Slurry mixing process of lithium ion battery slurry

Abstract

The invention discloses a slurry mixing process of lithium ion battery slurry. The slurry mixing process comprises the steps of: glue ejection: adding a binder and a solvent accounting for 50-70% of the total dosage into a double planetary agitator for high-speed stirring; dry mixing: pre-mixing an active material and a conductive agent in a powerful mixer for 4-20 minutes; mud-like stirring: adding a powder premix into glue prepared in the double planetary agitator for mud-like stirring; high-viscosity stirring: adding a solvent accounting for 15-25% of the total dosage into the double planetary agitator for high-viscosity stirring; high-speed stirring: adding a solvent accounting for 15-25% of the total dosage into the double planetary agitator for high-speed vacuum stirring; and defoaming: controlling a revolution speed of the double planetary agitator at 15 rpm / min and and controlling a dispersion speed at 0, performing low-speed vacuum defoaming, and stirring for 15-30 min to obtain the slurry. By adopting the slurry mixing process disclosed by the invention, the slurry can be dispersed more uniformly, the slurry has good sedimentation stability and rheological characteristics, and the slurry mixing process disclosed by the invention has the advantages of short time, low cost, low energy consumption and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and relates to a slurry mixing process of lithium ion battery slurry. Background technique [0002] With the gradual intensification of competition in the new energy electric vehicle industry, the current market competition for power lithium-ion batteries is also becoming increasingly fierce. Lithium-ion batteries, as one of the mainstream technical route products, have gradually entered the performance-cost-equal stage from the stage of purely comparing performance. stage. [0003] The pulping process is the most important link to ensure the quality of batteries in the entire production process of lithium-ion batteries. In the electrode manufacturing of lithium-ion batteries, the positive and negative electrode slurries are basically composed of active materials, polymer binders, solvents and conductive agents. Regardless of the positive electrode slurry or the negati...

AI Technical Summary

Problems solved by technology

This wet slurry mixing process has a wide range of applications and lower performance requirements for equipment. However, in the preparation process, various conductive agents and active materials need to be dispersed step by step, and the conductive agent is difficult to disperse and easily agglomerates. , especially when the local concentration of the conductive agent is too high during feeding, severe agglomeration will occur, and the bonding effect of the binder will increase the particle size of the slurry, which will affect the uniformity and fluidity of the slurry, and ultimately affect the lithium impact on the performance of ion batteries

Although the slurry can be filtered after the slurry is mixed, this can only remove the agglomerated raw materials with larger particle sizes, and the larger agglomerated particles that can pass through the filter layer will still affect the fluidity of the slurry and be filtered out. The filter residue becomes waste, which not only seriously affects the utilization rate of raw materials, but also increases the cost

The whole pulping process usually takes 13-15 hours, the pulping time is long, the kinetic energy consumed in the production process is high, and the production efficiency is low