Study on preparation of polyacrylonitrile/polyimide composite lithium-ion battery separator by electrospinning

Abstract

Compared with commercial polyolefin membranes, polyacrylonitrile (PAN) membrane prepared by electrostatic spinning has higher porosity, electrolyte uptake, thermal stability, and lithium-ion conductivity, etc. However, poor mechanical performance has largely limited the application of electrospun PAN separators. In this study, PAN/polyimide (PI) composite membrane is prepared by electrostatic spinning to improve the mechanical and electrochemical performances. Scanning electron microscopy, thermal analysis method, and electrochemical methods were used for evaluation of the electrospun composite membrane. The results show that the composite membrane possesses good thermal stability and exhibits better mechanical performance than pristine PAN membrane (increasing by 1.1 times in tension strength). The addition of PI can increase porosity and fluid absorption rate obviously. In addition, the composite membrane has high ionic conductivity (18.77 × 10−4 S/cm), wide electrochemical window (about 4.0 V), and excellent cycling performance. It can retain a discharge specific capacity of 153 mA h/g even after 50 cycles at 0.5 C. The electrospun PAN/PI membrane may be a promising candidate for lithium-ion battery separators.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51572177) and the National Natural Science Foundation of China (51072125). All authors read and commented on the manuscript.

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Correspondence to Jian Chen.

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Li, L., Liu, P., Fu, Q.S. et al. Study on preparation of polyacrylonitrile/polyimide composite lithium-ion battery separator by electrospinning. Journal of Materials Research 34, 642–651 (2019). https://doi.org/10.1557/jmr.2019.8

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