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Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety

Author

Listed:
  • Zheng Liang

    (Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA)

  • Yun Zhao

    (Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China)

  • Yanxi Li

    (Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA)

Abstract

Though the energy density of lithium-ion batteries continues to increase, safety issues related to the internal short circuit and the resulting combustion of highly flammable electrolytes impede the further development of lithium-ion batteries. It has been well-accepted that a thermal stable separator is important to postpone the entire battery short circuit and thermal runaway. Traditional methods to improve the thermal stability of separators include surface modification and/or developing alternate material systems for separators, which may affect the battery performance negatively. Herein, a thermostable and shrink-free separator with little compromise in battery performance was prepared by coaxial electrospinning and tested. The separator consisted of core-shell fiber networks where poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) layer served as shell and polyacrylonitrile (PAN) as the core. This core-shell fiber network exhibited little or even no shrinking/melting at elevated temperature over 250 °C. Meanwhile, it showed excellent electrolyte wettability and could take large amounts of liquid electrolyte, three times more than that of conventional Celgard 2400 separator. In addition, the half-cell using LiNi 1/3 Co 1/3 Mn 1/3 O 2 as cathode and the aforementioned electrospun core-shell fiber network as separator demonstrated superior electrochemical behavior, stably cycling for 200 cycles at 1 C with a reversible capacity of 130 mA·h·g −1 and little capacity decay.

Suggested Citation

  • Zheng Liang & Yun Zhao & Yanxi Li, 2019. "Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety," Energies, MDPI, vol. 12(17), pages 1-10, September.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3391-:d:263553
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    References listed on IDEAS

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    1. J.-M. Tarascon & M. Armand, 2001. "Issues and challenges facing rechargeable lithium batteries," Nature, Nature, vol. 414(6861), pages 359-367, November.
    2. Yu Miao & Patrick Hynan & Annette von Jouanne & Alexandre Yokochi, 2019. "Current Li-Ion Battery Technologies in Electric Vehicles and Opportunities for Advancements," Energies, MDPI, vol. 12(6), pages 1-20, March.
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    Cited by:

    1. Krzysztof Siczek, 2022. "Life-Related Hazards of Materials Applied to Mg–S Batteries," Energies, MDPI, vol. 15(4), pages 1-44, February.

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