Lithium ion battery anode slurry as well as preparation method thereof, pole piece, and lithium ion battery

Abstract

The invention discloses lithium ion battery anode slurry as well as a preparation method thereof, a pole piece and a lithium ion battery. The preparation method comprises the following steps: S1, mixing an adhesive and a conductive agent at low speed to form mixed powder; S2, adding a part of a solvent in the mixed powder, and mixing to form a conductive glue solution; S3, mixing lithium iron phosphate powder and a part of the solvent at low speed to form wet powder; S4, adding a part of the conductive glue solution in the wet powder, stirring at high speed under vacuum, and uniformly mixing to form slurry; and S5, adding the residual conductive glue solution and the residual solvent in the slurry, stirring at high speed under vacuum, and uniformly mixing to form lithium iron phosphate lithium ion battery anode slurry. Powder mixing of the conductive agent and the adhesive is carried out in advance, and then the solvent is added to carry out dispersion, so that the aggregation behavior of the adhesive during dissolution is reduced, the dissolution rate of the adhesive is increased, the conductive agent is also dispersed together at the same time, the mixing time is shortened, the efficiency is improved, and the quality of the prepared slurry is improved.

Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode slurry, a preparation method thereof, a pole piece and a lithium ion battery. Background technique

[0002] Lithium iron phosphate lithium-ion battery is one of the best-selling automotive power batteries on the market at present, and has a very broad prospect. The first step in the manufacture of lithium iron phosphate batteries is slurry preparation, which is directly related to the product quality of the entire battery. At present, the mainstream lithium iron phosphate materials on the market are all nano-scale. Due to the small particle size, large surface area and huge surface energy of this material, it is easy to form agglomerates during production and processing, which affects the performance of the material. , leading to a decrease in battery performance.

[0003] At present, there are two traditional mixing methods: dry meth...

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