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Heat-resistant lithium ion battery coat separator and preparation method thereof

A lithium-ion battery, heat-resistant technology, used in secondary batteries, battery pack parts, secondary battery repair/maintenance, etc. Improve heat shrinkage performance, small diaphragm shrinkage, and good coating thickness consistency

Inactive Publication Date: 2019-01-08
上海钱丰纺织品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the hardness of nano-inorganic particles is high, and there is still the possibility of piercing the diaphragm, which intensifies the wear and tear of processing equipment and increases production costs; on the other hand, nano-inorganic particles are insoluble in any solution system, which will cause uneven coating. Affect battery performance; In addition, the specific gravity of inorganic particles is relatively large, which significantly increases the weight of the separator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of heat-resistant lithium-ion battery coating diaphragm, concrete steps are as follows:

[0035] a. Dissolving water-soluble phenolic resin and polyvinylpyrrolidone in water to obtain a heat-resistant organic polymer coating liquid, wherein, in parts by weight, the content of each component in the heat-resistant organic polymer coating liquid is: water-soluble phenolic 15 parts of resin, 10 parts of polyvinylpyrrolidone, 75 parts of water;

[0036] b. Coat the heat-resistant organic polymer coating solution on both sides of the polypropylene lithium-ion battery base film. After heating and curing, clean the polyvinylpyrrolidone with water and dry to obtain the finished product. The curing temperature is 150°C and the time is 5min. During curing, a tension of 300cN is applied to both sides of the polypropylene lithium-ion battery base film. When the porogen removal rate is 99.9wt%, the washing is terminated. The drying temperature is 100°C and the ...

Embodiment 2

[0040] The preparation method of heat-resistant lithium-ion battery coating diaphragm, concrete steps are as follows:

[0041] a. Dissolving water-soluble phenolic resin and polyvinylpyrrolidone in water to obtain a heat-resistant organic polymer coating liquid, wherein, in parts by weight, the content of each component in the heat-resistant organic polymer coating liquid is: water-soluble phenolic 20 parts of resin, 20 parts of polyvinylpyrrolidone, 60 parts of water;

[0042] b. Coat the heat-resistant organic polymer coating solution on both sides of the polypropylene lithium-ion battery base film. After heating and curing, clean the polyvinylpyrrolidone with water and dry to obtain the finished product. The curing temperature is 150°C and the time is 5min. During curing, a tension of 300cN is applied to both sides of the polypropylene lithium-ion battery base film. When the porogen removal rate is 99.9wt%, the washing is terminated. The drying temperature is 100°C and the ...

Embodiment 3

[0046] The preparation method of heat-resistant lithium-ion battery coating diaphragm, concrete steps are as follows:

[0047] a. Dissolving water-soluble phenolic resin and polyvinylpyrrolidone in water to obtain a heat-resistant organic polymer coating liquid, wherein, in parts by weight, the content of each component in the heat-resistant organic polymer coating liquid is: water-soluble phenolic 5 parts of resin, 5 parts of polyvinylpyrrolidone, 90 parts of water;

[0048] b. Coat the heat-resistant organic polymer coating solution on both sides of the polypropylene lithium-ion battery base film. After heating and curing, clean the polyvinylpyrrolidone with water and dry to obtain the finished product. The curing temperature is 150°C and the time is 5min. During curing, a tension of 300cN is applied to both sides of the polypropylene lithium-ion battery base film. When the porogen removal rate is 100.0wt%, the washing is terminated. The drying temperature is 100°C and the d...

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Abstract

A method for prepare a heat-resistant lithium ion battery coating separator comprise coating a heat-resistant organic polymer coating liquid on one or both side surfaces of a polypropylene lithium ionbattery base film, solidifying, pore forming and drying to obtain a heat-resistant lithium ion battery coating separator, wherein that heat-resistant organic polymer coating liquid is coated on one or both side surfaces of the polypropylene lithium ion battery base film; Heat-resistant organic polymer coating solution is mainly composed of heat-resistant organic polymer, pore-forming agent and water. The heat-resistant organic polymer is water-soluble phenolic resin, and the pore-forming agent is polyvinyl pyrrolidone or polyvinyl alcohol. The longitudinal shrinkage of the final product is <=3. 0% at temperature T, and the transverse shrinkage does not occur, and T >= 190 DEG C. The coating has a diameter of 30-70 nm micro-pore, in 180 degrees repeatedly fold more than 100 times the coating and the base film do not peel off. The preparation method of the invention has the advantages of simple process, low cost and good thermal stability of the prepared product.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to a heat-resistant lithium-ion battery coating diaphragm and a preparation method thereof, in particular to a heat-resistant lithium-ion battery coating diaphragm with a water-soluble phenolic resin coating and a preparation method thereof. Background technique [0002] At present, a large number of commercial lithium-ion battery separators use polypropylene separators. Since the melting point of polypropylene is lower than 165°C, at higher temperatures, polypropylene will melt and become soft, and the polypropylene separator will shrink, causing short-circuit heating of the positive and negative electrodes of the lithium-ion battery, resulting in expansion, rupture and combustion of the lithium-ion battery , seriously affecting the safety of lithium-ion batteries. And, more importantly, once the current polypropylene separator is pierced, it will form a positive and negative sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/42B82Y30/00H01M50/403H01M50/414
CPCH01M10/0525H01M10/4235B82Y30/00H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 钱辉春赵炯心陈利
Owner 上海钱丰纺织品有限公司
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