Preparation process of high-performance coating diaphragm having surface coated with organic layer

A technology of surface coating and preparation process, which is applied in the direction of separators/films/diaphragms/spacers, electrical components, electrochemical generators, etc., which can solve the problems of poor uniformity of holes, serious blocking of substrates, and uneven thickness of batteries. First-class problems, to achieve the effect of thin coating thickness, improved polarization, and uniform coating thickness

Pending Publication Date: 2019-08-20
扬州中锂新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, the production process of full coating, spot coating or spray coating is generally used in the market. The principle is to use water as the solvent, and use the polymer resin particles to adhere to the surface of the substrate by adding a binder to the solution and then dry it. Therefore, the products produced by this type of process will either seriously block the pores of the substrate, such as the full coating process, resulting in high internal resistance and low capacity of the cell; or have large thickness tolerances and poor hole uniformity, such as spot coating and spraying processes The thickness of the battery cell is different, and the cycle performance is poor; in addition, in terms of adhesion with the battery cell pole piece, no good effect can be achieved.

Method used

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  • Preparation process of high-performance coating diaphragm having surface coated with organic layer
  • Preparation process of high-performance coating diaphragm having surface coated with organic layer
  • Preparation process of high-performance coating diaphragm having surface coated with organic layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 4.2kg of polyvinylidene fluoride, 1.8kg of additives, and 194kg of acetone.

[0029] Mix acetone and additives into the mixing tank, stir for 10 minutes, add polyvinylidene fluoride gradually, heat and continue to stir until the polyvinylidene fluoride is completely dissolved, the temperature of the glue solution is controlled at 40-50°C during the stirring process, and the speed is 40r / min , the stirring time is greater than 90min, and the oil-based slurry-polymer solution is obtained.

[0030] The above-mentioned slurry is coated on both sides of the diaphragm substrate—polyethylene-based film by dip coating.

[0031] The specific method is: immerse the polyethylene-based membrane with a thickness of 12 μm, a porosity of about 40%, and an average pore diameter of 0.03 μm in the prepared slurry. The film is lifted away from the slurry, and the excess slurry is dropped back into the glue tank naturally or forcibly, and after being dried by hot air at a temperatur...

Embodiment 2

[0034] Weigh 4.2kg of polyvinylidene fluoride, 1.8kg of additives, and 194kg of acetone.

[0035] Mix acetone and additives into the mixing tank, stir for 10 minutes, add polyvinylidene fluoride gradually, heat and continue to stir until the polyvinylidene fluoride is completely dissolved, the temperature of the glue solution is controlled at 40-50°C during the stirring process, and the speed is 40r / min , the stirring time is greater than 90min, and the oil-based slurry-polymer solution is obtained.

[0036] The above slurry is coated on both sides of the polyethylene-based film by gravure coating,

[0037] The specific method is: pump the prepared slurry to the gravure roller, and then pass the gravure roller rotating at a speed of 10m / min to make the slurry with a thickness of 12μm, a porosity of about 40%, and an average pore diameter of 0.03 μm polyethylene-based film, the slurry can be coated on the surface of the polyethylene-based film, and then dried by hot air at a t...

Embodiment 3

[0039] Weigh 5.7kg of polyvinylidene fluoride, 2.3kg of additives, and 192kg of acetone.

[0040] Mix acetone and additives into the mixing tank, stir for 10 minutes, add polyvinylidene fluoride gradually, heat and continue to stir until the polyvinylidene fluoride is completely dissolved, the temperature of the glue solution is controlled at 40-50°C during the stirring process, and the speed is 40r / min , the stirring time is greater than 90min, and the oil-based slurry-polymer solution is obtained.

[0041] The above slurry is coated on both sides of the polyethylene single-sided ceramic base film by dip coating.

[0042] The specific method is: immerse the polyethylene single-sided ceramic base film in the prepared slurry. After all parts are covered with the slurry, lift the base film away from the slurry, and drop the excess slurry naturally or forcibly. Fall back into the glue tank, and get a PVDF-coated composite diaphragm after drying.

[0043] The above coating speed...

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Abstract

The invention discloses a preparation process of a high-performance coating diaphragm having a surface coated with an organic layer, and relates to the technical field of production of lithium ion battery microporous membranes. The process comprises the steps of: dissolving organic viscous high-temperature resin and an additive in an organic solvent to form a polymer solution; then coating the surface of a diaphragm substrate with a polymer solution in a dip-coating or gravure-coating mode; and finally, performing drying in an oven at a temperature of 50-120 DEG C. According to the high-performance coating diaphragm prepared by employing the method, the surface of the substrate is coated with a layer of viscous high-temperature resin so that the problem of bonding of a microporous membraneand a pole piece is solved, and meanwhile, the falling of stepless particles can be well avoided, and therefore, the safety of a lithium battery is solved, and the performance of the lithium batteryis fully played.

Description

technical field [0001] The invention relates to the technical field of production of lithium-ion battery microporous membranes. Background technique [0002] At present, the lithium-ion battery microporous membranes that have been commercialized in large quantities on the market are generally polyolefin membranes or their coated membranes, such as: polypropylene film (PP), polyethylene film (PE), polyethylene / polypropylene / Polyethylene composite film (PE / PP / PE), polypropylene ceramic coated film, polyethylene ceramic coated film, polypropylene aramid coated film, polyethylene aramid coated film and non-woven film, polyimide Amine film etc. With the continuous development of the global new energy industry, new energy vehicles are becoming more and more popular, but at the same time, as the key and core component of new energy vehicles, lithium-ion batteries have higher and higher requirements, such as: High safety, long life, low weight, low cost, etc. [0003] In order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M10/42H01M10/0525
CPCH01M10/0525H01M10/4235H01M50/403H01M50/411H01M50/4295H01M50/44H01M50/449H01M50/463Y02E60/10
Inventor 李刚崔元海尚风森
Owner 扬州中锂新能源有限公司
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