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Preparation method of fluorine-containing adhesive for lithium battery ceramic diaphragm and ceramic diaphragm prepared by using the adhesive

A technology of ceramic diaphragm and lithium battery, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problems of affecting the coating speed, product leveling, affecting the microscopic morphology of ceramic diaphragm, and harmful to the environment of the adhesive. Achieve excellent water repellency, excellent processability, heat resistance and improved solvent resistance

Active Publication Date: 2020-09-25
湖南高瑞电源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binders of organic systems such as PVDF, PTFE, and FEP are harmful to the environment; water-based SBR binders are mainly suitable for lithium battery negative electrode coating; Large, when used on the lithium battery ceramic diaphragm, it will affect the coating speed and the leveling of the product. It has the advantages of low coating viscosity, good thermal stability, high bonding strength, and environmental friendliness. It is expected to become an excellent ceramic separator adhesive and be used in the field of lithium batteries. However, according to the test data provided by it, the PP separator 16+4μ coating on the surface, its thermal shrinkage rate (150°C / 1h) is about 1.5%, and its heat resistance needs to be further improved

Method used

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  • Preparation method of fluorine-containing adhesive for lithium battery ceramic diaphragm and ceramic diaphragm prepared by using the adhesive
  • Preparation method of fluorine-containing adhesive for lithium battery ceramic diaphragm and ceramic diaphragm prepared by using the adhesive

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Experimental program
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Effect test

Embodiment 1

[0030] The preparation method of the adhesive used for the lithium-ion battery ceramic diaphragm is: 18.6g of trifluoroethyl methacrylate calculated by weight percentage, 2.4g of hydroxyethyl methacrylate, 7.2g of acrylic acid, 13.5g of styrene g, emulsifier allyloxy nonylphenol propanol polyoxyethylene (4) ether ammonium sulfate 0.6g, sodium hydroxide 3.9g, ammonium persulfate 0.2g and water 140g are all added to the pre-emulsification reaction container, mechanically stirred for 3h Disperse to form a stable pre-emulsion; take 120g of the pre-emulsion and add it to the polymerization reaction vessel, heat it to the polymerization reaction temperature of 70°C under the protection of nitrogen, react for 20 minutes, then add the remaining pre-emulsion dropwise, drop it within 1 hour, and keep it warm for 3 hours , cooled to room temperature, and filtered to obtain a binder emulsion for lithium battery ceramic separators.

[0031] The prepared ceramic diaphragm adhesive emulsion ...

Embodiment 2

[0033] In this embodiment, trifluoroethyl acrylate is used as the adhesive for the ceramic diaphragm instead of trifluoroethyl methacrylate, the amount of water is increased from 140 g to 180 g, and the rest of the steps are the same as in Embodiment 1.

[0034] The prepared ceramic diaphragm adhesive emulsion is white, with a solid content of about 20%, a viscosity of less than 200 centipoise, and a copolymer particle size D50 of less than 0.5 μm. The obtained adhesive particle size distribution spectrum is as follows: figure 2 shown.

Embodiment 3

[0036] In this embodiment, the ceramic diaphragm adhesive uses hydroxyethyl acrylate instead of hydroxyethyl methacrylate, and the emulsifier allyloxy fatty alcohol oxyethylene ether ammonium sulfate replaces allyloxy nonylphenol propanol polyoxyethylene ( 4) ether ammonium sulfate, and consumption is brought up to 0.8g by 0.6g, and potassium persulfate replaces ammonium persulfate, and the consumption of water is reduced to 100g by 140g, and all the other steps are with embodiment 1.

[0037] The prepared ceramic diaphragm binder emulsion is milky white, has a solid content of about 30 percent, a viscosity of less than 600 centipoise, and a copolymer particle diameter D50 of less than 1 μm.

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Abstract

The invention discloses a preparation method of a fluorine-containing adhesive for a lithium battery ceramic diaphragm and a ceramic diaphragm prepared with the adhesive. The preparation method is as follows: add fluorine-containing acrylic acid monomer, hydroxyl monomer, organic acid monomer, vinyl monomer, reactive emulsifier, neutralizer, initiator and water into the pre-emulsification reaction kettle, and carry out mechanical stirring. Disperse to form a stable pre-emulsion; take part of the pre-emulsion and add it to the polymerization reactor, heat it to the polymerization temperature of 50-90°C under the protection of nitrogen, react for 0.1-1h, add the remaining pre-emulsion dropwise, and drop it in 0.5-4h. Insulate and react for 1 to 6 hours, cool to room temperature, filter, and obtain. The water-based adhesive emulsion of the present invention is environmentally friendly, has excellent cohesiveness, mechanical stability, heat resistance, etc., and the ceramic diaphragm prepared by using it has low water absorption rate and excellent heat resistance.

Description

technical field [0001] The invention relates to a preparation method of a water-based adhesive for a lithium battery ceramic diaphragm and a ceramic diaphragm prepared by using the adhesive, in particular to a preparation method of a fluorine-containing adhesive for a lithium battery ceramic diaphragm and a product prepared therefrom. Ceramic diaphragm. Background technique [0002] With the continuous development of society and economy, human's demand for energy continues to increase. Traditional non-renewable energy sources such as coal, oil, and natural gas are about to be exhausted, and the pollution to the environment is becoming more and more serious. Looking for new energy and development New energy tools are imminent. At present, lithium-ion batteries are more and more favored by people, especially in the fields of automobiles and high-end electronic products, for their advantages of convenient use, relatively low application cost, long service life, and no pollutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/22C08F212/08C08F220/28C08F220/06C08F2/26H01M2/16H01M50/446
CPCC08F2/26C08F220/22H01M50/446C08F212/08C08F220/281C08F220/06Y02E60/10
Inventor 席柳江张倩刘龙
Owner 湖南高瑞电源材料有限公司
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