Preparation method of gel thin film

Abstract

The invention discloses a preparation method of a gel thin film. The preparation method is simple and convenient to operate and feasible. According to the gel thin film prepared by the method, a polyolefin diaphragm is introduced, so that the mechanical property and the conductivity of a polyacrylonitrile gel electrolyte are improved; and when the gel thin film is used for preparing a lithium ionbattery, the battery has relatively high discharge specific capacity and charging and discharging efficiency.

Description

technical field [0001] The invention relates to the field of novel chemical materials, in particular to a method for preparing a gel film. Background technique [0002] Lithium-ion batteries using polymer solid electrolytes have been valued by researchers because of their safety, no leakage, small leakage current, and arbitrary shape. Due to the low conductivity of the polymer solid electrolyte at room temperature (10-5~10-4s / cm), the contact with the electrode is poor, and the mechanical strength is poor and the fracture toughness is low. [0003] The currently widely used lithium-ion battery electrolyte is a liquid electrolyte, which has the advantage of high conductivity, but because it contains flammable and volatile organic solvents, it releases flammable gases during charging and discharging, especially in some unconventional work. Under certain conditions (such as high-power charging and discharging, overcharging and overdischarging, etc.), the generation of a large ...

AI Technical Summary

Problems solved by technology

Due to the low conductivity of the polymer solid electrolyte at room temperature (10-5~10-4s / cm), the contact with the electrode is poor, and the mechanical strength is poor and the fracture toughness is low.

[0003] The currently widely used lithium-ion battery electrolyte is a liquid electrolyte, which has the advantage of high conductivity, but because it contains flammable and volatile organic solvents, it releases flammable gases during charging and discharging, especially in some unconventional work. Under certain conditions (such as high-power charging and discharging, overcharging and overdischarging, etc.), the generation of a large amount of heat will accelerate the generation of gas, resulting in an increase in the internal pressure of the battery, gas leakage, and even fire and explosion, so there are serious safety hazards