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Flexible, high-wettability and thermostable separator based on fluorinated polyimide for lithium-ion battery

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Abstract

To meet the booming demands for lithium-ion battery (LIB), it is practically significant to promote its electrochemical performance and safety. In our work, a novel kind of flexible membrane as separator for LIB is prepared via phase inversion method with soluble polyimide (SPI) containing trifluoromethyl substituent, which is synthesized from 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB) and 4,4′-oxydiphthalic anhydride (ODPA). The SPI separator shows 5% weight loss temperature (Td5%) of 535 °C and maintains intrinsic dimension even after heating at 200 °C. The SPI membrane depicts a sponge-like structure with abundant interconnected pores and delivers a dominant porosity (67%). The SPI membrane displays desired electrolyte wettability, validated by contact angle tests (16.2° and 46.8° for SPI membrane and PE separator, respectively) and electrolyte uptake tests (420 and 132% for SPI membrane and PE separator, respectively). The LIB with SPI membrane as separator exhibits nice ionic conductivity (0.92 mS cm−1) than that with PE separator (0.30 mS cm−1), and therefore affords better electrochemical performance, such as cycling stability and rate capability.

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Funding

This work was financially supported by the National Natural Science Foundation of China (51003033) and the Fundamental Research Funds for the Central Universities, SCUT (Grant Number 2015ZM100).

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  1. School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510641, People’s Republic of China

    Jinyan Tan, Lingyi Kong, Zhiming Qiu & Yurong Yan

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  1. Jinyan Tan
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  2. Lingyi Kong
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  3. Zhiming Qiu
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Correspondence to Zhiming Qiu or Yurong Yan.

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Tan, J., Kong, L., Qiu, Z. et al. Flexible, high-wettability and thermostable separator based on fluorinated polyimide for lithium-ion battery. J Solid State Electrochem 22, 3363–3373 (2018). https://doi.org/10.1007/s10008-018-4049-1

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