Method for improving adhesion of slurry of pole piece of positive pole

Abstract

The invention provides a method for improving the adhesion of slurry of a pole piece of a positive pole, and a silane coupling agent is used for processing the surface for coating the slurry on the pole piece of the positive pole before coating the slurry. The silane coupling agent is adopted for processing a current collector of the positive pole before coating the slurry, thereby being capable of improving the adhesion of the slurry on the pole piece of the positive pole, improving the surface density of the slurry on the pole piece of the positive pole and having no material dropping off by visual observation. The silane coupling agent can further improve the durability and the thermal and wetting aging resistance of an adhesive.

Description

technical field [0001] The invention relates to battery manufacturing technology, in particular to a method for improving the adhesion of positive electrode sheet slurry. Background technique [0002] In the manufacturing process of lithium-ion batteries, the positive electrode material is prepared into a positive electrode slurry and then coated on the positive electrode current collector. In order to enable the positive electrode slurry to be better attached to the positive electrode current collector, a binder needs to be added to the positive electrode slurry to ensure a strong cohesive force between the positive electrode slurry and the positive electrode current collector. However, the current collector is generally made of metal materials (such as aluminum foil), and the surface tension of the current collector is relatively high. It will be difficult for the positive electrode slurry to effectively infiltrate the surface of the current collector, which seriously affe...

AI Technical Summary

Problems solved by technology

However, the current collector is generally made of metal materials (such as aluminum foil), and the surface tension of the current collector is relatively high. It will be difficult for the positive electrode slurry to effectively infiltrate the surface of the current collector, which seriously affects the adhesion between the slurry and the current collector.

The positive electrode slurry is an inorganic material, and the bonding effect between the positive electrode slurry and the current collector is poor, especially the bonding effect between the lithium iron phosphate positive electrode material and the current collector is even worse, and it is often necessary to add a large amount of binder. This increases the difficulty of making the pole piece, and the increase in the amount of binder used will also affect the performance of the battery