Diaphragm with stereoscopic composite structure and preparation method and application thereof

A three-dimensional composite and diaphragm technology, which is applied to structural parts, coatings, electrical components, etc., can solve problems such as unsupported film formation, applications that cannot meet safety requirements, and mechanical performance degradation of the diaphragm.

Active Publication Date: 2017-10-03
厦门益舟新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, as the temperature rises, after the polyolefin base film melts, the mechanical properties of the separator drop significantly, the membrane breaks, and even cannot support the film formation.
Obviously, this cannot meet the needs of applications requiring high security

Method used

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  • Diaphragm with stereoscopic composite structure and preparation method and application thereof
  • Diaphragm with stereoscopic composite structure and preparation method and application thereof
  • Diaphragm with stereoscopic composite structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Preparation of a diaphragm with a three-dimensional composite structure and its application in lithium-ion batteries

[0062] Preparation of Ceramic Coated Separators:

[0063] Fully mix silica spherical powder with a particle size of about 300nm, binder (styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC)) to make a slurry, and its mass ratio is: silica / SBR / CMC=0.95g / 0.03g / 0.02g, the solvent is a water / ethanol mixture with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10.

[0064] The prepared slurry was evenly coated on both sides of a commercial polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50° C. for 10 hours to obtain a silica ceramic coated separator.

[0065] Preparation of a diaphragm with a stereocomposite structure:

[0066] A water-soluble phenolic resin solution with a mass fraction of 1% was prepared by using a water / ethanol mixture ...

Embodiment 2

[0071] Example 2: Preparation of a diaphragm with a three-dimensional composite structure and its application in lithium-ion batteries

[0072] Preparation of Ceramic Coated Separators:

[0073] Fully mix alumina powder with a particle size of 300nm and a binder (polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)) to make a slurry, the mass ratio of which is: alumina / PVDF-HFP=0.9g / 0.1g, the solvent is NMP / acetone mixed solution with a volume ratio of 1:1, and the mass ratio of liquid to solid is 90:10.

[0074] The prepared slurry was evenly coated on one side of a commercial polyethylene (PE) separator with an automatic coating machine, and after drying at room temperature, it was dried in vacuum at 50° C. for 10 hours to obtain an alumina ceramic coated separator.

[0075] Preparation of a diaphragm with a stereocomposite structure:

[0076] A water-soluble phenolic resin solution with a mass fraction of 1% was prepared by using a water / ethanol mixture with a volume r...

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Abstract

The invention relates to a diaphragm with a stereoscopic composite structure and a preparation method and application thereof. The diaphragm with the stereoscopic composite structure comprises an organic diaphragm substrate, the ceramic layer is coated on single surface or double faces of the organic diaphragm substrate; the diaphragm further comprises a continuous polymer layer transversely and longitudinally penetrating the organic diaphragm substrate and the ceramic layer hole and surface; the organic diaphragm substrate and the ceramic layer are integrated through the continuous polymer layer; and the continuous polymer layer is formed by dipping the organic diaphragm substrate coated with the ceramic layer in a polymer solution or spraying and blade-coating the polymer solution on the organic diaphragm substrate coated with the ceramic layer. The diaphragm with the stereoscopic composite structure disclosed by the invention is excellent in comprehensive performance, has good innovation and practicability, and has good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of new energy, is applied to products such as batteries and capacitors, and specifically relates to a diaphragm with a three-dimensional composite structure and a preparation method thereof. More specifically, the present invention includes a separator with a ceramic coating and a continuous polymer layer that penetrates both the pores and the surface of the organic separator substrate and the ceramic layer horizontally and vertically, and has a three-dimensional composite structure. The invention also relates to the application of the diaphragm with the three-dimensional composite structure in chemical power systems such as lithium ion batteries, and the battery containing the diaphragm. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which is composed of positive electrode, negative electrode, separator and electrolyte. . During the charging and discharging process, Li ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0525C08J7/04C09D1/00C09D7/12
CPCC08J2323/06C08J2461/06C09D1/00C08J7/0423H01M10/0525H01M50/403H01M50/411H01M50/431H01M50/449Y02E60/10
Inventor 肖冰
Owner 厦门益舟新能源科技有限公司
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