Lithium ion dry stirring process

Abstract

A lithium ion dry stirring process comprises the following steps of selecting 94-97 parts of active substance, 1-3 parts of conductive agent and 2-4 parts of binding agent powder according to parts bymass, adding the constituents into a stirring barrel, and performing uniform mixing to obtain powder particles, wherein the active substance is graphite; vacuumizing the stirring barrel so that the stirring barrel is in a vacuum state, adding a solvent into the stirring barrel at the first time, wetting the powder particles so that the solvent is absorbed onto surfaces of the powder particles, simultaneously stirring the powder particles to form a large shearing effect, and fully and uniformly mixing and wetting the powder particles to form a particle agglomeration body; adding the solvent into the stirring barrel at the second time, continuously maintaining stirring operation, and dispersing the particle agglomeration body under the shearing effect generated by stirring to form paste sothat the conductive agent is uniformly distributed; and adding the solvent into the stirring barrel at the third time, simultaneously maintaining stirring operation, diluting the paste, and adjustingviscosity of the paste. By the lithium ion dry stirring process, the molecule friction force of the powder particles during the kneading process is effectively reduced, and the heat energy generated by the kneading process is reduced.

Description

Technical field [0001] The invention relates to a lithium ion dry stirring process. Background technique [0002] At present, the mainstream mixing process for domestic power lithium batteries is wet mixing. Lithium batteries are used more and more widely, and the requirements are becoming more and more stringent. In order to meet the needs of the lithium battery market, major lithium battery manufacturers continue to optimize the lithium battery process. The first step of the slurry in the production process of lithium batteries, which occupies 30% of the process, plays a decisive role. [0003] Because the dry mixing process has significantly shortened the mixing process time, and the slurry stability and dispersion uniformity are also better, it is more and more widely used by manufacturers. Because of the great friction in the mixing and kneading process, it directly affects the uniformity of the split. The resulting heat energy is higher, and higher requirements are placed...

AI Technical Summary

Problems solved by technology

Due to the large friction force in the mixing and kneading process, it directly affects the effect of splitting and uniformity.

The resulting higher heat energy has higher requirements on the mixing equipment