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Lithium-ion batteries have attracted enormous interests recently as promisingpower sources. However, the safety issue associated with the employment ofhighly flammable liquid electrolyte impedes the further development ofnext-generation lithium-ion batteries. Recently, researchers reported the useof electrospun core-shell fiber as the battery separator consisting of polymerlayer as protective shell and flame retardants loaded inside as core. In caseof a typical battery shorting, the protective polymer shell melts duringthermal-runaway and the flame retardants inside would be released to suppressthe combustion of the electrolyte. Due to the use of a single precursorsolution for electrospinning containing both polymer and flame retardants, theweight ratio of flame retardants is limited and dependent. Herein, we developeda dual-nozzle, coaxial electrospinning approach to fabricate the core-shellnanofiber with a greatly enhanced flame retardants weight percentage in thefinal fibers. The weight ratio of flame retardants of triphenyl phosphate inthe final composite reaches over 60 wt.%. The LiFePO4-based cell using thiscomposite nanofiber as battery separator exhibits excellent flame-retardantproperty without compromising the cycling stability or rate performances. Inaddition, this functional nanofiber can also be coated onto commercialseparators instead of being used directly as separators.

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