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Investigation on PVDF-HFP microporous membranes prepared by TIPS process and their application as polymer electrolytes for lithium ion batteries

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Abstract

Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) microporous membranes were prepared via thermally induced phase separation (TIPS) process. Then they were immersed in a liquid electrolyte to form polymer electrolytes. The effects of polymer content in casting solution on the morphology, crystallinity, and porosity of the membranes were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and a mercury porosimeter, respectively. Ionic conductivity, lithium-ion transference number, and electrochemical stability window of corresponding polymer electrolytes were characterized by AC impedance spectroscopy, DC polarization/AC impedance combination method, and linear sweep voltammetry, respectively. The results showed that spherulites and “net-shaped” structure coexisted for the membranes. Polymer content had no effect on crystal structure of the membranes. The maximum transference number was 0.55. The temperature dependence of ionic conductivity followed the Vogel–Tammann–Fulcher (VTF) relation. The maximum ionic conductivity was 2.93 × 10−3 Scm−1 at 20 °C. Electrochemical stability window was stable up to 4.7 V (vs. Li+/Li).

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Acknowledgements

This work is supported by the National Nature Foundation of China (No. 50433010).

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Zhen-Yu Cui, You-Yi Xu, Li-Ping Zhu, Jian-Yu Wang & Bao-Ku Zhu

  2. College of Science, Liaoning Technical University, Fuxin, 123000, People’s Republic of China

    Zhen-Yu Cui

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  1. Zhen-Yu Cui
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  2. You-Yi Xu
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  3. Li-Ping Zhu
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  4. Jian-Yu Wang
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  5. Bao-Ku Zhu
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Correspondence to You-Yi Xu.

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Cui, ZY., Xu, YY., Zhu, LP. et al. Investigation on PVDF-HFP microporous membranes prepared by TIPS process and their application as polymer electrolytes for lithium ion batteries. Ionics 15, 469–476 (2009). https://doi.org/10.1007/s11581-008-0253-9

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  • DOI: https://doi.org/10.1007/s11581-008-0253-9

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