Formula of gel electrolyte and method for preparing gel electrolyte using the formula

Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a formulation of a gel electrolyte for lithium-ion batteries, comprising the following components: 100 parts by weight of liquid electrolyte; 1-20 parts by weight of a compound with polyisocyanate; 0.1-10 parts by weight of compound of polyamino group or polyhydroxy group; 0.01-0.1 part by weight of crosslinking agent; 0.001-0.01 part by weight of catalyst; 0.001-0.01 part by weight of end-capping agent. Compared with the prior art, polycondensation reaction occurs between the monomers of the present invention to obtain a polymer gel skeleton, and the free liquid electrolyte is fixed in it, which improves the safety performance of the lithium-ion battery using the gel electrolyte formula . Moreover, there is no free radical initiator in the whole formula, which can effectively improve the electrochemical performance of the lithium ion battery adopting the gel electrolyte formula. In addition, the invention also discloses a method for preparing gel electrolyte by using the formula.

Description

technical field

[0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a formulation of a gel electrolyte for lithium-ion batteries and a method for preparing the gel electrolyte using the formulation. Background technique

[0002] Due to the advantages of high voltage, small size, light weight, high energy density, no memory effect, good environmental protection and long cycle life, lithium-ion batteries are gradually replacing traditional batteries such as lead-acid and Ni-Cd, and have gained market dominance. status. The electrolyte used in lithium-ion batteries is generally divided into two types: liquid electrolyte and polymer gel electrolyte (referred to as "gel electrolyte"). Among them, the liquid electrolyte has good electrochemical performance, but generally has the problem of poor safety. The main ways to solve this problem are: designing a battery structure with more reliable safety performance, coating a cera...