Polyvinyl alcohol graft copolymer and application thereof

A technology of graft copolymer and polyvinyl alcohol, which is applied in the direction of graft polymer adhesives, adhesive types, electrical components, etc., can solve the problems of easy brittleness of PAA, easy moisture absorption of PAA, and volume expansion of silicon-based negative electrode materials Shrinkage and other problems, to achieve the effect of not easy to crack, improve easy moisture absorption, and enhance adhesion

Active Publication Date: 2021-05-07
ETERNAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PAA has the problem of easy moisture absorption, so it must be baked at a higher temperature and for a longer time when making electrode sheets; in addition, PAA usually needs to be used together with CMC and / or SBR to avoid the brittleness of pure PAA cracked problem
[0008] Nowadays, in response to the birth of high-capacity silicon-based negative electrode materials, a suitable binder is still to be developed, which can overcome the problem of volume expansion and contraction of silicon-based negative electrode materials, and can avoid the shortcomings of the above-mentioned conventional binders

Method used

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

Examples

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Embodiment approach

[0033] According to a preferred embodiment of the present invention, the fluorine-containing ethylenically unsaturated monomer (component (a)) has the chemical formula of formula (1):

[0034]

[0035] where 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:

[0036] R 1 for H, C 1 -C 4 Alkyl, or C substituted by one or more fluorine atoms 1 -C 4 alkyl; and

[0037] 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.

[0038] 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.

[0039] According to some embodiments of the present invention, R 2 Preferably H, C 1 -C 8 Alkyl, C substituted...

preparation example 1 to 10

[0084] Preparation Examples 1 to 10: Polyvinyl alcohol (hereinafter referred to as "PVA") GOHSENOL GL-05 (Nippon Synthetic Chemicals) was dissolved in 3000 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), 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 to prepare polyvinyl alcohol graft copolymer (hereinafter referred to as "graft PVA"), and then add 5 % lithium hydroxide aqueous solution to adjust the pH to between 4 and 7 to obtain the aqueous binders of Preparation Examples 1 to 10 (solid content: 5.2 wt%). The amount of reactant used for each grafted PVA is recorded in T...

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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 and (b) an olefinic unsaturated carboxylic acid 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. An electrode plate prepared from the polyvinyl alcohol graft copolymer has the beneficial properties of good adhesive force, low water absorption and the like, and is not easy to crack.

Description

【Technical field】 [0001] The invention relates to a polyvinyl alcohol graft copolymer and its application, in particular to a polyvinyl alcohol graft copolymer suitable as a water-based binder in an electrochemical device. 【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] A lithium-ion battery is mainly composed of a positive electrode, a negative electrode, an electrolyte, and a separator. Lithium ions move in and out of the positive and negative electrodes to store or release electrical energy. When charging, lithium ions move out of the positive electrode and move into the negative electrode; when discharging, lithium ions move out of the negative electrode and move into the positive electrode. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F261/04C08F220/24C08F220/06C08F220/18C09J151/00H01M4/62H01M10/0525
CPCC08F261/04C09J151/003H01M4/622H01M10/0525C08F220/24C08F220/06C08F220/1806Y02E60/10
Inventor 陈韦志陈文亿吴督宜
Owner ETERNAL MATERIALS CO LTD
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