Preparation method of modified vinylidene fluoride polymer powder

A technology of vinylidene fluoride and polymer, which is applied in the field of preparation of modified vinylidene fluoride polymer powder, and can solve problems such as poor adhesion, powder dropping, and poor binding force of binders

Active Publication Date: 2019-11-15
NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the current polymer materials are hydrophobic materials, the binding force with the binder is poor, resulting in the poor adhesion of the coating in the composite diaphragm prepared by the traditional water-based coating process to the polyolefin diaphragm, which is prone to powder drop phenomenon, which affects the normal progress of the subsequent slitting and cell winding processes, and also affects the consistency of the separator

Method used

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  • Preparation method of modified vinylidene fluoride polymer powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) Preparation of modified PVDF powder precursor

[0079] ① Mix 20 parts of PVDF powder, 0.2 part of acrylic acid, 0.4 part of methacrylic acid, 0.1 part of hydroxyethyl methacrylate, 0.1 part of sodium bisulfite and 80 parts of DI water, stir at room temperature for 0.5 h to obtain mixture A.

[0080] ②Under a nitrogen atmosphere, mix 0.02 parts of acrylamide and 20 parts of DI water in a reactor, stir at 30°C until dissolved, then add the above 80 parts of the premixed emulsion, mix well and heat up to 80°C to obtain mixture B.

[0081] ③ Sodium persulfate was dissolved in DI water to prepare a sodium persulfate solution with a concentration of about 10 wt%.

[0082] ④ Slowly add the above 5 parts of sodium persulfate solution to 100 parts of mixture B, add dropwise while stirring at 70°C and 1000rpm, react for 3 hours, filter, wash, dry and pulverize to obtain the modified PVDF powder precursor, particle size 3μm

[0083] (2) Preparation of modified PVDF powder

...

Embodiment 2

[0089] (1) Preparation of modified PVDF powder precursor

[0090] ①② Same as embodiment 1

[0091] ③ dissolving ammonium persulfate in DI water to prepare an ammonium persulfate solution with a concentration of about 8 wt%.

[0092] ④ Slowly add 10 parts of ammonium persulfate solution above to 100 parts of mixture B, add dropwise while stirring at 80°C and 1000 rpm, react for 3 hours, filter, wash, dry, and pulverize to obtain a modified PVDF powder precursor with a particle size of 3μm

[0093] (2) Preparation of modified PVDF powder

[0094] Disperse 20 parts of the modified PVDF powder precursor in 90 parts of tea polyphenol aqueous solution, the concentration of tea polyphenols is about 3wt%, pH = 8, stir and react at 45°C and 800rpm for 4h, filter, wash, dry and pulverize , to obtain modified PVDF powder with a particle size of 5 μm

[0095] (3) Preparation of composite diaphragm

[0096] ① Mix 30 parts of modified PVDF powder, 8 parts of styrene-butadiene rubber em...

Embodiment 3

[0099] (1) Preparation of modified PVDF-HFP powder precursor

[0100] ① Mix 20 parts of PVDF-HFP powder, 0.2 part of acrylic acid, 0.4 part of methacrylic acid, 0.1 part of hydroxyethyl methacrylate, 0.1 part of sodium bisulfite and 80 parts of DI water, stir at room temperature for 0.5 h to obtain mixture A;

[0101] ②Under a nitrogen atmosphere, mix 0.02 parts of acrylamide and 20 parts of DI water in a reactor, stir at 30°C until dissolved, then add 80 parts of the above-mentioned mixture A, mix well and heat up to 80°C to obtain mixture B.

[0102] ③ Dissolve potassium persulfate in DI water to prepare a 10% potassium persulfate solution.

[0103] ④ Slowly add 10 parts of potassium persulfate solution above to 100 parts of mixture B, add dropwise while stirring at 80°C and 1000 rpm, react for 3 hours, filter, wash, dry, and pulverize to obtain the modified PVDF powder precursor, particle size 4μm

[0104] (2) Preparation of modified PVDF-HFP powder

[0105] Disperse 30 ...

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Abstract

The invention relates to a preparation method of modified vinylidene fluoride polymer powder. The method includes: polymerizing (meth)acrylic acid, hydroxyalkyl (meth)acrylate and (meth)acrylamide onthe surface of a vinylidene fluoride polymer, separating the product, and conducting washing, drying and crushing to obtain modified vinylidene fluoride polymer precursor powder; reacting the modifiedvinylidene fluoride polymer precursor powder with a phenolic substance in water, separating the product, and conducting washing, drying and crushing to obtain the modified vinylidene fluoride polymerpowder. The modified vinylidene fluoride polymer powder has improved hydrophilicity and solvent resistance, improves the adhesion between vinylidene fluoride polymer powder and a base film, improvesthe powder dropping phenomenon, reduces the cost loss, improves the cohesiveness between a polymer layer and a pole piece, also reduces the loss of lithium batteries during cycling, and improves the battery rate performance.

Description

technical field [0001] The invention belongs to the field of diaphragm technology, and relates to a method for preparing modified vinylidene fluoride polymer powder. The modified vinylidene fluoride polymer powder prepared by the method is used to prepare composite The application of the diaphragm, the composite diaphragm containing the modified vinylidene fluoride polymer powder, the method for preparing the composite diaphragm by using the modified vinylidene fluoride polymer powder and the lithium battery including the composite diaphragm. Background technique [0002] In recent years, with the large screen of electronic products and the rapid development of new energy vehicles, there have been higher and higher requirements for lithium-ion batteries that provide power supply. [0003] In current lithium-ion batteries, polyolefins are commonly used as separators. In addition, in order to improve the thermal stability, oxidation resistance, heat shrinkage resistance, liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F259/08C08F220/06C08F8/00H01M2/14H01M2/16H01M10/052
CPCC08F8/00C08F259/08H01M10/052H01M50/403H01M50/411H01M50/449C08F220/06Y02E60/10
Inventor 周素霞王晓明杨浩田黄云王婷
Owner NINGDE ZHUOGAO NEW MATERIAL TECH CO LTD
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