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Ceramic coating diaphragm slurry, ceramic composite diaphragm, preparation method and application thereof

A technology of ceramic slurry and ceramic coating, which is applied in the direction of structural parts, electrical components, battery pack parts, etc., can solve problems such as decomposition and battery performance degradation, and achieve improved safety, improved pressure and temperature resistance, and environmental protection. friendly effect

Active Publication Date: 2021-08-27
湖南烁普新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of ceramic material particles represented by alumina and boehmite contains a large number of hydrophilic groups, which can easily absorb water during the preparation of composite separators.
Residual moisture in the battery will cause the electrolyte to decompose, resulting in a decrease in battery performance

Method used

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  • Ceramic coating diaphragm slurry, ceramic composite diaphragm, preparation method and application thereof
  • Ceramic coating diaphragm slurry, ceramic composite diaphragm, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Aluminum oxide, styrene-maleic anhydride copolymer, and deionized water were mixed and stirred for 3 hours at a mass ratio of 1:0.002:1.2 to obtain a ceramic dispersion.

[0038] (2) Add a water blocking agent to the ceramic dispersion. The water blocking agent is an amphiphilic polymer with a number average molecular weight of 300,000. The amphiphilic polymer includes a hydrophilic end and an lipophilic end, and the hydrophilic end is a methacrylic acid chain. segment, the lipophilic end is a multi-branched alkyl group. The mass of the water-blocking agent is 2% of the mass of the ceramic dispersion to obtain a flocculated ceramic slurry.

[0039] (3) Grind and disperse the flocculated ceramic slurry with a grinder, which uses high-purity zirconia microbeads with a particle size of 0.3 mm for grinding. The speed of the grinder is 1200 rpm, and the particle size of the resulting slurry is less than 2 μm. During the grinding process, a water-blocking agent was added...

Embodiment 2

[0044] (1) Boehmite, polyacrylic acid, sodium dodecylbenzenesulfonate, and deionized water were mixed and stirred for 1 hour at a mass ratio of 1:0.003:0.003:2.3 to obtain a ceramic dispersion.

[0045] (2) Add a water blocking agent to the ceramic dispersion. The water blocking agent is an amphiphilic polymer with a number average molecular weight of 600,000. The amphiphilic polymer includes a hydrophilic end and an lipophilic end, and the hydrophilic end is a methacrylic acid chain. segment, the lipophilic end is a mellitic acid ester group. The mass of the water-blocking agent is 1% of the mass of the ceramic dispersion liquid, and a flocculated ceramic slurry is obtained.

[0046] (3) Grind and disperse the flocculated ceramic slurry with a grinder, which uses high-purity zirconia microbeads with a particle size of 1.2 mm for grinding. The grinder speed is 500 rpm, and the particle size of the obtained slurry is less than 2 μm. During the grinding process, a water blockin...

Embodiment 3

[0051] (1) Magnesium hydroxide, zirconium oxide, sodium aryl naphthalenesulfonate, and deionized water were mixed and stirred for 1.5 hours at a mass ratio of 1:1:0.003:3.6 to obtain a ceramic dispersion.

[0052] (2) Add a water blocking agent to the ceramic dispersion. The water blocking agent is an amphiphilic polymer with a number average molecular weight of 400,000. The amphiphilic polymer includes a hydrophilic end and an lipophilic end, and the hydrophilic end is polymethacrylic acid Ester segment, the lipophilic end is 1,4,5,8-naphthalene tetracarboxylate. The mass of the water-blocking agent is 3% of the mass of the ceramic dispersion liquid, and a flocculated ceramic slurry is obtained.

[0053] (3) Grind and disperse the flocculated ceramic slurry with a grinder, which uses high-purity zirconia microbeads with a particle size of 0.8 mm for grinding. The speed of the grinder is 1500 rpm, and the particle size of the obtained slurry is less than 2 μm. During the grin...

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Abstract

The invention provides an ultra-low moisture ceramic coating diaphragm slurry, a ceramic composite diaphragm, a preparation method and application thereof. The preparation method of ceramic coating diaphragm slurry comprises: mixing and stirring ceramic material, dispersant, and deionized water to obtain a ceramic dispersion; adding a water blocking agent to the ceramic dispersion to obtain a flocculated ceramic slurry; Grinding and dispersing the ceramic slurry to obtain a water-blocking ceramic dispersion; mixing and stirring the water-blocking ceramic dispersion, a binder, a thickener and a surface wetting agent to obtain a ceramic-coated diaphragm slurry. Then, the ceramic coating membrane slurry is evenly coated on the base membrane, and an ultra-low moisture ceramic composite membrane is obtained after drying treatment. The above preparation method is environmentally friendly, simple in process and low in cost. The ceramic coating membrane slurry prepared by the method has high stability, the prepared ultra-low moisture ceramic composite membrane has low water content and high thermal stability, and the lithium ion battery prepared by the membrane has high cycle performance and safety.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a ceramic coating diaphragm slurry, a ceramic composite diaphragm and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and high safety performance, and are widely used in portable digital electronic products such as personal computers, cameras, and mobile phones. Lithium-ion battery is a kind of concentration difference battery, its working process is Li + The process of intercalation and deintercalation back and forth between the positive and negative electrodes is vividly called "rocking chair battery". A typical lithium-ion battery usually consists of a separator, electrolyte, positive and negative electrodes. The positive electrode is generally a compound of transition metal oxide and lithium (such as lithium cobaltate, lithium manganate, etc.), and the negative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/434H01M50/446H01M10/0525H01M50/443H01M50/449H01M50/489
CPCH01M10/0525H01M50/403H01M50/431Y02E60/10
Inventor 吴秀锋钟海燕张杨肖欢张鹏孙先维雷建清蔡滔罗建
Owner 湖南烁普新材料有限公司
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