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Electrode paste preparation method

A technology of electrode slurry and conductive agent, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as large surface area, poor dispersibility of nanoparticles, and small particle size

Active Publication Date: 2017-01-04
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that due to the small particle size and large surface area of ​​nanoparticles, the dispersibility of nanoparticles will be relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] 1. Preparation of cathode slurry

[0089] The formulation of the positive electrode slurry is shown in Table 1.

[0090] Table 1

[0091]

[0092] 1) Prepare positive electrode binder solution

[0093] The solid content of the positive electrode binder solution was 10%. PVDF was added to the solvent NMP twice. The stirring process and effect are shown in Table 2. The stirring temperature was 45° C. and it took about 4 hours to obtain the positive electrode binder solution.

[0094] Table 2

[0095]

[0096]

[0097] 2) Preparation of conductive agent solution

[0098] The preparation of the conductive agent solution is carried out substantially simultaneously with the preparation of the positive electrode binder solution. The conductive agent is mixed with the solvent NMP and then stirred. First, weigh the solvent NMP and add it to the stirring pot, then add the conductive agent twice, the first time to add SP type carbon black conductive agent, the second...

Embodiment 2

[0127] In the preparation method of the electrode slurry described in the present invention, it is also possible to add 10-60% of the binder solution or thickener solution after the conductive agent solution is prepared, stir evenly, and then add in batches active substance and remaining binder solution or thickener solution.

[0128] To prepare the positive electrode slurry in this example, first add 30% binder solution to the conductive agent solution. The specific stirring process is shown in Table 9. The stirring temperature is 25°C. After stirring evenly, add the active material and remaining binder solution. The preparation method of the binder solution is the same as in Example 1, and the addition method and stirring process of the active substance and the remaining binder solution are the same as in Example 1.

[0129] Table 9

[0130]

[0131] In Example 2, during the preparation of the electrode slurry, part of the binder solution is first added to the conductiv...

experiment example 1

[0141] The dispersion effect of experimental example 1 different preparation methods

[0142] After stirring the positive and negative electrode slurries obtained in Example 1 and Comparative Example 1, they were screened and coated to obtain positive and negative electrode sheets. Scanning electron microscopy was carried out on the positive and negative electrodes to investigate the effect of slurry stirring. The electron microscope model is FEIQuanta650F.

[0143] Depend on Figure 4 to Figure 7 It can be observed that the uniformity of the slurry obtained by using the preparation method of the present invention and the traditional preparation method is significantly different after being coated respectively, and the specific comparison results are shown in Table 12.

[0144] Table 12

[0145]

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Abstract

The invention relates to an electrode paste preparation method. The method includes the following steps that firstly, a first granular substance is added to a solvent to be mixed; secondly, selectively, an adhesive solution and / or a thickener solution are / is added into the solution obtained in the first step and mixed; thirdly, a second granular substance and an (n-1)th granular substance are added into the solution obtained in the second step by repeating the mode in the first and second steps; fourthly, an nth granular substance is added into the solution obtained in the third step and mixed; fifthly, selectively, thickener is added into the solution obtained in the fourth step and mixed; sixthly, an adhesive is added into the solution obtained in the fifth step and mixed, and electrode paste is obtained. According to the electrode paste obtained through the method, dispersion uniformity of the components is obviously improved, stirring time is shortened, and production efficiency is improved. The electrode paste obtained through the method can be manufactured into a pole piece and assembled into a lithium ion battery, the capacity of the battery is given full play of, consistency is high, and the cycle life is long.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a preparation method of electrode slurry. Background technique [0002] In the manufacturing process of lithium-ion batteries, the slurry mixing process is an important process. Lithium-ion electrode paste generally includes positive and negative active materials, conductive agents, and binders. In order to improve the dispersibility, stability and other properties of the electrode slurry, additives such as stabilizers, dispersants or surfactants can also be added to the slurry. In addition, in order to improve other performances of the battery, other functional additives, such as nano-alumina, can also be added to the slurry. In the positive and negative electrode slurries, the dispersion and uniformity of granular active materials, conductive agents and functional additives will affect the movement of lithium ions between the two electrodes of the battery, so the slurry of ea...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/131B01F13/06H01M10/0525
CPCH01M4/131H01M4/139H01M10/0525B01F33/70Y02E60/10
Inventor 钟宽钟署亮李乾乾王晋
Owner GREE ELECTRIC APPLIANCES INC
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