Preparation method of lithium ion battery anode slurry

Abstract

The invention provides a preparation method of lithium ion battery anode slurry with which effective control can be taken upon the consistency of a lithium ion battery in a micro perspective. The lithium ion battery anode slurry is prepared from mixed materials of a solvent, polyvinylidene difluoride, a conductive agent, and a lithium iron phosphate anode material. The preparation method comprises steps that: the solvent, polyvinylidene difluoride, the conductive agent, and the lithium iron phosphate anode material are well mixed under a temperature environment of 65 to 70 DEG C, such that the lithium ion battery anode slurry is prepared. According to the invention, during the whole slurry preparation procedure, the whole slurry system is maintained to be in a constant high temperature; with a method wherein the raw materials and the solvent are added to the slurry system in batches, the viscosity of the slurry system is controlled within a certain range; before a bonding agent is added, all solid powders are premixed by using the solvent, such that the components of the slurry are subject to more severe molecular motions under a temperature higher than that of a common slurry mixing technology. Therefore, electrode slurry with a better consistency in the micro perspective is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of a positive electrode slurry of a lithium ion battery. Background technique [0002] Electric vehicles have the characteristics of low carbon and environmental protection, and are the future development direction of automobiles. With the development of electric vehicle technology, automobile manufacturers have increasingly urgent requirements for improving the performance of lithium-ion power batteries used in electric vehicles. The consistency of lithium-ion power batteries used in electric vehicles is the biggest bottleneck restricting the development of the entire electric vehicle technology. [0003] At present, the methods to solve the consistency of the single battery mainly focus on the following methods: 1. Use a high-precision coating machine to improve the consistency of the amount of coating in the horizonta...

AI Technical Summary

Problems solved by technology

During the production process of the traditional slurry mixing process, the whole system is at a relatively low temperature. In this low temperature state, the molecular diffusion of the positive electrode material, PVDF, conductive agent (SP or CNT), solvent and other components is relatively slow. When mixing pulp, only rely on machinery to mix the above substances with each other, so the dispersion effect is relatively poor, resulting in unsatisfactory consistency of the slurry on the microscopic scale