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Adhesive diaphragm and preparation method thereof

A technology of adhesion and diaphragm, which is applied in the direction of structural parts, final product manufacturing, climate sustainability, etc., can solve the problem of sudden drop of heat shrinkage performance coating diaphragm, and achieve the effect of solving heat shrinkage performance and saving production costs

Active Publication Date: 2022-06-24
JIANGSU ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides an adhesive diaphragm and a preparation method thereof. Large-particle adhesive polymer particles are added to the ceramic particle coating and coated by roller coating. The requirement of adhesive force also solves the problem that the thermal shrinkage performance of the ceramic and cohesive polymer particle mixed coating diaphragm drops suddenly compared with the full ceramic coating diaphragm, and the diaphragm omits the step of coating, effectively saving cost of production

Method used

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  • Adhesive diaphragm and preparation method thereof
  • Adhesive diaphragm and preparation method thereof
  • Adhesive diaphragm and preparation method thereof

Examples

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preparation example Construction

[0045] The present invention also provides a preparation method of the adhesive diaphragm, and the preparation of the above-mentioned adhesive diaphragm includes the following steps:

[0046] Step 1, configure the aqueous slurry of ceramic particles and adhesive polymer particles 30;

[0047] Mix ceramic particles, cohesive polymer particles 30, inorganic glue, water-based glue, coupling agent, ethanol and deionized water, and fully stir the slurry uniformly;

[0048] Wherein, the ceramic particles include: first ceramic particles 21 and second ceramic particles 22, the particle size D50 of the first ceramic particles 21 is 100nm-800nm, the particle size of the second ceramic particles 22 is 20nm-200nm, and the adhesive polymer particles 30 The particle size D50 is 2μm-20μm;

[0049] Step 2, coating the slurry prepared in step 1 on the substrate 10, and drying the slurry to form a ceramic particle coating 20 on the substrate 10 to obtain an adhesive diaphragm;

[0050] Where...

Embodiment 1

[0061] Step 1: Formulation of the aqueous slurry of ceramic and polymer.

[0062] Mix ceramic particles, cohesive polymer particles, inorganic glue, water-based glue, coupling agent, deionized water. Among them, the inorganic particles include ceramic particles and ceramic particles in the inorganic glue, and the mass ratio of the inorganic particles and the binding polymer particles is 8:2, and the water-based glue PVA accounts for 1% of the mass sum of the inorganic particles and the binding polymer particles. , the coupling agent is γ-glycidyl ether oxypropyl trimethoxysilane, which accounts for 2.5% of the mass sum of the inorganic particles and the adhesive polymer particles. Add 0.2% wetting agent and stir well to prepare a uniform slurry with a solid content of 20%.

[0063] Among them, the cohesive polymer particles are PVDF, and the particle size D50 is 8.45 μm.

[0064] Among them, the ceramic particles are the first boehmite and the second boehmite, and the mass r...

Embodiment 2

[0069] The difference from Example 1 is that the ceramic particles are the first boehmite, and the particle size D50 is 530 nm. The dry weight ratio of ceramic particles and aluminum sol is 7:3. After drying, the separator S2 was obtained, and the surface density of the single-sided coating was 1.80g / m 2 .

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Abstract

The invention relates to the technical field of lithium batteries, in particular to an adhesive diaphragm and a preparation method thereof. The ceramic particle coating is fixedly arranged on one side or two sides of the base material, the ceramic particle coating is composed of a plurality of ceramic particles, the ceramic particle coating comprises adhesive polymer particles, the thickness of the ceramic particle coating is set as X, the particle size of the adhesive polymer particles is set as Y, the particle size of the ceramic particles is set as Z, and the relation between X and Y meets the condition that X is smaller than Y, y is greater than or equal to 5Z. According to the adhesive diaphragm and the preparation method thereof disclosed by the invention, the diaphragm not only meets the requirement on the adhesive force after the diaphragm and a pole piece are hot-pressed, but also solves the problem that the thermal shrinkage performance of a diaphragm coated by mixing ceramic and adhesive polymer particles is suddenly reduced compared with that of a full-ceramic coated diaphragm, and the diaphragm omits the step of gluing, so that the production cost is effectively saved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an adhesive separator and a preparation method thereof. Background technique [0002] Existing battery separators are generally coated with ceramic coatings, but the ceramic-coated separators and pole pieces are basically non-adhesive. During the charging and discharging of the battery, the positive and negative electrodes will repeatedly shrink and expand, resulting in battery separators and pole pieces. separation, causing problems such as battery performance and stability. [0003] In view of the defects of traditional separators, researchers applied glue on the ceramic coating layer to make the separator and the pole piece have a certain adhesion, thereby improving the stability of the battery, but the process is complicated and the production cost is high. At the same time, organic-inorganic (ceramic) hybrid-coated composite separators have been developed, but the...

Claims

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Application Information

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IPC IPC(8): H01M50/446H01M50/449H01M50/434H01M50/403C09D1/00C09D7/65
CPCH01M50/446H01M50/449H01M50/434H01M50/403C09D1/00C09D7/65Y02P70/50
Inventor 韦性强王晓明张磊陈伦孙东岳徐强杨浩田李正林
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD