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Thermal self-closing ceramic modified diaphragm and preparation method thereof

A self-closing and modified technology, applied to electrical components, electrochemical generators, circuits, etc., can solve problems such as powder dropping, affecting the performance of ceramic diaphragms, and poor uniformity of ceramic powder coating

Pending Publication Date: 2020-10-23
联景(厦门)信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface energy of ceramic powder, it is easy to agglomerate, and the surface is generally hydrophilic, while the polyolefin film is a hydrophobic material. According to research reports, the uniformity of ceramic powder coating is poor, and there are obvious gaps. "Powder falling" phenomenon, which will greatly affect the performance of ceramic separators in lithium-ion batteries

Method used

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  • Thermal self-closing ceramic modified diaphragm and preparation method thereof
  • Thermal self-closing ceramic modified diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the self-closing ceramic modified diaphragm provided in this embodiment includes the following steps:

[0034] S1: Prepare thermal self-closing ceramic coating 3. Specifically, first prepare the ceramic particle premix, add 0.995kg of tetraethyl orthosilicate, 0.4975kg of nano-alumina and 0.4975kg of nano-titanium dioxide, and add 0.01kg of titanium The ester coupling agent is dispersed at a high speed with a stirrer at a speed of 130 rpm, and the dispersed ceramic particle premix is ​​stirred for 25 minutes and then left to defoam. Then respectively add 0.2kg novolak epoxy acrylic resin, 0.003kg ultrafine sodium bicarbonate, 0.5kg acrylic resin, 7.297kg acrylic resin emulsion and stir to form thermal self-closing ceramic coating 3 total 10kg.

[0035] S2: The polyolefin separator substrate 1 is unwound.

[0036] S3: Corona treatment is performed on the coated surface of the polyolefin separator substrate 1 to form a corona-treated surface 2, an...

Embodiment 2

[0040] The preparation method of the self-closing ceramic modified diaphragm provided in this embodiment includes the following steps:

[0041] S1: Preparation of thermal self-closing ceramic coating 3. Specifically, first prepare a premixture of ceramic particles, add 1.14425kg of tetraethyl orthosilicate, 0.572125kg of nano-alumina and 0.572125kg of nano-titanium dioxide, and add 0.0115kg of titanium The ester coupling agent is dispersed at a high speed with a stirrer at a speed of 135 rpm, and the dispersed ceramic particle premix is ​​stirred for 30 minutes and then left to defoam. Then respectively add 0.3kg novolac epoxy acrylic resin, 0.001kg ultrafine sodium bicarbonate, 0.2kg acrylic resin, 7.199kg polyurethane emulsion and stir to form thermal self-closing ceramic coating 3 total 10kg.

[0042] S2: The polyolefin separator substrate 1 is unwound.

[0043] S3: Corona treatment is performed on the coated surface of the polyolefin separator substrate 1 to form a corona...

Embodiment 3

[0047] The preparation method of the self-closing ceramic modified diaphragm provided in this embodiment includes the following steps:

[0048] S1: Preparation of thermal self-closing ceramic coating 3. Specifically, first prepare a premixture of ceramic particles, add 0.74625kg of tetraethyl orthosilicate, 0.373125kg of nano-alumina and 0.373125kg of nano-titanium dioxide, and add 0.0075kg of titanium The ester coupling agent is dispersed at a high speed with a stirrer at a speed of 125 rpm, and the dispersed ceramic particle premix is ​​stirred for 20 minutes and then left to defoam. Then add 0.1kg of epoxy acrylic resin, 0.002kg of ultra-fine sodium bicarbonate, 0.3kg of acrylic resin, and 8.098kg of acrylic resin emulsion and stir to form a total of 10kg of thermal self-closing ceramic coating 3.

[0049] S2: The polyolefin separator substrate 1 is unwound.

[0050] S3: Corona treatment is performed on the coated surface of the polyolefin separator substrate 1 to form a c...

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Abstract

The invention discloses a thermal self-closing ceramic modified diaphragm and a preparation method thereof, and belongs to the technical field of lithium battery diaphragms, the thermal self-closing ceramic modified diaphragm comprises a polyolefin diaphragm substrate, at least one surface of the polyolefin diaphragm substrate forms a corona treatment surface, and the corona treatment surface is coated with a thermal self-closing ceramic coating. The invention discloses a preparation method of a thermal self-closing ceramic modified diaphragm. The method comprises the following steps: S1, preparing a thermal self-closing ceramic coating, S2, unwinding the polyolefin diaphragm base material; S3, carrying out corona treatment on the coated surface of the polyolefin diaphragm base material; after corona treatment is finished, coating the thermal self-closing ceramic coating prepared in the step S1; and S4, drying and shaping the coated polyolefin diaphragm base material; and S5, after drying is completed, conducting rolling, conducting standing and curing for 6-8 days at the normal temperature, and obtaining the thermal self-closing ceramic modified diaphragm. The thermal self-closingceramic modified diaphragm and the preparation method thereof have the advantages that the thermal self-closing performance is achieved, the safety is improved, the thermal curing performance is achieved, and the diaphragm breaking temperature is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a thermally self-closing ceramic modified diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion battery is an energy storage system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness. It has good economic and social benefits and strategic significance. It has been widely used in mobile communications, Digital products and other fields, and has also become one of the most important power supply systems in the field of energy storage and electric vehicles. [0003] The ceramic diaphragm is mainly used to isolate the positive and negative electrodes of high-power lithium-ion batteries. It can not only isolate the contact between the positive and negative electrodes of the battery, but also not hinder the electrolyte in the battery from passing thro...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525Y02E60/10
Inventor 吴仕伟刘清新林晓鹏吴炳生
Owner 联景(厦门)信息技术有限公司
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