Method for improving wettability of electrode plates of lithium-ion battery

Abstract

The invention discloses a method for improving wettability of electrode plates of a lithium-ion battery. The method comprises preparation of a positive electrode plate and a negative electrode plate, wherein preparation of the positive electrode plate and the negative electrode plate comprises a coating step, a drying step, a rolling step and a slitting step; a mirror grinding roller is sprayed with an anti-adhesion coating before rolling; and the anti-adhesion coating is prepared by the following methods: (1) high-temperature degreasing, namely baking the mirror grinding roller at 450-500 DEG C for 4-6 hours, and cleaning the surface with ethyl alcohol; (2) surface pretreatment, namely carrying out phosphating on the surface of the mirror grinding roller in the step (1); and (3) water curtain spraying, namely mixing teflon PTFE, silicon nitride, aluminum oxide, a curing agent VM7799 and water evenly to obtain slurry, and evenly spraying the surface of the mirror grinding roller with the slurry, wherein the ratio of the teflon PTFE to the silicon nitride to the aluminum oxide to the curing agent VM7799 to water is (20-25) to (10-12) to (10-12) to (15-20) to (40-45). The method disclosed by the invention is simple in process step and high in operability; and the wettability of the electrode plates of the lithium-ion battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a method for improving the wettability of lithium-ion battery pole pieces. Background technique [0002] Positive and negative pole pieces are important components of lithium-ion batteries, which are directly related to the electrical properties of lithium-ion batteries. The conventional manufacturing process of positive and negative pole pieces is coating→drying→rolling→slitting. However, the current rolling method of lithium-ion battery pole pieces is mirror roller rolling. Since the surface of mirror rolling rollers is relatively smooth, making The surface of the extruded pole piece is dense, which is not conducive to the infiltration of the electrolyte, resulting in a longer infiltration time during the battery manufacturing process, and the battery's rate performance and low-temperature performance are not good. Contents of the invention [0003]...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the surface of the pole piece in the prior art is dense, which is not conducive to the infiltration of the electrolyte, which leads to a longer infiltration time in the production process of the battery, and the battery’s rate performance and low temperature performance are not good. A method for improving the wetting performance of lithium-ion battery pole pieces, the invention has simple process steps and strong operability, and can greatly improve the wetting performance of lithium-ion battery pole pieces