Homogenizing method of lithium ion battery positive electrode slurry

Abstract

The invention provides a homogenizing method of a lithium ion battery positive electrode slurry. The method comprises the following steps of: S1, feeding a positive active substance, conductive agentdry powder and binder dry powder into a double-planet stirrer one by one according to a ratio by using an automatic feeding system, and carrying out powder premixing to obtain a dry powder mixture; S2, dividing a solvent into two parts, adding a conductive agent slurry and one part of a solvent into the dry powder mixture prepared in S1 in proportion, and conducting first mixing to obtain a semi-finished product slurry; S3, starting a high-speed mixer, inputting the semi-finished product slurry obtained in S2 and another part of solvent into the high-speed mixer for high-speed mixing and dispersing, and pumping the mixed slurry into a circulation tank A; S4, inputting the slurry in the circulation tank A into the high-speed mixer again for high-speed mixing and dispersing, and pumping themixed slurry into a circulation tank B. The double-planet stirrer and the high-speed mixer are used at the same time, the slurry dispersion uniformity can be improved, and the slurry granularity consistency is better.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery production and manufacturing, and in particular relates to a method for homogenizing lithium ion battery cathode slurry. Background technique [0002] As hot topics such as energy conservation and emission reduction and environmental protection continue to ferment, new energy vehicle technology has developed rapidly in the past two years, and major OEMs have rapidly deployed in the field of new energy vehicles. One's lithium-ion power battery is also developing rapidly. In the past two years, the production capacity of major power battery factories has made great breakthroughs. In this competitive environment, reducing costs and increasing efficiency has become a hot topic in the power battery industry. [0003] In the production and manufacture of lithium-ion power batteries, homogenization is the first process, which not only directly determines the performance of lithium-ion batter...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: the time from feeding to discharging is more than 10 hours, the production efficiency and equipment utilization rate are very low. In mass production, it is necessary to purchase a large number of mixers to meet the production capacity requirements, so the equipment input cost and floor space are also very high. Big

However, this homogenization method has the following disadvantages: (1) The operation steps are cumbersome, and there are at least 15 times of operations such as feeding and parameter setting, and employees are prone to make mistakes in operation, which is not conducive to the use in normal mass production; (2) the bonding The agent is divided into two forms of powder and glue, and the method of adding multiple times is adopted; the requirements for the equipment measurement system are extremely high, and the cumulative error in the process will gradually increase, resulting in a deviation between the actual blanking weight and the theoretical blanking weight (3) The homogenization time is long, and the whole process needs at least 300 minutes, which is not conducive to efficient production, and the operating costs such as electricity bills increase; (4) The consistency of the slurry viscosity is poor, and the binder is added in multiple steps, resulting in free viscous The amount of binder is unstable, and the output viscosity will fluctuate greatly

The disadvantages of this method are: (1) The homogenization time is too short, and it takes about 10 minutes for the powder to go from the screw to the screw.

The disadvantage of this method is: all the solvents are added in the double planetary mixer. The high-speed dispersing mixer is a large-capacity mixer similar to the double planetary mixer. It uses all the materials to add in high-speed stirring, which will cause the problem of uneven mixing. Inconsistent slurry particle size

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