Coating slurry, coating diaphragm and preparation method thereof

A technology of coating slurry and diaphragm, which is applied in the field of coating diaphragm and its preparation, and coating slurry, which can solve the problems of insufficient adhesion and PVDF coating adhesion difficult to meet customer requirements, so as to reduce surface tension , Increase adhesion, good quality effect

Inactive Publication Date: 2018-11-20
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesion of pure PVDF coatings is sometimes difficult to meet customer requirements, that is, insufficient adhesion

Method used

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  • Coating slurry, coating diaphragm and preparation method thereof
  • Coating slurry, coating diaphragm and preparation method thereof
  • Coating slurry, coating diaphragm and preparation method thereof

Examples

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preparation example Construction

[0026] A method for preparing a coated diaphragm as described above includes: coating the coating slurry on the surface of the base film to form an aqueous coating, and then drying at a temperature of 30-80°C. Among them, the coating method includes roll coating or dip coating.

[0027] Since the coated diaphragm of this embodiment is formed by the coating slurry on the surface of the base film, the preparation process is simple, the production efficiency is high, and it is suitable for large-scale industrial production.

Embodiment 1

[0030] (1) Add 3 kg of polyvinylidene fluoride and 1 kg of ethylene bis-stearamide to 18 kg of deionized water, mix and stir for 2 hours to make them uniformly dispersed, and then add 12 kg of polymethyl methacrylate solution and stir for 0.5 hours. Finally, add 1kg of polyvinyl alcohol, 0.5kg of mineral oil, 2kg of polyacrylate and stir evenly to obtain the water-based PMMA / PVDF coating slurry;

[0031] (2) Coating the above-mentioned aqueous PMMA / PVDF coating slurry on one surface of the polyolefin base film to form a 1-2um aqueous coating, and then baking and drying in an oven at 50° C. for 5 minutes to obtain a coated diaphragm.

Embodiment 2

[0033] (1) Add 3 kg of polyvinylidene fluoride and 1 kg of liquid paraffin to 18 kg of deionized water, mix and stir for 1 h to make them uniformly dispersed, and then add 12 kg of polymethyl methacrylate solution and stir for 0.5 h. Finally, add 1kg of polyvinylpyrrolidone, 0.5kg of natural oil and 2kg of epoxy resin and stir evenly to obtain the water-based PMMA / PVDF coating slurry;

[0034] (2) Coating the above aqueous PMMA / PVDF coating slurry on both sides of the polyolefin base film to form a 1-2um aqueous coating, and then baking and drying in an oven at 80° C. for 1 min to obtain a coated diaphragm.

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Abstract

The invention provides coating slurry, a coating diaphragm and a preparation method thereof, and relates to the technical field of a battery diaphragm. The coating slurry is formed on a base membraneto obtain the coating diaphragm. The coating diaphragm comprises the following components in parts by weight: 2.5 to 3.2 parts of polyvinylidene fluoride, 11 to 13 parts of polymethyl methacrylate, 0.7 to 1.2 parts of dispersing agent, 0.8 to 1.2 parts of thickening agent, 0.3 to 0.6 part of defoaming agent, 1.8 to 2.3 parts of adhesive and 17 to 20 parts of water. The coating diaphragm has good adhesion effect.

Description

Technical field [0001] The present invention relates to the technical field of battery separators, and in particular to a coating slurry, a coating separator and a preparation method thereof. Background technique [0002] In the structure of lithium batteries, the diaphragm is one of the key internal components. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A diaphragm with excellent performance plays an important role in improving the overall performance of the battery. The main function of the separator is to separate the positive and negative electrodes of the battery to prevent the two poles from contacting and short-circuit, and also has the function of allowing electrolyte ions to pass through. [0003] Among them, the PVDF-coated separator in the structure of the lithium battery mainly uses the gel electrolyte function and the funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D133/12C09D7/63C09D7/65H01M2/14H01M2/16H01M10/0525
CPCC08J2323/00C08J2427/16C08J2433/12C08L2205/035C09D133/12C09D7/63C09D7/65C08J7/0427H01M10/0525H01M50/403H01M50/411C08L27/16C08L29/04C08L91/00C08L33/04C08K5/20C08L39/06C08L63/00C08L91/06C08L71/02C08L67/08Y02E60/10
Inventor 徐锋贾亚峰袁海朝苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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