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Influence of PAN/PANI polymer on low-temperature rate performance of LiFePO4

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Abstract

In order to improve the charge transfer rate and Li+ diffusion coefficient of LiFePO4 (LFP), the material was surface treated with polyacrylonitrile/polyaniline (PAN/PANI). PAN/PANI polymers were synthesized by a self-assembly process, and LFP@PAN/PANI were prepared by a wet-coating process. LFP@PAN/PANI exhibits superior electrochemical performance compared to bare LFP, with a discharge capacity of 3088.97 mAh at low temperature and high rate condition (−20 °C, 26650-type cylindrical battery, 5 C rate), and a relatively high low-temperature discharge plateau (2.68 V). Electrochemical impedance spectroscopy (EIS) proves that the Li+ diffusion coefficient of LFP@PAN/PANI is an order of magnitude higher than that of bare LFP. The above performance is improved because the polar cyano group of the polymer can interact with the electrolyte and Li+, and the polyaniline makes the polymer have high conductivity. Therefore, the composite of the two polymers endows LFP with excellent Li+ activity and high conductivity.

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Acknowledgements

The authors are grateful to the National Ministry of Science and Technology major special projects (Grant number: SQ2020YFF0400789) for the financial support to this work.

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Authors and Affiliations

  1. Institute of Power Source and Ecomaterials Science, Hebei University of Technology, Tianjin, 300130, China

    Ruoxuan Liu, Hongyuan Guo, Haoyan Gu, Weida Li, Xin Ren & Guangchuan Liang

  2. Tianjin EV Energies Co., LTD, Tianjin, 300380, China

    Jingrui Cao

  3. Sichuan Development Lomon Co., LTD, Chengdu, 610094, China

    Quanjun Fu

  4. Key Laboratory of Special Functional Materials for Ecological Environment and Information (Hebei University of Technology), Ministry of Education, Tianjin, 300130, China

    Guangchuan Liang

  5. Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin, 300130, China

    Guangchuan Liang

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  1. Ruoxuan Liu
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Correspondence to Guangchuan Liang.

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Liu, R., Guo, H., Gu, H. et al. Influence of PAN/PANI polymer on low-temperature rate performance of LiFePO4. Ionics 29, 2175–2189 (2023). https://doi.org/10.1007/s11581-023-04983-3

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