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Colored ceramic coating film coated with aramid polymer, and preparation method thereof

A ceramic coating, polymer technology, applied in the direction of separators/films/diaphragms/spacers, electrical components, circuits, etc., can solve the problems of uneven pores, poor high temperature resistance, negative impact on battery performance, etc. Achieve the effect of improving safety performance, improving cycle performance and simple preparation process

Inactive Publication Date: 2018-10-26
QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional lithium-ion battery separator in the market is a polyolefin separator, which is characterized by high mechanical strength, good chemical stability, and low production cost, but its disadvantages are poor high temperature resistance and poor wettability to electrolyte, etc. Problems, for this reason, the researchers on the polyolefin separator by way of coating in order to improve the safety and cycle performance of the separator
New products such as ceramic-coated polyolefin diaphragms and PVDF-coated polyolefin diaphragms have appeared on the market. Although ceramic-coated diaphragms have good high temperature resistance, they have poor adhesion to the substrate due to ceramic inorganic materials, resulting in powder removal. Phenomenon, as well as the uniformity of the coating layer, the safety of the battery will not be improved enough during service, and the cycle performance of the battery will also be reduced
The wettability of the electrolyte and the adhesion to the electrode of the PVDF-coated separator have been improved, but because the pore-forming conditions require high humidity, it is easy to cause uneven pores and even dense layers, which have a negative impact on the performance of the battery

Method used

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  • Colored ceramic coating film coated with aramid polymer, and preparation method thereof
  • Colored ceramic coating film coated with aramid polymer, and preparation method thereof
  • Colored ceramic coating film coated with aramid polymer, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 20g of dispersant to 345g of water, after completely dissolving, add 5g of wetting agent, then add 100g of ceramic particles and 10g of dye, stir quickly to dissolve, then add 20g of adhesive, stir until the slurry is evenly mixed, and get the concentration 20wt% ceramic slurry. Pour the prepared slurry on a polyethylene diaphragm substrate with a thickness of 12 μm, and after coating the scraping film, dry it directly in a drying oven at 70°C for 2 hours to remove the solvent to obtain a colored ceramic coated diaphragm. figure 1 SEM image of the cross-sectional morphology of the coated base film.

[0039] Mix 2g of aramid, 10g of pore-forming agent, and 88g of N,N-dimethylacetamide (DMAc), and mechanically stir in an oil bath at 80°C for 6h until a uniform and transparent casting solution is obtained. The concentration of aramid is 2wt%. . Pour the configured aramid film casting solution on the above-mentioned film, after coating the scraping film, place it in a...

Embodiment 2

[0041] Add 25g of dispersant to 310g of water, after it is completely dissolved, add 5g of wetting agent, then add 125g of ceramic particles and 10g of dye, stir quickly to dissolve, then add 25g of adhesive, stir until the slurry is evenly mixed, and get the concentration 25wt% ceramic slurry. Pour the prepared slurry on a polyethylene diaphragm substrate with a thickness of 12 μm, and after coating the scraping film, dry it directly in a drying oven at 70°C for 2 hours to remove the solvent to obtain a colored ceramic coated diaphragm.

[0042]Mix 2g of aramid, 10g of pore-forming agent, and 88g of N,N-dimethylacetamide (DMAc), and mechanically stir in an oil bath at 80°C for 6h until a uniform and transparent casting solution is obtained. The concentration of aramid is 2wt%. . Pour the configured aramid film casting solution on the above-mentioned film, after coating the scraping film, place it in a plasticizing bath to form a film by the L-S phase inversion method, then i...

Embodiment 3

[0044] Add 20g of dispersant to 345g of water, after completely dissolving, add 5g of wetting agent, then add 100g of ceramic particles and 10g of dye, stir quickly to dissolve, then add 20g of adhesive, stir until the slurry is evenly mixed, and get the concentration 20wt% ceramic slurry. Pour the prepared slurry on a polyethylene diaphragm substrate with a thickness of 12 μm, and after coating the scraping film, dry it directly in a drying oven at 70°C for 2 hours to remove the solvent to obtain a colored ceramic coated diaphragm.

[0045] Mix 4g of aramid, 10g of pore-forming agent, and 86g of N,N-dimethylacetamide (DMAc), and mechanically stir in an oil bath at 80°C for 6h until a uniform and transparent casting solution is obtained. The concentration of aramid is 4wt%. . Pour the configured aramid film casting solution on the above-mentioned film, after coating the scraping film, place it in a plasticizing bath to form a film by the L-S phase inversion method, then immer...

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Abstract

The invention provides a colored ceramic coating film coated with aramid polymer, and a preparation method thereof, and belongs to the technical field of the lithium ion battery. The diaphragm prepared through the method can solve the problems of high-temperature thermal contraction, ceramic coating layer powder removing, bad in cohesive force with pole plate, and coating uniformity detection of coating diaphragm. The lithium battery diaphragm is high in porosity, uniform in coating, good in electrolyte wettability and high-temperature resistant, and the lithium ion battery security and the electrochemical performance are improved. The colored ceramic coating film coated with aramid polymer disclosed by the invention comprises a base material polyolefin microporous film, colored ceramic coating layer at one side or two side surfaces of the polyolefin diaphragm, and aramid coating layer at one side or two side surfaces of the ceramic coating. The colored ceramic coating film coated withthe aramid polymer disclosed by the invention can be used for preparing the lithium ion battery diaphragm and the lithium ion battery containing the diaphragm.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery diaphragm materials, and in particular relates to an aramid polymer-coated colored ceramic coating film and a preparation method thereof. Background technique [0002] In recent years, the application range of lithium-ion batteries has become wider and wider, so the requirements for lithium-ion batteries have become higher and higher. The frequent occurrence of safety accidents of lithium-ion batteries has aroused widespread concern about safety issues. Once a similar accident occurs inside the battery Short circuit and other problems are likely to cause safety hazards. In lithium-ion batteries, the diaphragm is an important part of it. In addition to providing a channel for lithium-ion movement, it also plays a role in blocking the positive and negative electrodes, thereby providing protection for the safety of the battery. With the increasing emphasis on the safety of lithium batteries, The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/409Y02E60/10
Inventor 郅立鹏陈继朝公言飞李丹胡一波厉勇
Owner QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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