Burdening method of electrode slurry and electrode slurry prepared by adopting burdening method

Abstract

The invention relates to a burdening method of electrode slurry and the electrode slurry prepared by adopting the burdening method, the burdening method of the electrode slurry comprises the followingsteps: (1) measuring the minimum oil absorption values D1, D2... Dn, the maximum oil absorption values D<large>1, D<large>2... D<large>n and the corresponding masses m1, m2... Mn of each solid powder, wherein n>=2; (2) carrying out dry mixing on the solid powder to obtain mixed powder, and calculating the solvent amount g1 for wetting and the solvent amount g2 for diluting by adopting the oil absorption value and the quality data obtained in the step (1); (3) wetting the mixed powder to obtain primary slurry; and (4) diluting the primary slurry to obtain the electrode slurry. By calculating the critical point addition amount of the solvent in wetting and dilution, the acting force between particles is stabilized, and the obtained battery has more excellent performance.

Description

technical field [0001] The invention belongs to the field of battery batching technology, and in particular relates to a batching method of electrode slurry and the prepared electrode slurry. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products and electric vehicles because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and environmental friendliness. However, with the rapid development of the lithium-ion battery industry, the industry's lithium-ion battery price, performance and product delivery control competition is fierce, and low-cost, high-cost-effective batteries have become the wind vane of today's lithium-ion battery industry competition. In order to improve the competitiveness of batteries in the market, Battery products with high cost performance and short product delivery time are the magic weapon for success in the market. [0003] The batching proce...

AI Technical Summary

Problems solved by technology

The process is simple and easy to operate, but it also has relatively large defects: 1. The particle morphology, particle size, particle size distribution, particle volume fraction of different substances, and the zeta potential to measure the charged parameters of the particles inside the system etc. There are big differences, and it is vague and inaccurate to only use the solid content as the node

If the amount of solvent is too small to wet all the powder, then the dry powder will inevitably form a lump, and it will be difficult to open it later. At the same time, the slurry will move up along the stirring rod of the double planetary mixer until it reaches the top of the mixing tank. , that is, the "climbing rod" phenomenon, resulting in poor stirring effect; if the amount of solvent is too much, the slurry will flow easily, the effect of the shear force of the stirring paddle will be reduced, and the kneading and stirring will not be able to achieve the effect of kneading force, crushing and agglomeration , the dispersion effect of the actual slurry is not ideal

2. In the actual production process, the viscosity parameter of the final suspension slurry is an important indicator for us to judge whether the slurry can be coated. When we only use the solid content as the basis, the viscosity of the slurry fluctuates greatly. Can not meet the coating requirements, and even lead to slurry scrap

The battery slurry is compounded according to the mass percentage in the preparation process. Although the viscosity control process is carried out later, there is a problem that the dispersion effect of the slurry is not ideal in the preparation process, which affects the performance of the battery.

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