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Article

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

by 1,*, 2,* and 1,*
1
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA
2
Institute of Nuclear & New Energy Technology, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(17), 3391; https://doi.org/10.3390/en12173391
Received: 25 July 2019 / Revised: 30 August 2019 / Accepted: 30 August 2019 / Published: 3 September 2019
(This article belongs to the Special Issue Advanced Nanomaterials for Li- and Na-Ion Batteries)
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 LiNi1/3Co1/3Mn1/3O2 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. View Full-Text
Keywords: lithium-ion battery; safety; separator; coaxial electrospinning; dual-nozzle; core-shell nanofiber lithium-ion battery; safety; separator; coaxial electrospinning; dual-nozzle; core-shell nanofiber
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MDPI and ACS Style

Liang, Z.; Zhao, Y.; Li, Y. Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety. Energies 2019, 12, 3391. https://doi.org/10.3390/en12173391

AMA Style

Liang Z, Zhao Y, Li Y. Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety. Energies. 2019; 12(17):3391. https://doi.org/10.3390/en12173391

Chicago/Turabian Style

Liang, Zheng; Zhao, Yun; Li, Yanxi. 2019. "Electrospun Core-Shell Nanofiber as Separator for Lithium-Ion Batteries with High Performance and Improved Safety" Energies 12, no. 17: 3391. https://doi.org/10.3390/en12173391

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