Preparation method of lithium battery diaphragm adopting VDF polymer water-based coating liquid

A lithium battery diaphragm and water-based coating solution technology, which is applied in the direction of lithium batteries, non-aqueous electrolyte batteries, battery components, etc., can solve the problems of difficult production, high cost, and complicated equipment, and is conducive to industrialization. Promotion, The effect of low production cost and high safety

Active Publication Date: 2022-05-17
ZHEJIANG JUSHENG FLUOROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The wet method diaphragm also has disadvantages. Except for the poor thermal stability due to the limitation of the base material, most of them are non-product factors. If a large amount of solvent is required, it is easy to cause environmental pollution; compared with the dry method, the equipment is more complicated and the investment is larger. , long cycle, high cost, high energy consumption, difficult production, low production efficiency, etc.

Method used

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  • Preparation method of lithium battery diaphragm adopting VDF polymer water-based coating liquid
  • Preparation method of lithium battery diaphragm adopting VDF polymer water-based coating liquid
  • Preparation method of lithium battery diaphragm adopting VDF polymer water-based coating liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Using polyethylene film and coating VDF polymer lithium battery separator coating liquid on both surfaces of the film, the coating rate is 5m / min, and drying in a 60°C oven to obtain a lithium battery separator.

[0040] The preparation method of VDF polymer coating liquid for lithium battery separator is as follows:

[0041] (1) 100 g of polyvinylidene fluoride emulsion was added to 30 g of potassium hydroxide solution with a concentration of 20%, nitrogen was introduced, and heated and stirred at 60° C. for 5 h to obtain a polyvinylidene fluoride emulsion with carbon-carbon double bonds on the molecular chain;

[0042] (2) Add 100g of carbon-carbon double bond polyvinylidene fluoride emulsion, 10g of thiodiethylene mercaptan, 2g of vinyltributanone oximosilane, 0.02g of lithium acrylate, 0.5g of 2-hydroxy-2 into the reactor -Methyl-1-phenylacetone, mix uniformly, and age at 60° C. for 16 hours to obtain a VDF polymer lithium battery separator coating solution.

[004...

Embodiment 2

[0045] Using polypropylene film and coating VDF polymer lithium battery separator coating liquid on both sides of the film at a coating rate of 5 m / min, and drying in a 60° C. oven to obtain a lithium battery separator.

[0046] The preparation method of VDF polymer coating liquid for lithium battery separator is as follows:

[0047](1) 100 g of vinylidene fluoride-hexafluoropropylene emulsion was added to 30 g of potassium hydroxide solution with a concentration of 20%, nitrogen was introduced, and heated and stirred at 60 ° C for 5 h to obtain vinylidene fluoride- Hexafluoropropylene emulsion;

[0048] (2) Add 100g of carbon-carbon double bond vinylidene fluoride-hexafluoropropylene emulsion, 12g of ethanedithiol, 3g of vinyltributanone oximosilane, 0.03 part of lithium acrylate, 1.0g of 1-hydroxyl ring in the reactor Hexyl phenyl ketone, mixed uniformly, and aged at 65° C. for 16 h to obtain a VDF polymer lithium battery separator coating solution.

[0049] (3) When coati...

Embodiment 3

[0051] A polyethylene / polypropylene composite film was used and the VDF polymer lithium battery separator coating liquid was coated on both sides of the film at a coating rate of 5 m / min, and dried in an oven at 60°C to obtain a lithium battery separator.

[0052] The preparation method of VDF polymer coating liquid for lithium battery separator is as follows:

[0053] (1) 100 g of vinylidene fluoride-trifluoroethylene emulsion was added to 30 g of potassium hydroxide solution with a concentration of 20%, nitrogen was introduced, and heated and stirred at 60 ° C for 5 h to obtain vinylidene fluoride- trifluoroethylene emulsion;

[0054] (2) in the reactor, add the vinylidene fluoride-trifluoroethylene emulsion of 100g carbon-carbon double bond, 16g ethanedithiol, 4g vinyltributanone oximosilane, 0.04 part of lithium acrylate, 1.5g 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide, mixed uniformly, and aged at 70° C. for 12 hours to obtain a VDF polymer lithium battery separator...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a preparation method of a lithium battery diaphragm adopting VDF polymer water-based coating liquid. According to the preparation method of the lithium battery diaphragm adopting the VDF polymer water-based coating liquid, the PVDF resin emulsion is adopted as a raw material, no emulsion needs to be prepared, the production process is environmentally friendly, the safety is high, the production cost is low, and industrial popularization is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for preparing a lithium battery separator using a VDF polymer aqueous coating solution. Background technique [0002] The performance of the diaphragm product is affected by the matrix material and the manufacturing process. The stability, consistency and safety of the separator have a decisive impact on the discharge rate, energy density, cycle life and safety of lithium batteries. Compared with the dry diaphragm, the wet diaphragm has better material properties such as thickness uniformity, mechanical properties (tensile strength, puncture resistance), air permeability, physical and chemical properties (wetting, chemical stability, safety). In order to be excellent, it is beneficial to the absorption and retention of the electrolyte and improves the charge-discharge and cycle capacity of the battery, and is suitable for high-capacity batteries. From the poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/457H01M50/426H01M10/052
CPCH01M50/403H01M50/457H01M50/426H01M10/052Y02E60/10
Inventor 孟庆文余国军陈伟峰余考明王京辉黄军路迪
Owner ZHEJIANG JUSHENG FLUOROCHEM
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