As the core equipment for the preparation of ternary materials, sintering equipment is generally used for sintering preparation in a fixed box-type muffle furnace during research and development.But in actual production, for higher production efficiency and suitable production cost, we must choose high-capacity sintering equipment such as roller kiln and rotary kiln.

The structure of different sintering equipment is different, and its structure has a great influence on the physical properties and electrochemical properties of ternary materials.

Box furnace:

The high-temperature sintering of materials in a box-type furnace is to install the materials in a sagger and then place them in the box, and the materials are in a static state in the furnace.

Roller kiln:

The high-temperature sintering of materials in the road kiln is to install the materials in the sagger, and then place them on the passing rollers, and the materials will advance in the furnace body through the rotation of the rollers;

The material is in the state of transmission and advancement in the furnace, advancing from the low temperature zone to the high temperature zone, so as to realize the process of material heating and high temperature insulation.

Rotary furnace

The high-temperature sintering of materials in the rotary kiln is to transport the materials into the rotating pipeline furnace, and the materials are turned and moved forward in the furnace through the rotation of the furnace;

The rotary kiln is a rotary cylinder with a small inclination angle to the horizontal line. When the cylinder rotates, the material in the cylinder moves forward gradually after being turned up and down on the inner wall of the cylinder with the transmission of the cylinder. The material is in a spiral state in the furnace, advancing from the low temperature zone to the high temperature zone, so as to realize the process of material heating and high temperature insulation.

Physical and chemical properties analysis of sintering results:

From the comparison results of physical and chemical properties of products in different sintering methods, it can be seen that from the analysis of material particle size, the particle size distribution D50 of the box furnace is larger, the roller kiln is slightly smaller, and the rotary kiln is obviously smaller; From sample 1 to sample 3, there is an upward trend, and the sintering results in the rotary kiln obviously increase the specific surface of the material. However, it can be seen from the scanning electron microscope that the primary particle size of the ternary material particles fired by the three sintering methods is similar. Due to the small particles produced during the sintering process of the rotary kiln, a new surface is added, which leads to an increase in the specific surface area.

Analyzing the discharge curve results of the fired materials in different sintering methods, it can be seen that according to the particle size of the fired materials according to different sintering forms, the discharge capacity of the box furnace and the roller kiln are close to each other, which are 144.5mAh/g and 144.1mAh/g respectively. As a result of kiln firing, the discharge capacity was 141.5mAh/g, which was significantly smaller.

Starting from the analysis of the differences of different sintering methods, the influence of different sintering methods on lithium-ion ternary materials was studied. The results showed that the results obtained by ternary materials in the roller kiln sintering method were similar to those obtained in the laboratory box furnace.

The reaction of the rotary kiln with higher production capacity is prone to material segregation and agglomeration; from the analysis of the physical and chemical characteristics of the sintered product and its electrical performance,

In the current production of lithium-ion ternary materials, the use of roller kilns is the first choice for rapid and stable mass production, while the rotary kiln will produce new small particles after sintering, the specific surface will increase and the battery capacity will decrease, which is more difficult for mass production. .