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What should be paid attention to when mixing lithium battery raw materials?

by:dcfpower     2021-03-19

The preparation of lithium battery pack positive (negative) electrode slurry is a mixing process that mixes positive (negative) electrode materials such as positive (negative) electrode active material, conductive agent, binder, etc., the mixing is the battery The active material and auxiliary materials are highly dispersed in a solvent to form a Newtonian high-viscosity fluid, which achieves the purpose of fully mixing and uniformly dispersing the active material, conductive agent, binder and other additives.

Points to note:

(1) The raw materials must meet the process requirements, such as the type of material and the amount of each component added;

(2) The positive electrode should not bring in moisture;

(3) The equipment should be dry and the indoor humidity should be controlled;

(4) The PVDF dissolution process is relatively slow, before pulping It is necessary to dissolve PVDF in NMP in advance. CMC is also a difficult solution. Dissolve CMC in water before pulping; PVDF and CMC must be fully dissolved and dispersed uniformly. If there are particulate binders or thickeners, the mixing time must be increased or Change the mixing process;

(5) After adding the conductive agent and the active material, the slurry should be uniform, without agglomerated particles, and the bubbles in the slurry should be removed, the positive electrode viscosity: 4000-

10000mpa.s, negative electrode viscosity: 1500mpa.s, slurry viscosity and solid content are very important to the coating process.

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