A method for stirring positive electrode slurry

Abstract

The invention relates to a method for stirring positive electrode slurry. The positive electrode slurry includes a solvent, a positive electrode active material, and a conductor; the density of the positive electrode active material is greater than the density of the conductor; the method includes: adding the positive electrode slurry to n reaction chambers for stirring process, the Said n≥2; in said n reaction chambers, the liquid above the liquid level above h circulates in each reaction chamber, and said h accounts for ≥3% of the total liquid level height; said each The actual use volume of the reaction chamber is <300L. In the present invention, through the selection of the reaction chamber, the control of the stirring process (speed and stirring blades), and the circulation setting, the present invention can effectively prevent small-density suspended matter such as graphite from floating on the liquid surface, and avoid the gap between each parallel stirring chamber. There is a concentration difference between them, and then the effect of avoiding the use of maleimide-barbituric acid to solve the sedimentation of the positive electrode active material can be achieved.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, and in particular relates to a method for stirring positive electrode slurry. Background technique [0002] The existing positive electrode materials are mainly composed of positive electrode active materials, conductive agents, lithium salts and binders, and most of the positive electrode active materials are layered metal oxides with a certain crystal structure (such as LiCoO 2 etc.), the conductive agent is usually carbon materials such as graphite, carbon black, carbon fiber, etc., and the binder mainly plays a role in bonding between the active material layers, and is used for bonding between the active material layer and the current collector. , the density of the positive electrode active material is much higher than that of the conductive agent and the binder, and with the increasing demand for energy density and the use of ternary materials, this density difference tends to g...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem in the prior art that the density of positive electrode active materials is relatively high, while the density of conductive agents of carbon materials such as graphite is relatively low, in the actual industrial production process, it is very easy to cause sedimentation. The purpose of the present invention is to provide a positive electrode slurry Material stirring method, the method can avoid the use of maleimide-barbituric acid to solve the problem of positive electrode active material sedimentation

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