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Enhanced thermal stability and wettability of an electrospun fluorinated poly(aryl ether ketone) fibrous separator for lithium-ion batteries

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Abstract

To improve the safety and high performance of lithium-ion batteries (LIBs), a novel and heat-resistant fluorinated poly(aryl ether ketone) (FPAEK) compound was successfully synthesized and further fabricated as a nonwoven fibrous separator for LIBs via an electrospinning method. The morphology, thermal properties and electrochemical performances of the as-prepared electrospun FPAEK separators were characterized. The separator had no dimensional shrinkage at 150 °C for 1 h and no disintegration until reaching 500 °C. The electrospun FPAEK porous separators possessed much higher ionic conductivity (3.15 mS cm−1) than that of a commercial polypropylene (PP) separator (0.66 mS cm−1) due to their higher porosity and electrolyte uptake. The LIBs assembled with the electrospun fibrous separators exhibited higher discharge capacity (148.9 mA h g−1) and longer cycle life (with 94.3% capacity retention after 250 cycles) than those assembled with the PP separator, with values of 139.5 mA h g−1 and 88.9%, respectively. The measurements demonstrated that electrospun FPAEK separators may be promising candidates for high-performance LIBs.

Graphical abstract: Enhanced thermal stability and wettability of an electrospun fluorinated poly(aryl ether ketone) fibrous separator for lithium-ion batteries

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Article information


Submitted
12 Nov 2019
Accepted
24 Jan 2020
First published
31 Jan 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Enhanced thermal stability and wettability of an electrospun fluorinated poly(aryl ether ketone) fibrous separator for lithium-ion batteries

H. Li, F. Lin, H. Wang, H. Wu, Y. Yang, L. Yu, W. Liu and D. Luo, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ05656D

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