Preparation method for negative electrode paste of lithium battery

Abstract

The invention proposes a preparation method for a negative electrode paste of a lithium battery. The preparation method comprises the following steps of: A, adding a thickener into a deionized water solvent, uniformly dissolving the mixture by using an agitating machine, and taking out the mixture for use; B, adding a negative active matter and a conductive agent into an agitating vessel according to a proportion, and agitating and dispersing the mixture; C, adding the thickener solution in an amount of 55-60% of the total quantity into a powder body after agitation, agitating and dispersing the mixture, and controlling the temperature of the paste to be 25-35 DEG C; E, carrying out viscosity test on the viscosity of the paste obtained in the step D, and directly forwarding into the next step if the viscosity is within a normal range of 2,000 to 5,000 Mpa.S; F, adding a binding agent again, and agitating and dispersing the mixture; and G, vacuumizing the vessel at an agitating state, thereby obtaining the prepared negative electrode paste. Compared with the traditional negative electrode paste preparation process, the preparation method has the advantages that the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation process and method of negative electrode material slurry. Background technique [0002] At present, with the shortage of global oil resources and the continuous deterioration of the climate environment, the development of human society is facing severe challenges. The development of clean and energy-saving new energy vehicles is highly valued by countries all over the world. The key to the development of new energy vehicles lies in their power sources. Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are currently the main power source for new energy vehicles. [0003] A lithium-ion battery generally includes a positive electrode sheet, a negative electrode sheet, and a separator spaced between the positive electrode sh...

AI Technical Summary

Problems solved by technology

This method first requires a long time for the dispersion of the conductive agent, which takes a long time and the dispersion state is not ideal, especially for the preparation of the slurry using carbon nanotubes (CNT), graphene, etc. as the conductive agent; secondly, the traditional process requires During the slurry preparation process, the stirring system is kept in a vacuum state, causing the internal temperature of the slurry system to rise easily, and at the same time, circulating water is added to the outside for cooling, so the requirements and wear on the equipment are very high

The above results in low slurry preparation efficiency, poor stability, and unsatisfactory effects, which will affect the preparation of subsequent pole pieces and the performance of lithium batteries.

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