A kind of gel electrolyte of polymer lithium ion battery

Abstract

The invention relates to the technical field of electrolytes of lithium-ion batteries, in particular to a gel electrolyte of a polymer lithium-ion battery. The gel electrolyte of the polymer lithium-ion battery comprises an organic electrolyte, lithium salts and additives, wherein the lithium salts are dissolved in the organic electrolyte; the additives comprise a gelator serving as a gel polymer electrolyte, a flatting agent and an accelerant; the gelator structurally comprises acrylate unsaturated double bonds and glycol. Due to the introduction of the acrylate gelator, a vulcanizing agent, the accelerant and the like dissolved in a liquid electrolyte, the electrolyte is liquid before being injected into the battery and can be gelated in a standing period and a first-time charge-discharge process after the electrolyte is injected into the battery. The acrylate selected as a gel component is a polymer with a certain molecular weight, so that the consumption of electricity in the forming process of an SEI (Solid Electrolyte Interphase) membrane functional group is reduced favorably; meanwhile, the compositions of an SEI membrane can be selectively controlled, and the synthesis of the SEI membrane outside the battery is realized by virtue of a chemical process. By virtue of part of elementary substance acrylate gel components, the using stability of an existing battery cell can be effectively improved.

Description

[0001] Technical field: [0002] The invention relates to the technical field of electrolytes for lithium-ion batteries, in particular to a gel electrolyte for polymer lithium-ion batteries. [0003] Background technique: [0004] Polymer lithium-ion battery (PLIB) is the third generation of new green and environmentally friendly lithium-ion battery developed on the basis of steel shell and aluminum shell batteries. It is thinner, lighter, safer, and easy to process into ultra-thin and various shapes. It has the advantages of excellent battery, excellent cycle performance, good low temperature performance and low expansion rate, etc., and is suitable for the development of miniaturization, thinning and lightening of electronic products. Therefore, it is more widely used in the electronic field and has a huge market potential. [0005] Although gel electrolytes have been commercially produced, the contradiction between the mechanical properties and ionic conductivity of gel ele...

AI Technical Summary

Problems solved by technology

[0005] Although gel electrolytes have been commercially produced, the contradiction between the mechanical properties and ionic conductivity of gel electrolytes has not been completely resolved.

Current preparation methods are often too complex and costly

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