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Oil-based PVDF spraying slurry, diaphragm coated with oil-based PVDF spraying slurry as well as preparation method and application of diaphragm

An oil-based and slurry technology, which is applied to coatings, electrical components, circuits, etc., can solve the problems of poor wettability of lithium-ion batteries, and achieve the effects of low air permeability, cost reduction, and small spraying area

Inactive Publication Date: 2020-10-02
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3) The wettability of the lithium-ion battery is not very good when it is injected

Method used

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  • Oil-based PVDF spraying slurry, diaphragm coated with oil-based PVDF spraying slurry as well as preparation method and application of diaphragm
  • Oil-based PVDF spraying slurry, diaphragm coated with oil-based PVDF spraying slurry as well as preparation method and application of diaphragm
  • Oil-based PVDF spraying slurry, diaphragm coated with oil-based PVDF spraying slurry as well as preparation method and application of diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A preparation method for oil-based PVDF spray slurry, comprising the following steps:

[0037] Stir the polyvinylidene fluoride rapidly for 2 hours and evenly disperse it in the first solvent, then add the second solvent and mix evenly to obtain the oil-based PVDF spray slurry, wherein, in parts by mass, polyvinylidene fluoride, the first solvent and The ratio of the second solvent is 0.2:10:0.1, the first solvent is diethyl ether, and the second solvent is tripropylene glycol.

Embodiment 2

[0039] A preparation method for oil-based PVDF spray slurry, comprising the following steps:

[0040] Stir the polyvinylidene fluoride rapidly for 6h and disperse it uniformly in the first solvent, then add the second solvent and mix evenly to obtain the oil-based PVDF spray slurry, wherein, in parts by mass, polyvinylidene fluoride, the first solvent and The ratio of the second solvent is 1:10:1, the first solvent is ethanol, and the second solvent is isopropanol.

Embodiment 3

[0042] A preparation method for oil-based PVDF spray slurry, comprising the following steps:

[0043] Stir the polyvinylidene fluoride rapidly for 3 hours and evenly disperse it in the first solvent, then add the second solvent and mix evenly to obtain the oil-based PVDF spray slurry, wherein, in parts by mass, polyvinylidene fluoride, the first solvent and The ratio of the second solvent is 0.7:10:0.6, the first solvent is acetone, and the second solvent is deionized water.

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Abstract

The invention discloses oil-based PVDF spraying slurry, a diaphragm coated with the oil-based PVDF spraying slurry as well as a preparation method and application of the diaphragm. The preparation method comprises the following steps: 1, uniformly dispersing polyvinylidene fluoride in a first solvent and adding a second solvent, and uniformly mixing the components to obtain the oil-based PVDF spraying slurry; wherein the mass part ratio of the polyvinylidene fluoride to the first solvent to the second solvent is (0.2-1) : 10: (0.1-1), the first solvent is diethyl ether, ethanol or acetone, andthe second solvent is tripropylene glycol, isopropanol or water. The oil-based PVDF spraying slurry disclosed by the invention can solve the problem of insufficient binding power of a water-based PVDF spraying diaphragm coating, ensures that the air permeability of the diaphragm is not influenced by the oil-based spraying coating, meets the requirement of lithium ion migration, reduces the cost of the oil-based PVDF coating, and is more in line with the requirement of the market.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to an oil-based PVDF spray slurry, a separator coated with an oil-based PVDF spray slurry, a preparation method and an application thereof. Background technique [0002] In battery applications, the PVDF coated separator is mainly based on the principle of gel electrolyte, and the function of bonding the separator and the pole piece to increase the hardness of the battery cell. PVDF spray coating diaphragm has gradually become one of the types of diaphragms on the market. The main thing is to spray water-based PVDF slurry. Water-based PVDF often fails to meet customer needs in terms of cohesion. Although the oil-based PVDF coating diaphragm has better adhesion, it also has some disadvantages: [0003] 1) Due to the inclusion of the extraction process, the cost is too high; [0004] 2) The air permeability value-added of oil-based PVDF coatings is higher th...

Claims

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Application Information

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IPC IPC(8): C09D127/16C09D7/20C08J7/04H01M2/16H01M2/14C08L23/06
CPCC08J2323/06C08J2427/16C09D127/16C09D7/20Y02E60/10
Inventor 袁海朝徐锋贾亚峰郗腾苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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