Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 7 Cited by
  • 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 increase, low pollution, and low price; The connection performance is low, and even the negative electrode sheet cannot be effectively bonded

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Embodiment 1

[0043] In the water-based polyvinylidene fluoride coating slurry in this example, particles with a particle size of 2.5 μm prepared by polyvinylidene fluoride are dispersed in deionized water, and a water-soluble polyacrylic acid resin binder with a molecular weight of 200,000 is added. Prepare the water-based polyvinylidene fluoride coating slurry of this example with 90,000 polyacrylic resin adhesion promoter, carboxymethyl cellulose thickener, and propylene glycol wetting agent. Wherein, the viscosity of the binder is 70 mPa·s, the pH value 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 water-based polyvinylidene fluoride coating slurry of this example is as follows:

[0044] 1) Use 0.12g of thickener to mix 11.88g of deionized water, use a mixer to stir at a speed of 120r / min for 1 hour, stir until a clear and transparent yellowish liquid, if the liquid has not re...

Embodiment 2

[0057] This example adopts the emulsion polyacrylic resin binder that molecular weight is 200,000, replaces the binder of embodiment 1; The viscosity of binder is 120mPa s, and pH value is 8, and solid content is 42%, and particle size is 500nm; All the other components, consumption and preparation method are the same as in Example 1.

[0058] The water-based polyvinylidene fluoride coating slurry of this example was obtained by filtering through the same filter screen as in Example 1.

[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 in this example was prepared.

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

Embodiment 3

[0064] This example adopts different adhesion promoters on the basis of Example 1, as follows:

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

[0066] Experiment 2: Polyvinyl alcohol with a molecular weight of 60,000 was used to replace the polyacrylic resin in Example 1 as the adhesion promoter; the particle size of the adhesion promoter was 120 nm.

[0067] All the other are identical with embodiment 1.

[0068] Using the same filter screen as in Example 1 to filter, the slurry using the adhesion promoter of test 1 is marked as water-based polyvinylidene fluoride coating slurry 1, and the slurry using the adhesion promoter of test 2 is marked as water-based polyvinylidene fluoride coating Slurry 2.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com