Negative electrode slurry dry-type preparation method

A negative electrode slurry, dry-type technology, applied in the field of dry-type preparation of negative electrode slurry, can solve the problems that the glue dispersion cannot be guaranteed, the overall stability of the slurry is at risk, and the overall production efficiency is reduced, so as to increase the utilization of the plant The effect of reducing the mixing rate, reducing the mixing steps, and shortening the mixing time

Pending Publication Date: 2022-01-28
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional wet kneading process ingredients process includes: glue preparation - active material mixed with part of the glue - kneading - adding the remaining glue - high-speed stirring - binder addition - high-speed stirring - vacuum elimination Soaking, the whole process generally takes 6 to 8 hours, the stirring time is too long, and the preparation of the glue requires additional equipment, which reduces the overall production efficiency
In addition, the amount of glue added in the wet kneading process is added in batches, and the dispersibility of the glue in the entire slurry cannot be guaranteed within a limited time. There is a risk in the overall stability of the slurry, and micellar flocculation will occur in the slurry , affecting the coating effect

Method used

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  • Negative electrode slurry dry-type preparation method
  • Negative electrode slurry dry-type preparation method
  • Negative electrode slurry dry-type preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A dry preparation method for negative electrode slurry, the preparation process steps are as follows figure 1 shown, including the following steps:

[0032] S1. Mix and stir the negative electrode active material and the thickener to obtain the first premix;

[0033] S2. Add part of the solvent into the first premix, stir, and dry knead to obtain the second premix;

[0034] S3. Add the remaining solvent into the second premix and stir to disperse to obtain the third premix;

[0035] S4. Add the binder into the third premix, stir and disperse, and reverse the stirring to remove the gas to prepare the negative electrode slurry.

[0036] Wherein, the stirring revolution speed in S1 is 15 rpm, and the dispersion time is 30 min.

[0037] Wherein, the ratio of parts by weight of the negative electrode active material, the thickener and the binder is 97.4:1.2:1.4.

[0038] Wherein, the parts by weight of the solvent added in the S2 is 35 parts, the solid content of the se...

Embodiment 2

[0042] The difference with embodiment 1 is:

[0043] Wherein, the ratio of parts by weight of the negative electrode active material, the thickener and the binder is 97.7:0.9:1.4.

[0044] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0046] The difference with embodiment 1 is:

[0047] Wherein, the ratio of parts by weight of the negative electrode active material, the thickener and the binder is 96.6:1.4:2.0.

[0048] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of battery slurry preparation, and particularly relates to a negative electrode slurry dry-type preparation method which comprises the following steps: S1, mixing and stirring a negative electrode active material and a thickening agent to obtain a first premix; s2, adding part of the solvent into the first premix, stirring, and performing dry kneading to obtain a second premix; s3, adding the residual solvent into the second premix, and stirring and dispersing to obtain a third premix; and S4, adding a binder into the third premix, and stirring and dispersing to obtain the negative electrode slurry. According to the dry-type preparation method of the negative electrode slurry, a conduction agent is not used, the step of preparing a glue solution is omitted, the dry mixing time is shortened, meanwhile, dry-type kneading can crush large-particle negative electrode active substances, the fineness of the slurry is reduced, and the stability and uniformity of the negative electrode slurry are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of battery slurry preparation, and in particular relates to a dry preparation method of negative electrode slurry. Background technique [0002] Lithium-ion batteries are currently the mainstream consumption of 3C and power batteries. With the rise of 5G and new energy vehicles, a new development trend has emerged, and they are currently the most competitive secondary batteries. As the first process of battery preparation, the homogenization process affects the dispersion effect of active materials and additives, the processing performance of pole pieces and subsequent processes, and is one of the key processes in the production of lithium-ion batteries. [0003] At present, the mainstream batching process of domestic 3C lithium-ion battery negative electrodes is the wet kneading process, and a few enterprises try the dry process. The traditional wet kneading process ingredients process includes: glue prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/1393H01M10/0525
CPCH01M4/587H01M4/1393H01M10/0525Y02E60/10
Inventor 陈杰
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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