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Ceramic diaphragm and preparation method therefor

A technology of ceramic diaphragm and thermally conductive ceramics, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of inability to conduct and disperse heat in time, overheating of diaphragm, poor thermal conductivity, etc., to reduce the risk of short circuit and improve thermal conductivity. performance, the effect of suppressing heat shrinkage

Inactive Publication Date: 2017-07-07
东莞市赛普克电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a ceramic diaphragm with good thermal stability, high safety and good heat conduction effect in view of the deficiencies in the prior art; Dissipates heat to avoid localized overheating of the diaphragm

Method used

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  • Ceramic diaphragm and preparation method therefor
  • Ceramic diaphragm and preparation method therefor
  • Ceramic diaphragm and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] like figure 1 As shown, a ceramic diaphragm includes a base film 1, a heat-resistant ceramic coating 2 and a heat-conducting ceramic coating 3, the heat-resistant ceramic coating 2 is coated on one surface of the base film 1, and the heat-conducting ceramic coating 3 is coated on On the other surface of the base film 1, the thickness of the heat-resistant ceramic coating 2 is 4 μm, the thickness of the heat-conducting ceramic coating 3 is 6 μm; the average particle diameter of the heat-resistant ceramic particles is 0.5 μm, and the particle size distribution range is 0.01 to 4μm; the average particle size of the heat-conducting ceramic particles is 1μm, the particle size distribution range is 0.05-4μm, and the thermal conductivity of the heat-conducting ceramic particles is ≥80W / (m·K).

[0039] The preparation method of the ceramic diaphragm is as follows:

[0040] 1) Take a polypropylene microporous film with a thickness of 16 μm as the base film 1;

[0041] 2) Mix a...

Embodiment 2

[0047] like figure 2 As shown, a ceramic diaphragm includes a base film 1, a heat-resistant ceramic coating 2 and a heat-conducting ceramic coating 3, the heat-resistant ceramic coating 2 is coated on one surface of the base film 1, and the heat-conducting ceramic coating 3 is coated on On the surface of the heat-resistant ceramic coating 2, wherein the thickness of the heat-resistant ceramic coating 2 is 8 μm, and the thickness of the heat-conducting ceramic coating 3 is 10 μm; the average particle diameter of the heat-resistant ceramic particles is 3 μm, and the particle size distribution range is 0.5 to 6μm; the average particle size of the heat-conducting ceramic particles is 4μm, the particle size distribution range is 0.5-8μm, and the thermal conductivity of the heat-conducting ceramic particles is ≥100W / (m·K).

[0048] The preparation method of the ceramic diaphragm is as follows:

[0049] 1) Take a polyethylene microporous film with a thickness of 16 μm as the base fil...

Embodiment 3

[0056] like image 3 As shown, a ceramic diaphragm includes a base film 1, a heat-resistant ceramic coating 2 and a heat-conducting ceramic coating 3, the heat-resistant ceramic coating 2 is coated on both surfaces of the base film 1, and the heat-conducting ceramic coating 3 is coated respectively Covered on the surface of two heat-resistant ceramic coatings 2, wherein the thickness of a single heat-resistant ceramic coating 2 is 4 μm, and the thickness of a single heat-conducting ceramic coating 3 is 5 μm; the average particle size of heat-resistant ceramic particles is 0.2 μm , the particle size distribution range is 0.01-2μm; the average particle size of the heat-conducting ceramic particles is 0.5μm, the particle size distribution range is 0.05-3μm, and the thermal conductivity of the heat-conducting ceramic particles is ≥100W / (m·K).

[0057] The preparation method of the ceramic diaphragm is as follows:

[0058] 1) Take a polypropylene microporous film with a thickness ...

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Abstract

The invention belongs to the technical field of a diaphragm of a lithium ion battery, and particularly relates to a ceramic diaphragm and a preparation method therefor. The ceramic diaphragm comprises a base diaphragm, and a heat-resistant ceramic coating layer which is coated on at least one surface of the base diaphragm, and also comprises a heat-conducting ceramic coating layer which is coated on the surface of the heat-resistant ceramic coating layer and / or the other surface of the base diaphragm. Compared with the prior art, by additionally arranging the heat-conducting ceramic coating layer on the base diaphragm comprising the heat-resistant ceramic coating layer, the heat conducting performance of the ceramic diaphragm is effectively improved; when the battery suffers form partial overheating caused by puncturing, collision, extrusion and the like, the heat-conducting ceramic coating layer can rapidly conduct and scatter the heat on the partial place of the diaphragm to the whole ceramic diaphragm, so that partial heat shrinkage of the ceramic diaphragm can be restrained, and risk of short circuit of the battery can be further lowered.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and in particular relates to a ceramic diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products and products that need to provide power and energy storage due to their advantages such as large specific energy, high working voltage, long cycle life, and environmental friendliness. However, the safety of lithium-ion batteries has always been an important issue in the industry matter of great concern. Among them, the diaphragm used to isolate the positive and negative electrodes plays a vital role in the safety of lithium-ion batteries. At present, the commonly used separators in the industry are mainly polyolefin films such as polyethylene and polypropylene; however, the heat-resistant temperature of general polyolefin separators is about 130°C. Once short-circuit heating occurs, polyolef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/42H01M10/0525H01M50/403H01M50/434H01M50/449
CPCH01M10/0525H01M10/4235H01M50/403H01M50/431H01M50/411H01M50/449Y02E60/10
Inventor 赖旭伦
Owner 东莞市赛普克电子科技有限公司
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