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Electrospun Fluorinated Polyimide/Polyvinylidene Fluoride Composite Membranes with High Thermal Stability for Lithium Ion Battery Separator

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Abstract

The separator with excellent mechanical and thermal properties are highly required for lithium ion batteries (LIBs). Therefore, it is crucial to develop novel nanofibrous membranes with enhanced mechanical strength and thermal stability. In this work, the fluorinated polyimide (FPI) was synthesized and blended with polyvinylidene fluoride (PVDF) to fabricate composite nanofibrous membranes (CNMs) via electrospinning method. Benefiting from the introduction of aromatic FPI, the prepared PVDF/FPI nanofibrous membranes were endowed with enhanced mechanical strength and thermal stability. When the FPI content increased from 0 to 30 wt%, the tensile strength of composite nanofibrous membranes enhanced from 1.57 to 2.30 MPa. Moreover, there are almost no dimensional shrinkage for the CNM-30 containing 30 wt% FPI after heat treatment at 160 °C for 1 h. Furthermore, the prepared CNMs show improved electrochemical performances in comparison with neat PVDF and commercial Celgard membranes. The electrolyte uptake and ionic conductivity of the CNMs could reach to 522.4% and 1.14 ms·cm−1, respectively. The prepared CNMs could provide an innovative and promising approach for the development and design of high-performance separators.

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Acknowledgements

The authors gratefully acknowledge the supports from the Emergency Support and Public Safety Scientific Research Projects of National Advanced Functional Fiber Innovation Center (2020-fx020009), The Postgraduate Innovation Foundation of Xi’an Polytechnic University (CHX2020037) and Natural Science Foundation of Education Department of Shaanxi Province (21JK0657).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Xi’an Polytechnic University, Xi’an, 710048, China

    Jianwei Li, Xuanning Zhang, Yuyan Lu, Keliang Linghu, Chen Wang & Xinhai He

  2. Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemical and Chemical Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Zhonglei Ma

  3. National Advanced Functional Fiber Innovation Center, Suzhou, 215000, China

    Jianwei Li

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  1. Jianwei Li
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  2. Xuanning Zhang
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  3. Yuyan Lu
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  4. Keliang Linghu
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  5. Chen Wang
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  6. Zhonglei Ma
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  7. Xinhai He
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Correspondence to Jianwei Li or Xinhai He.

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Li, J., Zhang, X., Lu, Y. et al. Electrospun Fluorinated Polyimide/Polyvinylidene Fluoride Composite Membranes with High Thermal Stability for Lithium Ion Battery Separator. Adv. Fiber Mater. 4, 108–118 (2022). https://doi.org/10.1007/s42765-021-00093-9

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  • DOI: https://doi.org/10.1007/s42765-021-00093-9

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