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A low-moisture ceramic slurry and its application in lithium-ion battery separators

A ceramic slurry and low-moisture technology, which is applied to battery components, separators/films/diaphragms/spacer components, circuits, etc., can solve the problems of many operation steps, difficulty in large-scale mass production, and difficult control. To achieve the effect of solving high water content, which is beneficial to yield rate and electrical properties of products, and good hydrophobic performance

Active Publication Date: 2022-06-07
广东卓高新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has many operation steps, is difficult to control, and is not easy for large-scale mass production.

Method used

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  • A low-moisture ceramic slurry and its application in lithium-ion battery separators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A low-moisture ceramic slurry, comprising the following raw materials by weight:

[0045] Ceramic powder 25%

[0046] Dispersant 0.5%

[0047] Thickener 17%

[0048] Binder 3.4%

[0049] Wetting agent 0.1%

[0050] Polyvinyl alcohol 0.1%

[0051] Modified sodium polyacrylate 0.1%

[0052] The balance is deionized water A;

[0053] The ceramic slurry is prepared by the following steps:

[0054] 1) According to the weight ratio, disperse the ceramic powder, modified sodium polyacrylate and dispersant into deionized water A, add it to the stirring device, heat to 20°C, stir for 80min to 25r / min and 25r / min. Stir well to obtain mixture A, which is ready for use;

[0055] 2) Add the thickener to the mixture A obtained in step 1), and continue stirring for 20 minutes at a rotation rate of 1000 r / min and a revolution rate of 25 r / min at 20°C until a stable dispersion system B is obtained, for later use;

[0056] 3) Add the binder, the wetting agent and the polyvinyl a...

Embodiment 2

[0074] A low-moisture ceramic slurry, comprising the following raw materials by weight:

[0075] Ceramic powder 26%

[0076] Dispersant 0.6%

[0077] Thickener 18%

[0078] Binder 3.5%

[0079] Wetting agent 0.15%

[0080] Polyvinyl alcohol 0.15%

[0081] Modified sodium polyacrylate 0.2%

[0082] The balance is deionized water A;

[0083] The ceramic slurry is prepared by the following steps:

[0084] 1) According to the weight ratio, disperse the ceramic powder, modified sodium polyacrylate and dispersant into deionized water A, add it to the stirring equipment, heat to 23 °C, and stir for 90 min to Stir well to obtain mixture A, which is ready for use;

[0085] 2) Add the thickener to the mixture A obtained in step 1), and continue stirring for 25 minutes at a rotation rate of 1100 r / min and a revolution rate of 28 r / min at 23°C until a stable dispersion system B is obtained, for use;

[0086] 3) Add the binder, the wetting agent and the polyvinyl alcohol to the di...

Embodiment 3

[0104] A low-moisture ceramic slurry, comprising the following raw materials by weight:

[0105] Ceramic powder 27%

[0106] Dispersant 0.7%

[0107] Thickener 19%

[0108] Binder 3.6%

[0109] Wetting agent 0.2%

[0110] Polyvinyl alcohol 0.2%

[0111] Modified sodium polyacrylate 0.3%

[0112] The balance is deionized water A;

[0113] The ceramic slurry is prepared by the following steps:

[0114] 1) According to the weight ratio, disperse the ceramic powder, modified sodium polyacrylate and dispersant into deionized water A, add it to the stirring equipment, heat to 25°C, and stir for 100 min to Stir well to obtain mixture A, which is ready for use;

[0115] 2) Add the thickener to the mixture A obtained in step 1), and continue stirring for 30 minutes at a rotation rate of 1200 r / min and a revolution rate of 30 r / min at 25°C until a stable dispersion system B is obtained, for use;

[0116] 3) Add the binder, the wetting agent and the polyvinyl alcohol to the disp...

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Abstract

The invention relates to the technical field of battery diaphragms, in particular to a low-moisture ceramic slurry and its application in lithium-ion battery diaphragms, comprising the following raw materials in weight percentages: ceramic powder 25-30%, dispersant 0.5-0.9%, Thickener 17-21%, binder 3.4-3.8%, wetting agent 0.1-0.3%, defoamer 0.1-0.3%, deionized water A49-53% and modified sodium polyacrylate 0.1-0.5%; The ceramic slurry is prepared through the following steps: 1) disperse ceramic powder, modified sodium polyacrylate and dispersant in deionized water A, heat and stir evenly to obtain mixture A; 2) add thickener to mixture A , stirring to obtain dispersion system B; 3) Add binder, wetting agent and polyvinyl alcohol to dispersion system B in sequence and stir, and finally filter the dispersed slurry to obtain finished ceramic slurry. The present invention solves the problem of high water content of the ceramic diaphragm by introducing a hydrophobic dispersant to form superhydrophobicity with the surface of the ceramic powder, which is beneficial to the improvement of the yield of the lithium ion battery and the electrical performance of the product.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery separators, in particular to a low-moisture ceramic slurry and its application in lithium ion battery separators. Background technique [0002] With the advancement of science and technology, people have more and more requirements for battery capacity density, lighter weight, better cycle life, and lower self-discharge rate. Lithium-ion batteries can just meet the above requirements, so they are widely used. In the defense industry, electric industry, 3C industry and other fields. [0003] Lithium-ion batteries are mainly composed of key materials such as positive electrode materials, negative electrode materials, lithium-ion battery separators and electrolytes. Lithium-ion battery separators, as an important material, play a role in preventing short-circuits between positive and negative electrodes in the battery and providing lithium ion transport channels. And in the case of overch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/434H01M50/409H01M50/403H01M50/40C04B35/10C04B35/632C04B35/634C04B35/636
CPCC04B35/63404C04B35/632C04B35/63488C04B35/63436C04B35/6365C04B35/63452C04B35/63456C04B35/63408C04B35/10C04B2235/3206H01M50/431Y02E60/10
Inventor 曾玖任王晓明杨浩田李雪
Owner 广东卓高新材料科技有限公司
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