The ternary material for lithium ion batteries needs to strictly control the particle size and particle size distribution.

One of the important quality indicators of ternary materials is particle size and particle size distribution. The particle size and particle size distribution will affect the specific surface area, tap density, compaction density, processing properties and point chemical properties of ternary materials. Therefore, the ternary materials for lithium ion batteries need to strictly control the particle size and particle size distribution.

One of the important quality indicators of ternary materials is particle size and particle size distribution. The particle size and particle size distribution will affect the specific surface area, tap density, compaction density, processing properties and point chemical properties of ternary materials. Therefore, the ternary materials for lithium ion batteries need to strictly control the particle size and particle size distribution.

The pulverization can be subdivided into pulverization and grinding according to the particle size produced. Crushing refers to the process of breaking up large pieces of material into small pieces of material; grinding refers to the process of pulverizing small pieces of material into fine-shaped materials. When selecting the crusher, the type of crushed material, hardness, grain size of the feed and discharge, and production and construction site should be considered.

The ternary material is a secondary sphere obtained by agglomerating a single crystal of about 1 μm, and the secondary sphere has a particle diameter 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 burn-out rate of more than 24%, so the material is severely knotted, and it is necessary to first break the large-sized material of several centimeters into several millimeters by using a crushing device. Small pieces then use a grinding device to grind a few millimeters of powder into the final product.

Crushing process

The common ternary material process is: jaw crushing → roll crushing → airflow crushing. It should be noted that the pH value is greater than 10, which is an alkaline substance, and the pulverizing equipment needs to be resistant to alkali corrosion and wear.

Common ternary material crushing equipment

1, jaw break

The crushing method of the jaw crusher is a curved extrusion type, and the motor drives the belt and the pulley to move up and down through the eccentric shaft.

Advantages: large crushing ratio, uniform product size; simple structure, reliable operation; large adjustment range of material port.

Disadvantages: There is a idling stroke, which increases the non-productive power consumption; when the viscous material is broken, the production capacity is reduced, and even the clogging phenomenon occurs.

2, roll crushing

The roller crusher drives the roller through the motor and rotates in the opposite direction.

Advantages: simple structure, compact and light, low cost, able to crush sticky materials.

Disadvantages: low production capacity; cannot break large pieces of material, nor should it be used to break hard materials, usually used for medium and fine crushing of medium hard or soft materials.

3, Airflow pulverizer

The jet mill uses a high-speed airflow as a power source and a carrier to convert the airflow beam formed by the compressed air into velocity energy through a nozzle in the pulverizing chamber.

Factors affecting the airflow pulverization effect include initial particle size of the raw material, nozzle diameter, grading wheel rotation speed, working pressure, feed rate, and the like.

The jet mill mainly consists of a horizontal disc type jet mill, an O-type circulating tube jet mill, a jet mill, a target jet mill, and a fluidized bed jet mill.

4, mechanical crusher

Features:

■Low energy consumption: It combines centrifugal crushing, impact crushing and extrusion crushing, which can save energy by up to 40%~50% compared with other mechanical crushers.

■High fineness: equipped with self-flowing grading system, product fineness ≥ 2500 mesh.

■ Large feeding range: the feeding size is ≤10mm.

■Low wear: The grading part of the wearing parts is made of corundum ceramic material and has a long service life.

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