Preparation method of radiation crosslinking polymer gel electrolyte skeleton material

Abstract

The invention relates to a preparation method of gel polymer electrolyte skeleton material by using radiation crosslinking and electrospinning technology and belongs to the field of polymer lithium ion battery. The skeleton material can be prepared into gel polymer electrolyte with good electrochemical properties and mechanical properties. The preparation steps are as below: (1) preparation of a blending-type polymer nano fiber membrane by using electrostatic spinning technology; (2) radiation crosslinking of polymer nano fiber membrane; and (3) cutting of crosslinking nano fiber membrane and lamination compression into the polymer gel electrolyte skeleton. The electrolyte skeleton material takes into account the equalization demand of mechanics-electrochemistry performances of gel polymer electrolyte, and has strong adsorption and retention on electrolyte; the prepared gel polymer electrolyte has high ionic conductivity, stable electrochemical window and good charge discharge performance, and the excellent mechanical properties can meet the assembly needs of the commonly used button battery; and the invention can be used in preparation of secondary lithium ion battery.

Description

[0001] technical field [0002] The invention relates to a method for preparing a gel-type polymer electrolyte framework material by applying radiation crosslinking and electrospinning technologies, belonging to the field of polymer lithium ion batteries. Background technique [0003] Lithium-ion batteries have the advantages of high energy density, high output voltage, long cycle life, low self-discharge rate, easy processing and strong designability, etc., and have broad application prospects in the fields of electric vehicles, portable electronic devices and mobile communications. The development and application of liquid lithium-ion batteries are limited due to the safety issue of "leakage" and the release of toxic and flammable gases. Although all-solid-state lithium-ion batteries have good safety performance, their room temperature ionic conductivity is low, which cannot meet practical application needs. Since the gel polymer electrolyte combines the advantages of bot...

AI Technical Summary

Problems solved by technology

In the Chinese patent ZL 01113005.9, acrylate series derivatives are used as monomers, and chemical crosslinking is initiated by an initiator under heating conditions to obtain a gel-state electrolyte material of an acrylate polymer. However, this method requires the addition of an initiator or Cross-linking agent, the residual initiator or cross-linking agent after the reaction will affect the performance of the gel polymer electrolyte

Japanese patent JPA 5-109310 discloses the application of ultraviolet light to irradiate the mixture of photosensitive crosslinking monomer and electrolyte to obtain a crosslinked gel electrolyte, but its mechanical strength after irradiation is not good

The addition of reinforcing particles will also affect the electrochemical performance of the polymer electrolyte.