Isolating membrane of electrochemical device and preparation method of isolating membrane

Abstract

The invention relates to an isolating membrane of an electrochemical device and a preparation method of the isolating membrane. The method comprises the following steps: preparing a macromolecular solution,namely completely mixing a macromolecular material, a solvent and a ceramic precursor to form the macromolecular solution, so that the macromolecular material and the ceramic precursor are dissolved into the solvent; coating: coating the macromolecular solution on a porous base material; hydrolyzing: contacting the porous base material, which is coated with the macromolecular solution, with an aqueous solution so as to hydrolyze the ceramic precursor in the macromolecular solution to form ceramic particles; drying: completely removing the solvent and the water from the hydrolyzed porous base material to obtain the isolating membrane of the electrochemical device. The ceramic precursor and the macromolecular material can be completely dispersed and mixed, so the prepared isolating membrane of the electrochemical device can effectively enhance ionic conductivity, interface stability and high-temperature stability by means of the ceramic particles.

Description

technical field [0001] The invention relates to a preparation method of an electrochemical device isolation film, especially a process method of producing ceramic particles by hydrolysis of a ceramic precursor to prepare a porous polymer composite film in which inorganic particles are evenly distributed in a polymer material, which has low internal resistance and High cycle charge and discharge stability. Background technique [0002] Secondary lithium-ion batteries have the advantages of high energy density and long cycle life. Since their inception, they have rapidly replaced traditional secondary batteries such as nickel-cadmium and nickel-hydrogen. With the emergence of materials, the application fields of lithium-ion batteries have been continuously expanded. [0003] In consumer electronics or electric vehicle application markets, the safety requirements of lithium batteries are the most important product evaluation items, so materials and design work related to batte...

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, most of the existing technologies are directly adding ceramic particles to coat both sides of the original film to form a protective layer. This method is not only difficult to control the accuracy of the film thickness, but also difficult to grasp the dispersion of ceramic particles.

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