Battery slurry preparation method

Abstract

A method for making a battery slurry is disclosed. The method comprises providing a plurality of solid raw materials and at least one liquid raw material, the at least one liquid raw material is divided into a first part solvent and a second part solvent to be used; mixing the plurality of solid raw materials to obtain a dry powder; kneading the dry powder and the first part solvent to obtain a doughy mixture; and dispersing the doughy mixture to the second part solvent to obtain the battery slurry.

Description

technical field [0001] The invention relates to the technical field of battery pulping, in particular to a method for preparing battery slurry. Background technique [0002] In the preparation process of lithium-ion batteries, the pulping process plays an important role, and the quality of battery slurry will directly affect the process and quality of subsequent battery production. The existing pulping process is to add the active materials used in the positive and negative electrodes according to the proportion, the conductive agent, the binder, the additive and the solvent and other raw materials into the stirring and dispersing equipment (such as a planetary mixer) at one time, and after a certain amount of stirring It is used to make battery slurry. [0003] In the existing pulping process, due to the large difference in density between different types of solid powder (for example, the density of the active material spinel lithium manganate is 2.3g / cm 3 About, while th...

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Problems solved by technology

[0003] In the existing pulping process, due to the large difference in density between different types of solid powder (for example, the density of the active material spinel lithium manganate is 2.3g / cm 3 About, while the density of conductive agent carbon black is 0.4 g / cm 3 left and right), and the component content is also very different, so there is a problem of poor dispersion between different types of solid powder; and in the process of stirring, there is also the problem of powder dust, and the powder with low density is easier The flying sticks to the stirring and dispersing equipment, thereby changing the original configuration ratio of the battery slurry and causing waste of raw materials; in addition, solid powders are prone to agglomeration, so that the slurry contains larger particle sizes. particles

In order to obtain a slurry with uniform dispersion and small particle size, the existing pulping process must prolong the stirring time of the stirring and dispersing equipment, and even if the stirring time is long, the ideal battery slurry with uniform dispersion and small particle size cannot be obtained material

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