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Electrospun PVDF-HFP/PAN bicomponent nanofibers as separators in lithium-ion batteries with high thermal stability and electrolyte wettability

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Abstract

Battery reliability is emerging as a new challenge due to the thermal stability and electrolyte wettability of polyolefin separators used in lithium-ion batteries. In this study, a method to improve the thermal stability and electrolyte wettability of a polyolefin separator is proposed. Bicomponent nanofibers were successfully fabricated by electro-spinning poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) with high ionic conductivity and polyacrylonitrile (PAN) with excellent thermal stability. The nanofiber-based separator of PVDF-HFP/PAN exhibited high porosity (60–76%), electrolyte uptake (≅2,000%), and thermal stability (5%<shrinkage, at 200 °C) than conventional polyolefin separator. The battery using the bicomponent nanofiber separator composed of PVDF-HFP and PAN showed better cycle performance (421 mAh/g, after 80 cycle), efficiency (≅99.6%), and c-rate performance (418 mAh/g, 3C) than the battery using polyolefin separator.

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Acknowledgements

This work was supported by the Graduate School of Post Plastic specialization of Korea Environmental Industry & Technology Institute grant funded by Ministry of Environment, Republic of Korea.

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Authors and Affiliations

  1. Department of Chemical Engineering, Hanyang University, Seoul, 04763, Korea

    Jaeseon Lee, Jinsoo Yoon & Seong-Geun Oh

  2. Carbon Neutral Technology R&D Department, Korea Institute of Industrial Technology, Cheonan, Chungnam, 31056, Korea

    Jaeseon Lee & Hoon Huh

  3. Department of Materials Science and Engineering, Inha University, Incheon, 22212, Korea

    Jaesung Jeon

  4. Grapsil, Korea Institute of Industrial Technology, Cheonan, Chungnam, 31056, Korea

    Yohan Hong

Authors
  1. Jaeseon Lee
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  2. Jinsoo Yoon
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  3. Jaesung Jeon
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  4. Yohan Hong
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  5. Seong-Geun Oh
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  6. Hoon Huh
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Correspondence to Seong-Geun Oh or Hoon Huh.

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Lee, J., Yoon, J., Jeon, J. et al. Electrospun PVDF-HFP/PAN bicomponent nanofibers as separators in lithium-ion batteries with high thermal stability and electrolyte wettability. Korean J. Chem. Eng. 40, 1901–1911 (2023). https://doi.org/10.1007/s11814-023-1486-z

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  • DOI: https://doi.org/10.1007/s11814-023-1486-z

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