The anode of lithium battery is composed of anode active materials, conductive agent, battery binder and dispersant. The conventional anode electrode system is a water mixing process (the solvent is deionized water), so the incoming material does not require drying. This process requires: Conductivity of deionized water ≤1us/cm. Workshop temperature ≤40℃, Humidity :≤25%RH.
After confirmation of the material, prepare glue solution (CMC powder and water composition) first. Pour the graphite powder and conductive agent(Carbon black, CNTs, Graphene, etc.) into the battery slurry mixer for dry mixing. It is recommended that no vacuum should be pumped. Start the circulating water (the particle extrusion friction produces serious heat during dry mixing) at a low speed of 15 ~ 20rpm, and the scraping material circulates 2 to 3 times at an interval of 15 minutes. Then adjust the speed (low speed 35rpm, high speed 1200 ~ 1500rpm), and run 15min ~ 60min (depending on the wet process of each manufacturer).
Finally, pour the SBR binder into the mixer. It is recommended to stir quickly within a short time (SBR is a long-chain polymer, which is easy to break and lose its activity if the speed is too high and the molecular chain is too long for too long). It is recommended to stir at a low speed of 35-40 RPM and at a high speed of 1200 ~ 1800rpm for 10-20min.
The final viscosity (2000 ~ 4000 mPa. S), particle size (35um≤), solid content (40-70%), vacuum sifting (≤100 mesh). The specific process value needs to be different according to material properties, mixing process and so on. Workshop required: Temperature ≤30℃, Humidity ≤25%RH.