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Adhesive for battery diaphragm coatings and preparation method for adhesive

A technology for battery separators and adhesives, applied in coatings, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problem of poor wettability of ceramic separators, easy falling off of ceramic powder, and weak bonding ability To achieve the effect of improving liquid absorption/retaining ability, improving lyophilicity, and inhibiting shedding

Active Publication Date: 2018-09-28
东莞市魔方新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a highly hydrophilic, high-viscosity adhesive for the problems of poor wettability of the ceramic diaphragm and easy falling off of the ceramic powder caused by the poor hydrophilicity and weak bonding ability of the existing battery ceramic diaphragm adhesive. Adhesive for battery separator coating with good adhesion and high electrochemical stability and preparation process thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add benzophenone, polyvinylidene fluoride, and polyacrylic acid to N,N-dimethylformamide (DMF) solvent in a weight ratio of 0.5:80:100, and keep stirring for 4 hours to make a solid content of 10%. the mixed solution; put the prepared mixed solution into the ultraviolet light reactor, the light distance is 40cm, and irradiate in the nitrogen protective atmosphere for 30min to obtain the fluorine-containing polyolefin / hydrophilic macromolecule graft polymer solution; and then spray drying to obtain an adhesive for battery separator coating.

[0021] Add adhesive powder, aluminum oxide nanoparticles, and carboxymethyl cellulose to the aqueous solution at a weight ratio of 5:1:90 to make a mixed solution with a solid content of 50%, and mix it at 20,000 rpm for 1 hour. A slurry for coating was obtained. Apply the slurry to the surface of the polypropylene separator by scraping, and dry at 70°C to obtain a 5 μm thick lithium battery ceramic separator coating, which is full...

Embodiment 2

[0023] Diphenyl ethyl ketone, polyvinylidene fluoride, and polyacrylonitrile were added to the N,N-dimethylacetamide (DMAC) solvent in a weight ratio of 0.4:70:100, and the stirring was continued for 5 hours to obtain a solid content of 15% mixed solution; put the prepared mixed solution into an ultraviolet light reactor, the light distance is 20cm, and irradiate in an argon protective atmosphere for 20min to prepare a fluorine-containing polyolefin / hydrophilic macromolecular graft polymer solution; After spraying and drying, an adhesive for battery diaphragm coating is prepared.

[0024] Add adhesive powder, aluminum oxide nanoparticles, and hydroxypropyl methylcellulose to the aqueous solution at a weight ratio of 5:2:90 to make a mixed solution with a solid content of 45%, and mix at 15,000 rpm 1h, the slurry for coating is obtained. Apply the slurry to the surface of the polypropylene separator by scraping, and dry at 60°C to obtain a 5 μm thick lithium battery ceramic se...

Embodiment 3

[0026] Add benzophenone, polyvinylidene fluoride-hexafluoropropylene copolymer, and polyacrylonitrile into 1-methyl-2-pyrrolidone (NMP) solvent in a weight ratio of 0.3:50:90, and keep stirring for 4 hours to prepare A mixed solution with a solid content of 17% was formed; the prepared mixed solution was placed in an ultraviolet light reactor, the light distance was 30 cm, and irradiated in a helium protective atmosphere for 20 minutes to obtain a fluorine-containing polyolefin / hydrophilic polymer graft polymer solution; and then spray drying to obtain an adhesive for battery diaphragm coating.

[0027] Adhesive powder, titanium dioxide nanoparticles, and hydroxypropyl methylcellulose were added to the aqueous solution at a weight ratio of 6:2:90 to prepare a mixed solution with a solid content of 45%, and mixed for 2 hours at 20,000 rpm to obtain Slurry for coating. Apply the slurry to the surface of the polypropylene separator by scraping, and dry at 80°C to obtain a 5 μm t...

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PUM

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Abstract

The invention relates to an adhesive for battery diaphragm coatings and a preparation method for the adhesive. The adhesive comprises a fluorinated polyolefin / hydrophilic macromolecular dendritic graft polymer. The preparation method comprises the step of grafting a hydrophilic macromolecular polymer to fluorinated polyolefin by using a photosensitizer under the action of ultraviolet rays, so as to form the dendritic polymer with a large number of hydrophilic groups. The adhesive is applied to ceramic diaphragms of lithium batteries and can be used for effectively inhibiting the spalling of ceramic powder and effectively improving the liquid absorbing and retaining capability of diaphragms; and after the diaphragms are assembled into the batteries, the batteries have the advantages of superior cycle performance, high ionic conductivity, excellent multiplying power performance and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an adhesive for battery diaphragm coating and a preparation method thereof. Background technique [0002] The separator is an important component of the lithium-ion battery. The performance of the separator determines the interface structure and internal resistance of the battery, and directly affects the capacity, cycle performance and safety of the battery. The ceramic diaphragm is a new type of high-safety diaphragm material developed on the traditional polyolefin diaphragm. The main preparation method of the ceramic diaphragm is to mix inorganic powder (such as Al 2 o 3 , SiO 2 、TiO 2 etc.), adhesives, etc. are dispersed in a solvent, and then a ceramic coating is formed on the surface of the polyolefin separator substrate by a casting method or a dipping method. The thermal shrinkage performance of the ceramic diaphragm, the liquid absorption ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C09D101/28C09D7/65C09D7/61C08J7/04C08J7/12H01M2/16C08L23/12H01M50/409
CPCC09D7/65C09D7/67C09D101/286C08G81/021C08J7/12C09D7/61C08J2323/12C08K2201/011C08K2003/2227C08J2487/00C08J2401/28C08J7/0427H01M50/409C08L87/005C08K3/22Y02E60/10
Inventor 汪圣龙蒋中林
Owner 东莞市魔方新能源科技有限公司
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