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Low-moisture ceramic slurry, and application thereof in lithium ion battery diaphragm

A ceramic slurry, low-moisture technology, used in battery pack parts, circuits, electrical components, etc., can solve the problems of many operation steps, difficult control, and difficulty in mass production, and achieve improved safety performance and excellent specific surface area. , the effect of improving hydrophobicity

Active Publication Date: 2020-01-03
DONGGUAN ADVANCED ELECTRONICS TECH
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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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  • Low-moisture ceramic slurry, and application thereof in lithium ion battery diaphragm
  • Low-moisture ceramic slurry, and application thereof in lithium ion battery diaphragm
  • Low-moisture ceramic slurry, and application thereof in lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of low moisture ceramic slurry, comprises the raw material of following percentage by weight:

[0035]

[0036] The ceramic slurry is prepared through the following steps:

[0037] 1) According to the weight ratio, disperse the ceramic powder, modified sodium polyacrylate and dispersant in deionized water A and add to the stirring equipment, heat to 20°C and stir for 80 minutes at the rotation rate of 1000r / min and the revolution rate of 25r / min to Stir well to obtain mixture A, set aside;

[0038] 2) Add the thickener to the mixture A obtained in step 1), and keep stirring at a rotation rate of 1000r / min and a revolution rate of 25r / min at 20°C for 20min until a stable dispersion system B is obtained, and set aside;

[0039] 3) Add the binder, wetting agent and polyvinyl alcohol into the dispersion system B at intervals of 25 minutes, the rotation rate of the binder and the wetting agent is 100r / min, and the revolution rate is 25r / min when stirring. After a...

Embodiment 2

[0053] A kind of low moisture ceramic slurry, comprises the raw material of following percentage by weight:

[0054]

[0055] The ceramic slurry is prepared through the following steps:

[0056] 1) According to the weight ratio, disperse the ceramic powder, modified sodium polyacrylate and dispersant into deionized water A and add to the stirring equipment, heat to 23°C and stir for 90 minutes at the rotation rate of 1100r / min and the revolution rate of 28r / min to Stir well to obtain mixture A, set aside;

[0057] 2) Add the thickener to the mixture A obtained in step 1), and keep stirring for 25 minutes at a rotation rate of 1100r / min and a revolution rate of 28r / min at 23°C until a stable dispersion system B is obtained, and set aside;

[0058] 3) The binder, wetting agent and polyvinyl alcohol were added to the dispersion system B at intervals of 28 minutes. The rotation rate of the binder and wetting agent was 110 r / min and the revolution rate was 28 r / min when stirrin...

Embodiment 3

[0072] A kind of low moisture ceramic slurry, comprises the raw material of following percentage by weight:

[0073]

[0074] The ceramic slurry is prepared through the following steps:

[0075] 1) According to the weight ratio, disperse the ceramic powder, modified sodium polyacrylate and dispersant into deionized water A and add to the stirring equipment, heat to 25°C and stir for 100min at the rotation rate of 1200r / min and the revolution rate of 30r / min to Stir well to obtain mixture A, set aside;

[0076] 2) Add the thickener to the mixture A obtained in step 1), and keep stirring at a rotation rate of 1200r / min and a revolution rate of 30r / min at 25°C for 30min until a stable dispersion system B is obtained, and set aside;

[0077] 3) Add the binder, wetting agent and polyvinyl alcohol into the dispersion system B at intervals of 30 minutes, the rotation rate of the binder and the wetting agent is 120r / min and the revolution rate is 30r / min when stirring, After addi...

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Abstract

The invention relates to the technical field of battery diaphragms, and concretely relates to a low-moisture ceramic slurry, and an application thereof in lithium ion battery diaphragms. The ceramic slurry comprises 25-30 wt% of a ceramic powder, 0.5-0.9 wt% of a dispersant, 17-21 wt% of a thickening agent, 3.4-3.8 wt% of a binder, 0.1-0.3 wt% of a wetting agent, 0.1-0.3 wt% of a defoaming agent,49-53 wt% of deionized water A and 0.1-0.5 wt% of modified sodium polyacrylate; and the ceramic slurry is prepared by the following steps: 1) dispersing the ceramic powder, the modified sodium polyacrylate and the dispersant in the deionized water A, and performing heating and uniform stirring to obtain a mixture A; 2) adding the thickening agent into the mixture A, and performing stirring to obtain a dispersion system B; and 3) sequentially adding the binder, the wetting agent and polyvinyl alcohol into the dispersion system B, performing stirring, and finally filtering the dispersed slurry to obtain the finished ceramic slurry. The hydrophobic dispersant is introduced, and the dispersant and the surface of the ceramic powder form super-hydrophobicity, so that the problem of high water content of the ceramic diaphragm is solved, and the yield of the lithium ion battery and the electrical properties of the product are favorably improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a low-moisture ceramic slurry and its application in lithium-ion battery diaphragms. Background technique [0002] With the advancement of science and technology, people have higher and higher requirements for the capacity density of batteries, lighter and 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 component material, play a role in preventing short circuits caused by contact between the positive and negative electrodes in the battery and providing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/632C04B35/634C04B35/636H01M2/16
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 DONGGUAN ADVANCED ELECTRONICS TECH
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