Preprint Article Version 2 This version is not peer-reviewed

Core-Shell Nanofiber Containing Large Amount of Flame Retardants via Coaxial Dual-Nozzle Electrospinning as Battery Separators

Version 1 : Received: 16 July 2019 / Approved: 17 July 2019 / Online: 17 July 2019 (10:18:44 CEST)
Version 2 : Received: 15 September 2019 / Approved: 17 September 2019 / Online: 17 September 2019 (12:19:49 CEST)

How to cite: Zhao, Y.; Chen, Y.; Kang, Y.; Wang, L.; Yang, S.; Liang, Z.; Li, Y. Core-Shell Nanofiber Containing Large Amount of Flame Retardants via Coaxial Dual-Nozzle Electrospinning as Battery Separators. Preprints 2019, 2019070201 (doi: 10.20944/preprints201907.0201.v2). Zhao, Y.; Chen, Y.; Kang, Y.; Wang, L.; Yang, S.; Liang, Z.; Li, Y. Core-Shell Nanofiber Containing Large Amount of Flame Retardants via Coaxial Dual-Nozzle Electrospinning as Battery Separators. Preprints 2019, 2019070201 (doi: 10.20944/preprints201907.0201.v2).

Abstract

Lithium-ion batteries have attracted enormous interests recently as promising power sources. However, the safety issue associated with the employment of highly flammable liquid electrolyte impedes the further development of next-generation lithium-ion batteries. Recently, researchers reported the use of electrospun core-shell fiber as the battery separator consisting of polymer layer as protective shell and flame retardants loaded inside as core. In case of a typical battery shorting, the protective polymer shell melts during thermal-runaway and the flame retardants inside would be released to suppress the combustion of the electrolyte. Due to the use of a single precursor solution for electrospinning containing both polymer and flame retardants, the weight ratio of flame retardants is limited and dependent. Herein, we developed a dual-nozzle, coaxial electrospinning approach to fabricate the core-shell nanofiber with a greatly enhanced flame retardants weight percentage in the final fibers. The weight ratio of flame retardants of triphenyl phosphate in the final composite reaches over 60 wt.%. The LiFePO4-based cell using this composite nanofiber as battery separator exhibits excellent flame-retardant property without compromising the cycling stability or rate performances. In addition, this functional nanofiber can also be coated onto commercial separators instead of being used directly as separators.

Subject Areas

lithium ion battery; safety; flame retardant; separator; electrospun fibers; dual-nozzle coaxial electrospinning

Comments (1)

Comment 1
Received: 17 September 2019
Commenter: Zheng Liang
Commenter's Conflict of Interests: Author
Comment: -
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