Preparation method of gel polymer electrolyte

Abstract

The invention relates to a preparation method of a gel polymer electrolyte. The method comprises the following steps: mixing an electrolyte solvent, a polymerizable solvent monomer and an electrolytelithium salt to obtain an electrolyte composition; and adding cationic ions containing Li<+>, Al<3+>, Ga<3+> and In<3+> and anionic combinations of PF6<->, BF4<->, Cl<->, Br<->, I<-> and CF3SO3<-> orinitiators of BF3 compounds into the electrolyte composition, and polymerizing to generate the gel polymer electrolyte. The preparation method has the following beneficial effects: the epoxy ether monomer is self-polymerized, and the electrolyte is wrapped in the epoxy ether polymer to obtain the gel polymer electrolyte, so that the obtained gel polymer electrolyte has certain viscosity and relatively high room-temperature ionic conductivity.

Description

technical field [0001] The invention relates to the technical field of new electrolyte materials for secondary batteries, in particular to a preparation method of a gel polymer electrolyte. Background technique [0002] With the technological development and demand for electric vehicles and rechargeable mobile devices, secondary batteries, as a representative of the new energy field, have also developed rapidly. Among these secondary batteries, lithium-ion batteries are light in weight and energy-efficient. Advantages such as high density have been commercially produced and widely used. Generally, a lithium secondary battery includes an anode and cathode active material that can intercalate and deintercalate lithium ions and an electrolyte as a lithium ion transport medium. Among them, the electrolyte is one of the important components of the high specific energy lithium secondary battery, which has a critical impact on the energy density, reaction kinetics, cycle life and ...

AI Technical Summary

Problems solved by technology

[0003] Gel and solid polymer electrolyte lithium-ion batteries can effectively solve the problem of electrolyte leakage during the use of liquid lithium-ion batteries, greatly reducing the burning and explosion of lithium-ion batteries under extreme conditions such as overcharge and discharge, puncture and impact. The possibility of safety issues, but compared with traditional liquid electrolytes, most of the all-solid electrolytes have low room temperature ionic conductivity, about 10 -7 S cm -1 , and has a high dependence on temperature, all-solid-state batteries generally need to work normally at a relatively high temperature (60-80°C), which is far from meeting the needs of practical applications

Images