A kind of lithium battery cathode pulping process

Abstract

The invention discloses a lithium battery cathode slurry process, which comprises the following steps: (1) firstly preparing a conductive adhesive to obtain a conductive adhesive with a final solid content of 5.7% and a viscosity of 1200±500cp; The viscosity slurry is kneaded and pulped; (3) the positive electrode slurry is then infiltrated, and the solid content of the slurry is controlled to be 77.2% during infiltration; (4) the mass kneading is then performed, and the high-viscosity kneading solid content is 85.2%; (5) then Carry out NMP solvent dilution to dilute the slurry to a solid content of 82.7%; (6) then dilute the slurry in two steps to dilute the slurry to 75.4% and 70.0% respectively; (7) The final solid content of the finished slurry is 70% , the slurry viscosity is 7000±1000cp. The invention can effectively reduce the damage of the surface microstructure of the ternary positive electrode material, improve the consistency of the slurry, effectively disperse the conductive agent, and reduce the agglomeration of the conductive agent. It has the advantages of completeness, high controllability of coating quality.

Description

technical field [0001] The invention relates to a pulping process, in particular to a pulping process for a positive electrode of a lithium battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, good safety, excellent high and low temperature performance, no memory effect, and long cycle life. At present, they have been widely valued in the field of mobile energy storage and have become the preferred mobile energy storage products for current new energy vehicles. Continuously improving the safety performance of lithium-ion power batteries, reducing costs, and controlling consistency have become an urgent research content today. [0003] At present, lithium batteries include three major manufacturing processes, electrode, assembly, and aging. The manufacturing process of the electrode segment determines 60% of the electrochemical performance of the battery. Therefore, it is necessary to further explore the fabrication proces...

AI Technical Summary

Problems solved by technology

At present, the preparation of the slurry is still in the wet mixing stage. The dispersion disc will cause certain damage to the secondary particle structure ternary positive electrode material, increase the specific surface area of ​​the material, cause poor consistency of the slurry, and lead to a decrease in the performance of the battery. The kneading of the mixed slurry The application has a lot to explore further

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