What are the characteristics of homogenization mixing equipment for lithium battery material slurry?

  The preparation of the lithium battery material slurry is the most critical part of the whole process, and the quality of the slurry will directly affect the next step of battery preparation. Slurry preparation is a non-Newtonian high-viscosity fluid formed by mixing active substances, adhesives, solvents, thickeners and other powders evenly. The fluid needs to have a certain viscosity, good fluidity and sufficiently small particle size . So, to achieve this effect, what kind of stirring equipment is needed for the preparation of lithium battery slurry?

1. The capacity is large enough
  Battery manufacturing requires more pole pieces and better consistency of the cells, which requires a certain consistency of the paste. In the actual mixing process, due to mixing operation, time, feeding sequence, material differences, etc., it is difficult for the slurry of different periods to achieve a high degree of uniformity. Therefore, we tend to choose a double planetary mixer with a certain capacity. The current large double planetary mixer can achieve 2000L. While having a large capacity, the mixing ability of the double planetary mixer is also a major test.

2. Have a good vacuum tight system
  The double planetary mixer needs a good vacuum closed system. There are three main reasons:

  ①During the mixing process, due to frequent collision and friction between the agitator and the material, and between the material and the material, a lot of heat will be generated and the temperature will rise. High temperature will cause part of the solvent to volatilize, and the organic gas produced may cause great harm to the human body.

  ②In the dry powder premixing stage, without a good vacuum closed system, dust will overflow, which will not only damage the working environment, but also cause harm to employees.

  ③There are large voids inside the powder. After mixing with the solvent, there will be many bubbles in the slurry, so the slurry needs to be defoamed.

3. The material of the double planetary mixer has strong corrosion resistance, wear resistance and stable physical and chemical properties
  Most of the lithium battery materials have the characteristics of strong alkalinity and strong corrosiveness, and they all need the double planetary mixer to have excellent corrosion resistance. The long-term mixing process requires the dual planetary mixer to have strong wear resistance and extend its service life.

Fourth, the mixer blade structure is reasonable, and the mixing speed design meets the requirements
  The design of the agitator blade structure has a great influence on the slurry preparation. First of all, it must be ensured that the mixing range of the agitator is large enough and there are no dead corners in the mixing container. The planetary mixer currently used in the larger double planetary mixer can ensure that the slurry is uniformly mixed without agglomeration. Secondly, the shape design of the agitator has an absolute influence on the dispersion, mixing, particle size distribution, fluidity, etc. of the material. In addition to the design of the main mixing shaft and blades, some equipment has a scraper design and a container rotation design to improve the efficiency of mixing and the degree of mixing of materials.

5. Safety of double planetary mixer
  The safety design of the double planetary mixer, including explosion-proof design, equipment safety emergency stop design, equipment stability, etc., is very important, because it guarantees the safety of the operator's life.