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Effect of drying temperature on a thin PVDF-HFP/PET composite nonwoven separator for lithium-ion batteries

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Abstract

A thin composite separator with polyethylene terephthalate nonwoven membrane as the structural support and polyvinylidene fluoride-hexafluoropropylene as the coating layer for lithium-ion batteries was prepared by a simple dip-coating process. The effect of different drying temperatures on the performance of the composite separator was investigated. The results indicate that 80 °C is the optimal drying temperature, preventing leakage current problems and providing a well-developed porous structure. The drying of the composite separator at 80 °C provides a superior thermal stability, better wettability with electrolyte, higher electrolyte uptake, and ionic conductivity compared to commercially available polypropylene (PP) separator. Furthermore, the electrochemical performance consisting of electrochemical stability, self-discharge, cycle performance, rate performance of the composite separator, and PP were determined. The drying of the composite separator at 80 °C shows almost the same oxidation stability and self-discharge performance, but a better cycling and rate performance than the PP separator.

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Acknowledgements

The authors gratefully acknowledge financial support from the key basic research programs of science and technology commission of Shanghai municipality (No. 12JC1410000) and the National Natural Science Foundation of China (Grant No. 21303245).

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Authors and Affiliations

  1. Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China

    Weibiao Li & Anbao Yuan

  2. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 201800, China

    Weibiao Li, Xiaozhe Li, Xiaohua Xie & Baojia Xia

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  1. Weibiao Li
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  2. Xiaozhe Li
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  3. Xiaohua Xie
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  4. Anbao Yuan
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  5. Baojia Xia
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Correspondence to Xiaohua Xie or Anbao Yuan.

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Li, W., Li, X., Xie, X. et al. Effect of drying temperature on a thin PVDF-HFP/PET composite nonwoven separator for lithium-ion batteries. Ionics 23, 929–935 (2017). https://doi.org/10.1007/s11581-016-1891-y

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  • DOI: https://doi.org/10.1007/s11581-016-1891-y

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