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release time:2024-04-08 Hits: Popular:AG11 battery
3.7v 18650 lithium battery process flow
Today at a forum held by Gasgoo.com, I listened to Professor Yin from SJTU (who was my former colleague’s doctoral supervisor) talk about a lot of interesting things, especially about the fact that there are more than 100 lithium battery manufacturers in China. But craftsmanship is a great tragedy. Here we collect and organize some information about lithium battery technology. You need to confirm with professional colleagues before you can make a correct distinction between different batteries. Here is a concept first.
The process time chart of a certain manufacturer is as follows:
Another intuitive picture is:
3.7v 18650 lithium battery process flow
1. Positive electrode mixture
lBlending of raw materials:
(1) Dissolution of adhesive (according to standard concentration) and heat treatment.
(2) Ball milling of lithium cobalt oxide and conductive agent: The powder is initially mixed, and the lithium cobalt oxide and conductive agent are bonded together to improve the agglomeration and conductivity. After being formulated into a slurry, it will not be distributed alone in the binder. The ball milling time is generally about 2 hours; in order to avoid mixing in impurities, agate balls are usually used as ball milling mesons.
lDispersion and wetting of dry powder:
(1) Principle: Solid powder is placed in the air. As time goes by, part of the air will be adsorbed on the surface of the solid. After the liquid binder is added, the liquid and gas begin to compete for the solid surface; if the adsorption force between the solid and the gas If the adsorption force between the solid and the liquid is stronger than the adsorption force on the gas, the liquid can wet the solid and squeeze out the gas.
When the wetting angle is ≤90 degrees, the solid is wetted.
When the wetting angle is >90 degrees, the solid is not wetted.
All components in the cathode material can be wetted by the binder solution, so the cathode powder is relatively easy to disperse.
(2) The impact of dispersion methods on dispersion:
A. Standing method (long time, poor effect, but does not damage the original structure of the material);
B. Stirring method; rotation or rotation plus revolution (short time, good effect, but may damage individual
the material’s own structure).
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