One of the important quality indicators of ternary materials is the size and size distribution. The size and size distribution of ternary materials will affect the specific surface area, tap density, compaction density, processing performance and chemical properties of ternary materials. Therefore, the ternary materials for lithium ion batteries need to strictly control the particle size and particle size distribution.
â–²Common crushing equipment comparison
According to the size of the output particles, the comminution can be subdivided into grinding and grinding. Crushing refers to the process of breaking large pieces of material into small pieces of material. Grinding refers to the process of crushing small pieces of material into finely-shaped materials. When crushing machines are selected, the type, hardness, size of incoming and outgoing materials, and output and construction site of the broken material should be considered.
The ternary material is a secondary sphere formed by agglomerating single crystals of about 1 μm, and the secondary sphere has a particle size of 3 to 40 μm. After the mixture of the ternary material precursor and the lithium source is calcined at a high temperature in the crucible, there is a burning loss rate of more than 24%, so the material is severely compacted, and it is necessary to use a crushing apparatus to crush several centimeters of large materials into several millimeters. In small pieces, a few millimeters of small pieces are ground into a final product using a grinding apparatus.
Crushing process
The common ternary material flow is: jaw crushing, roller crushing, and airflow crushing. It should be noted that the pH value is greater than 10 and it is an alkaline substance. The crushing equipment needs alkali corrosion resistance and wear resistance.
â–²The ternary material commonly used smashing comparison table
â–²The ternary material commonly used smashing comparison table
Common ternary material crushing equipment
1, jaw crusher
The crushing method of the jaw crusher is a cranking extrusion type. The motor drives the belt and the pulley, and the movable shaft moves up and down through the eccentric shaft.
Jaw Crusher
Advantages: Large crushing ratio, uniform product particle size, simple structure, reliable work, large adjustment range of material mouth.
Disadvantages: There is a idling trip, which increases the non-productive power consumption; crushing wet and sticky materials will reduce the production capacity, or even clogging.
2, roller crushing
The roller crusher drives the roller through the motor and rotates in the opposite direction.
Double roll crusher working principle and structure diagram:
â–² Double-roller crusher
Advantages: simple structure, compact and lightweight, low cost, able to crush the sticky wet material.
Disadvantages: low production capacity; can not crush large pieces of material, nor should break the hard material, usually used for medium or fine pieces of medium or soft materials.
3, air flow crusher
The air flow pulverizer is powered by a high-speed air flow and a carrier, and the air beam formed by the compressed air is converted into velocity energy by a nozzle in the pulverization chamber.
The factors affecting the airflow crushing effect include the initial particle size of the raw material, the diameter of the nozzle, the speed of the grading wheel, the working pressure, and the feed rate.
The air flow crusher mainly consists of: horizontal disc type air flow pulverizer, O-type circulating tube air flow pulverizer, pair jet air flow pulverizer, target air flow pulverizer, and fluidized bed air flow pulverizer.
4, mechanical crusher
â–²Mechanical crusher
Features:
â– Low energy consumption: Centrifugal crushing, impact crushing, crushing and smashing are all in one, saving up to 40%~50% compared to other types of mechanical crushers.
■High fineness: equipped with self-separation classification system, product fineness ≥2500 mesh.
■Large material feeding range: feed size ≤ 10mm.
â– Low wear: Crushing graded parts wearing parts using corundum ceramic material, long service life.
â–²Comparison of the performance of air mill and mechanical mill
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