Polyvinyl alcohol graft copolymer and application thereof

A technology of graft copolymer and polyvinyl alcohol, which is applied in the field of polyvinyl alcohol graft copolymer, can solve problems such as decreased adhesion, easy powder removal, and influence on battery electrochemical performance

Active Publication Date: 2021-05-07
ETERNAL MATERIALS CO LTD
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned above, in response to the development of high energy density batteries, a pretreatment technology for negative electrode materials has been developed. The material is alkaline, and the alkaline environment makes the PAA-based binder material unable to firmly bite on the surface of the metal current collector (such as copper foil, aluminum foil), and the adhesion force decreases, so the various materials in the electrode sheet cannot be firmly bonded and easy to fall off. , affecting the electrochemical performance of the resulting battery

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
  • Polyvinyl alcohol graft copolymer and application thereof
  • Polyvinyl alcohol graft copolymer and application thereof
  • Polyvinyl alcohol graft copolymer and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0043] According to a preferred embodiment of the present invention, the fluorine-containing ethylenically unsaturated monomer (component (a)) has the chemical formula of formula (1):

[0044]

[0045] Among them, R 1 and R 2 At least one of them is a group substituted by a fluorine atom, and R 1 and R 2 has the following definitions:

[0046] R 1 for H, C 1 -C 4 Alkyl, or C substituted by one or more fluorine atoms 1 -C 4 alkyl; and

[0047] R 2 for H, C 1 -C 12 Alkyl, C substituted by one or more fluorine atoms 1 -C 12 Alkyl, aryl, aryl substituted with one or more fluorine atoms, aralkyl, or aralkyl substituted with one or more fluorine atoms.

[0048] According to some embodiments of the present invention, R 1 Preferably H, C 1 -C 3 Alkyl, or C substituted by one or more fluorine atoms 1 -C 3 Alkyl, more preferably H, methyl or trifluoromethyl.

[0049] According to some embodiments of the present invention, R 2 Preferably H, C 1 -C 8 Alkyl, C sub...

preparation example 1 to 5

[0104] Preparation Examples 1 to 5: Polyvinyl alcohol (hereinafter referred to as "PVA") GOHSENOL GL-05 (Nippon Synthetic Chemicals) was dissolved in 7200 ml of water, and stirred thoroughly to obtain a uniform, transparent and viscous polyvinyl alcohol aqueous solution. The oxygen in the aqueous solution was excluded by continuing to blow nitrogen gas for about 60 minutes. Then 2,2,2-trifluoroethyl (meth)acrylate (Sigma-Aldrich; 99% purity), (meth)acrylic acid (Sigma-Aldrich; 99% purity), (meth)acrylamide (Sigma -Aldrich; purity 98%), hexyl (meth)acrylate (Sigma-Aldrich; purity 99%) and 1% sodium persulfate aqueous solution, stir and mix evenly, heat up to 70°C and continue to react for 4 hours, thereby preparing polyethylene Alcohol graft copolymer (hereinafter referred to as "graft PVA"), which is used as the water-based binder of Preparation Examples 1 to 5 (solid content is 5.2% by weight). The amount of reactant used for each grafted PVA is recorded in Table 1.

preparation example 6 and 7

[0105] Preparation Examples 6 and 7: (meth)acrylamide was replaced by N-methylolacrylamide (Merck; purity 48%) as an ethylenically unsaturated amide monomer, and the rest of the preparation steps were as in Preparation Examples 1 to 5 above. The amounts of reactants are listed in Table 1. The resulting product had a solids content of 5.2% by weight.

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
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a polyvinyl alcohol graft copolymer which comprises a polyvinyl alcohol main chain, and a branched chain of the polyvinyl alcohol graft copolymer comprises a structural unit derived from the following monomers: (a) a fluorine-containing olefinic unsaturated monomer, (b) an olefinic unsaturated carboxylic acid monomer and (c) an olefinic unsaturated amide monomer. The invention also provides a water-based adhesive composition containing the polyvinyl alcohol graft copolymer and an electrode slurry composition containing the polyvinyl alcohol graft copolymer.

Description

【Technical field】 [0001] The invention relates to a polyvinyl alcohol graft copolymer, in particular to a polyvinyl alcohol graft copolymer suitable for alkaline environment. The present invention also relates to the application of the polyvinyl alcohol graft copolymer in aqueous binder composition and electrode slurry composition. 【Background technique】 [0002] In recent years, in the field of chemical energy storage systems, lithium-ion batteries have gained widespread attention due to their relatively light weight and relatively high capacitance (ie, relatively high energy density), high operating voltage, and high cycle life etc. [0003] The electrode sheet in the lithium-ion battery is a key component and plays an important role in the performance of the battery. Specifically, it will affect the energy density, discharge capacity and cycle life of the battery. The electrode sheet is mainly composed of active materials (such as positive and negative electrodes), cond...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C08F261/04C08F220/24C08F220/06C08F220/56C08F220/58C08F220/18H01M4/62H01M10/0525
CPCC08F261/04H01M4/621H01M10/0525C08F220/24C08F220/06C08F220/56C08F220/58C08F220/1806Y02E60/10C08K3/22H01M4/623C08F220/22C08K2003/2203
Inventor 陈韦志
Owner ETERNAL MATERIALS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap