiency of 99.3% at 0.1 C. These results suggest that the combination of electrospinning technique and post-cross-linking is an effective method to construct polymer electrolytes with high thermal stability and steadily decent electrochemical performance, particularly useful for Lithium-ion battery applications that require high-temperature usage.

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Data Availability Statement

The related data (DOI: https://doi.org/10.57760/sciencedb.j00189.00003) for this paper is available in the Data Repository of China Association for Science and Technology (https://www.scidb.cn/c/cjps).

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 21574087 and 51973128) and Science and Technology Department of Sichuan Province (Nos. 2019YJ0128 and 2019YFG0277). LL thanks the supports from the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China

    Xue Gong, Qin Xiao, Qing-Yin Li, Wen-Cui Liang, Feng Chen, Long-Yu Li & Shi-Jie Ren

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  1. Xue Gong
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  2. Qin Xiao
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  3. Qing-Yin Li
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  4. Wen-Cui Liang
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Correspondence to Long-Yu Li or Shi-Jie Ren.

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Gong, X., Xiao, Q., Li, QY. et al. Cross-linked Electrospun Gel Polymer Electrolytes for Lithium-Ion Batteries. Chin J Polym Sci (2024). https://doi.org/10.1007/s10118-024-3136-2

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