Preparation method of anode paste for lithium-ion power battery

Abstract

The invention discloses a preparation method of an anode paste for a lithium-ion power battery. The anode paste is prepared from an active material, a conductive agent, a dispersing agent, a binder and a solvent; the preparation method comprises an order of mixing various components in the anode paste; and the method is characterized in that mixing is carried out by the following four steps: (1) carrying out high-speed stirring and dry mixing on the active material and the conductive agent; (2) adding the dispersing agent, and carrying out dry mixing on the dispersing agent and black powder obtained in the step (1); (3) adding the solvent, introducing condensate water, carrying out high-speed stirring and dispersing after low-speed stirring, carrying out fractioning and vacuum supply and further carrying out high-speed vacuum mixing; and (4) adding the binder, and dispersing and mixing the binder. A dry mixing technology is utilized; and the solvent is added once, so that the paste mixing time is shortened; the machine loss caused by a high solid content is reduced; the capacity is improved; and a relatively good mixing effect is obtained.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a preparation method of a lithium ion power battery negative electrode slurry. Background technique [0002] Lithium-ion power batteries have the advantages of high specific energy, light weight, good cycle performance, small self-discharge, no memory effect, wide working range and environmental protection, and their application range is becoming wider and wider. In general lithium-ion power batteries, the negative electrode is made of micron-sized traditional graphite materials such as artificial graphite, natural graphite, hard carbon or soft carbon. However, the conductivity of a single micron-scale graphite negative electrode is not very good, so adding nano-scale superconducting carbon black to the negative electrode material improves its conductivity. [0003] The traditional negative electrode slurry is prepared by wet mixing, that is, first glue (preparat...

AI Technical Summary

Problems solved by technology

This method takes a long time to prepare the negative electrode slurry, the utilization rate of the equipment is low, the production capacity is relatively low, and the nano-sized particles are easy to aggregate into large particles, which will affect the subsequent coating process.

The dry mixing process that emerged in the later period uses two sets of equipment, one is used for glue making, the other is used for dry mixing of powder materials, and finally the glue liquid and powder materials are mixed. This method has short mixing time and high efficiency, but at the same time high equipment cost

Images