Preparation method of lithium ion battery cathode slurry

Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of lithium ion battery positive electrode slurry. The method comprises the following steps: S1, adding a conductive agent into a dispersing agent, and performing stirring and dispersing to obtain a conductive agent dispersion liquid with the solid content of 0.5-3%; S2, dissolving an adhesive in a solvent, and acquiring an adhesive solution with the solid content being 5-9%; S3, adding the adhesive solution into the conductive agent dispersion liquid, performing pre-stirring,and then fully stirring to obtain mixed slurry; S4, adding a positive electrode active material into the mixed slurry, performing pre-stirring, and then fully stirring to obtain positive electrode slurry with the solid content of 58-65%; wherein the step S1 and the step S2 are simultaneously carried out, the step S1 is firstly carried out and then the step S2 is carried out, or the step S2 is firstly carried out and then the step S1 is carried out. Compared with the prior art, the preparation method is high in preparation efficiency, the prepared positive electrode slurry is uniformly dispersed and good in stability, and the overall performance of the lithium ion battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode slurry of a lithium ion battery. Background technique [0002] Lithium-ion batteries have been receiving great attention in consumer electronics and power products due to their high operating voltage, high energy density, long cycle life, safety and environmental protection. Lithium-ion batteries are mainly composed of positive electrode sheets, negative electrode sheets, separators, and electrolytes. The preparation of positive electrode sheets requires the preparation of positive electrode slurry, coating, and rolling. When preparing the positive electrode of lithium-ion batteries, the positive electrode The uniformity and stability of the slurry have a non-negligible impact on the performance of lithium-ion batteries. [0003] During the preparation of positive electrode slurry, it is necessary to disperse...

AI Technical Summary

Problems solved by technology

Due to the irregular surface morphology of many active materials, especially the surface of large particles presents different degrees of depressions, these depressions easily lead to the aggregation of conductive agent and binder powder when dry powder is mixed, and the surface binder of the powder aggregation part after adding solvent Dissolution, under the condition of ultra-high viscosity stirring, it is squeezed more densely, so that the conductive agent and binder inside the pit cannot be wetted and dissolved by the solvent, and the prepared slurry is unevenly dispersed and the viscosity rebounds greatly under the shelving state

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