Water-based polyvinylidene fluoride coating slurry, battery diaphragm and preparation method of slurry

A polyvinylidene fluoride, coating technology, used in polyurea/polyurethane coatings, battery pack parts, coatings, etc., can solve the problem of poor comprehensive performance, low bonding performance, and inability to effectively bond negative pole pieces, etc. problem, to achieve the effect of high bond strength, high bond strength and good battery cycle performance

Active Publication Date: 2020-05-29
武汉中兴创新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the water-based PVDF coating slurry can solve the problem of oily PVDF, and has the characteristics of low air permeability incr

Method used

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  • Water-based polyvinylidene fluoride coating slurry, battery diaphragm and preparation method of slurry
  • Water-based polyvinylidene fluoride coating slurry, battery diaphragm and preparation method of slurry
  • Water-based polyvinylidene fluoride coating slurry, battery diaphragm and preparation method of slurry

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] Example 1

[0043] The water-based polyvinylidene fluoride coating slurry of this example uses polyvinylidene fluoride particles with a particle size of 2.5 μm to be dispersed in deionized water, and a water-soluble polyacrylic resin binder with a molecular weight of 200,000 is added. Using 90,000 polyacrylic resin adhesion promoter, carboxymethyl cellulose thickener, and propylene glycol wetting agent, the aqueous polyvinylidene fluoride coating slurry of this example was prepared. Among them, the viscosity of the binder is 70 mPa·s, the pH is 7, the solid content is 40%, and the particle size is 350 nm; the particle size of the adhesion promoter is 180 nm. The specific preparation method of the aqueous polyvinylidene fluoride coating slurry of this example is as follows:

[0044] 1) Use 0.12g thickener to mix 11.88g deionized water, use a blender to stir at 120r / min for 1h, and stir until the liquid is clear and transparent and slightly yellowish liquid. If the liquid has...

Example Embodiment

[0056] Example 2

[0057] This example uses an emulsion polyacrylic resin binder with a molecular weight of 200,000 to replace the binder in Example 1. The viscosity of the binder is 120mPa·s, the pH is 8, the solid content is 42%, and the particle size is 500nm; other components, dosages and preparation methods are the same as in Example 1.

[0058] Using the same filter as in Example 1 to filter, the aqueous polyvinylidene fluoride coating slurry of this example is obtained.

[0059] Using the same base film and coating amount as in Example 1, a polyvinylidene fluoride coated diaphragm with a coating thickness of 2 μm and a total thickness of 18 μm was prepared.

[0060] The coating of the polyvinylidene fluoride coated diaphragm prepared in this example was observed by scanning electron microscope, and the results are as follows figure 2 Shown. figure 2 The results show that the polyvinylidene fluoride-coated separator of this example has a uniform coating, which is in line with ...

Example Embodiment

[0063] Example 3

[0064] This example uses different adhesion promoters on the basis of Example 1, and the details are as follows:

[0065] Test 1: A polyurethane with a molecular weight of 100,000 was used to replace the polyacrylic resin of Example 1 as an adhesion promoter; the particle size of the adhesion promoter was 230 nm.

[0066] Experiment 2: Using polyvinyl alcohol with a molecular weight of 60,000, replacing the polyacrylic resin of Example 1 as an adhesion promoter; the particle size of the adhesion promoter is 120 nm.

[0067] The rest are the same as in Example 1.

[0068] Filter with the same filter as in Example 1. The slurry using the adhesion promoter in Test 1 is labeled as water-based polyvinylidene fluoride coating slurry 1, and the slurry using the adhesion promoter in Test 2 is labeled as water-based polyvinylidene fluoride coating Slurry 2.

[0069] Using the same base film and coating amount as in Example 1, the water-based polyvinylidene fluoride coating slu...

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Abstract

The invention discloses a water-based polyvinylidene fluoride coating slurry, a battery diaphragm and a preparation method of the slurry. According to the water-based polyvinylidene fluoride coating slurry, an organic polymer with the molecular weight being larger than or equal to 200,000 is adopted as a binder, and an organic polymer with the molecular weight being not larger than 100,000 is adopted as an adhesion promoter. The high-molecular-weight organic polymer binder and the low-molecular-weight organic polymer adhesion promoter are combined for use, so that the bonding strength of the water-based polyvinylidene fluoride coating slurry can be improved; and moreover, the original advantages of low cost, small pollution, low air permeability increment and the like of the water-based polyvinylidene fluoride coating slurry are kept.

Description

technical field [0001] The present application relates to the field of battery diaphragms, in particular to an aqueous polyvinylidene fluoride coating slurry, a battery diaphragm and a preparation method. Background technique [0002] After commercial application, lithium-ion batteries are widely used in the field of batteries due to their good cycle performance, lifespan, energy density and other advantages, and the annual usage is still increasing significantly. [0003] With the development of lithium battery technology, a single diaphragm can no longer meet the existing use requirements; therefore, the diaphragm coating technology has developed rapidly, and a large number of coated battery diaphragms have appeared. Among them, battery separators with polyvinylidene fluoride (PVDF) coating and ceramic coating are the most representative. The main function of PVDF coating is to provide adhesion, bond the positive and negative electrodes, improve the stability of the batte...

Claims

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Application Information

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IPC IPC(8): C09D127/16C09D133/04C09D175/04C09D129/04H01M2/14H01M2/16
CPCC09D127/16C08L2203/20H01M50/403H01M50/411H01M50/449C08L33/04C08L75/04C08L29/04Y02E60/10
Inventor 倪靖刘琳刘建金姚坤周超
Owner 武汉中兴创新材料技术有限公司
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