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What is the production process of ternary cathode materials for 18650 lithium ion battery cell?
Production process flow of ternary cathode materials for 18650 lithium ion battery cell
The three main links in the production of ternary materials for 18650 lithium ion battery cell are mixing abrasives, high-temperature sintering, and crushing and decomposition. The control of each link and the performance of the equipment will have a direct or indirect impact on the final product. Among them, grading, screening and packaging are the final steps of ternary materials. Let’s take a look at these steps.
●Grading
The particle size distribution of ternary lithium battery materials will affect the material's specific surface area, compaction density, pole piece processing performance and battery electrical properties. The crushing equipment can only control the particle size of the material, but cannot control the particle size distribution of the material. If you want to control the particle size distribution of the material, you must use classification equipment. For the classification of ternary materials, an airflow classification device is generally added after the airflow pulverizer to directly classify the crushed products.
●Screening
In order to avoid foreign matter or coarse particles in the material, the lithium battery ternary materials also need to be screened. The Dmax of ternary materials is at least less than 50μm, but sometimes Dmax exceeds the standard. The vibrating screen has high screening efficiency, generally 80% to 95%; the particle size range of the screened raw materials is large, from more than 250mm to 0.1mm or 0.01mm; the output per unit area is large; it is easy to adjust and the screen holes are less blocked. This kind of screen requires special transmission equipment and consumes power.
●Packaging
Ternary lithium battery material packaging generally adopts vacuum packaging or vacuum and then filled with inert gas. There are many types of vacuum packaging machines, usually divided into mechanical extrusion type, intubation type, chamber conveyor type, rotary table type and thermoforming type. The principle of mechanical extrusion vacuum packaging is: after the packaging bag is filled, elastic items such as sponges are used on both sides to remove the air in the bag, and then the bag is sealed. This method is the simplest, but has a low vacuum degree and is used in situations where the vacuum degree is not high. The mass production technology of ternary cathode materials for 18650 lithium ion battery cell has just started, and it will take a long time to accumulate experience in terms of battery technology, supporting technology, application characteristics, safety strategies, etc. before it can embark on a bright road.
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