Production method of gel polymer electrolyte porous membrane

Abstract

The invention discloses a production method of a gel polymer electrolyte porous membrane and relates to the technical field of batteries. The method comprises the steps that S1, a polymer is added into a mixed solution of a solvent and a non-solvent, the mixed solution is sealed after being uniformly dispersed, the temperature is increased to 50-120 DEG C, stirring is performed for 1-4 hours, vacuum pumping is performed after cooling to remove bubbles, and a polymer solution is obtained; S2, the polymer solution obtained in the step S1 is uniformly spread on the surface of a base material, andthe base material after coating is baked under the temperature of 30-140 DEGC for 6-20min through a stage baking mode; and S3, the residual solvent and non-solvent on the base material obtained in the step S2 are removed thoroughly, and the gel polymer electrolyte porous membrane is obtained. Through the method, the porous polymer membrane can be produced continuously and quickly, production efficiency is high, and operation is easy; the prepared gel polymer electrolyte membrane is uniform in pore structure and high in porosity, has less solvent residues and is beneficial for improving the energy density of the batteries; lithium battery generation equipment can be directly used, the requirement on the equipment is low, cost is saved, and the membrane is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium battery polymers, in particular to a production method of a gel polymer electrolyte porous membrane. Background technique [0002] The physical form of the gel polymer electrolyte is a polymer network system swollen by a solvent, which does not contain a flowable flammable organic electrolyte, which can effectively improve the safety of lithium-ion batteries, and is conducive to the miniaturization of lithium-ion batteries. The development of light weight and high energy density is an important development trend of safe lithium-ion batteries in the future. [0003] The phase inversion method is one of the preparation methods of the gel polymer electrolyte laboratory. The preparation method is to pour the prepared polymer solution on a glass plate and use a small scraper to flatten the film, then dry naturally or heat in a blast drying oven to evaporate the solvent to obtain a porous polymer film....

AI Technical Summary

Problems solved by technology

However, the laboratory preparation method cannot be prepared in large quantities and cannot be industrialized. Therefore, it is necessary to develop a method for the industrial production of gel polymer electrolyte porous membranes.

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