A flame-retardant composite solid-state electrolyte based on electrospinning and in-situ polymerization, and a preparation method and application thereof

Abstract

The application discloses a kind of flame-retardant composite solid electrolyte based on electrospinning and in-situ polymerization and its preparation method and application.The preparation process of the electrolyte is as follows: after dispersing flame-retardant material in solvent, add polymer containing polymerizable double bond, then electrospinning and dry to obtain nanofiber membrane; uniformly mix precursor raw materials including lithium salt, photopolymerization monomer and photoinitiator, then fully immerse nanofiber membrane, in-situ polymerize and dry under ultraviolet light, and it is obtained.The electrolyte is based on the synergistic effect of flame-retardant three-dimensional skeleton obtained by electrospinning and in-situ polymerization under ultraviolet light, which greatly improves the high-temperature stability and cycle stability of the electrolyte while ensuring its excellent mechanical properties; the lithium ion battery obtained by using the electrolyte has excellent rate performance and extremely low battery impedance, and the test shows that the first circle battery impedance value of the battery is 37.9 Ω at room temperature, and the discharge capacity retention rate can reach 61% under 5C rate.

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