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Adhesive composite diaphragm and manufacturing method thereof

A composite separator and porous membrane technology, which is applied in the direction of separators/films/diaphragms/spacers, structural parts, electrical components, etc., can solve the problems of diaphragm shrinkage or melting, battery combustion and explosion, battery short circuit, etc., to reduce heat Effects of shrinkage, improvement of production efficiency, and improvement of heat resistance

Inactive Publication Date: 2015-02-04
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the separators used in lithium-ion batteries are generally polyolefin-based porous membranes. Since the melting point of this polyolefin-based porous membrane is lower than 200 ° C, when the temperature of the battery increases due to internal or external factors, this separator will shrink or melt. , causing direct contact between the positive and negative electrodes, resulting in a short circuit of the battery, which can cause accidents such as battery combustion and explosion

Method used

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  • Adhesive composite diaphragm and manufacturing method thereof
  • Adhesive composite diaphragm and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047]A bondable composite diaphragm, comprising a porous polypropylene membrane and a hybrid coating coated on one side of the porous polypropylene membrane, wherein the porous polypropylene membrane has a thickness of 16um, a porosity of 42%, and a coating thickness of 4um, The coating slurry used for the hybrid coating consists of a composition and deionized water; the composition includes 30 parts of polyvinylidene fluoride-hexafluoropropylene copolymer particles with a particle size of 200 nm calculated in parts by mass, and the ceramic particles are oxidized 70 parts of silicon, 2 parts of water-based adhesive polyvinyl alcohol, 4 parts of water-based adhesive polymethyl methacrylate, 1 part of carboxylate fluorine dispersant, 1 part of water-based dispersant sodium polyacrylate, high water solubility It consists of 2 parts of molecular thickener hydroxyethyl cellulose and 5 parts of wetting agent fluoroalkyl methoxy ether alcohol.

[0048] Prepare the described composit...

Embodiment 2

[0058] A bondable composite diaphragm, comprising a polyethylene porous membrane and a mixed coating coated on both sides of the polyethylene porous membrane, wherein the polyethylene porous membrane has a thickness of 5um, a porosity of 30%, and the coating thickness on both sides is uniform is 2um, and the coating slurry used for the mixed coating is composed of a composition and deionized water; the composition includes 50 parts of polyacrylonitrile particles with a particle diameter of 1um calculated in parts by mass, and 50 parts of ceramic particles of aluminum sesquioxide , water-based adhesive styrene-butadiene latex 5 parts, water-based adhesive polybutylmethacrylate 3 parts, water-based dispersant sulfonate fluorine dispersant 0.5 part, water-based dispersant potassium polyacrylate 0.5 part, water-soluble polymer It consists of 3 parts of sodium carboxymethyl cellulose as a thickening agent and 1 part of wetting agent fluoroalkyl ethoxy ether alcohol.

[0059] Prepar...

Embodiment 3

[0069] A bondable composite diaphragm, comprising a polypropylene / polyethylene / polypropylene composite porous film and a mixed coating coated on one side of the polypropylene / polyethylene / polypropylene composite porous film, wherein the polypropylene / polyethylene / polypropylene The thickness of the polypropylene composite porous film is 20um, the porosity is 39%, and the coating thickness is 5um. The coating slurry used for the mixed coating is composed of composition and deionized water; 20 parts of 2um polyethylene oxide particles, 80 parts of ceramic particles boehmite, 5 parts of water-based adhesive ethylene-vinyl acetate copolymer, 3 parts of water-based dispersant sodium polyacrylate, water-soluble polymer thickener polyacrylamide 5 parts, and 3 parts of wetting agent alkylphenol polyoxyethylene ether.

[0070] Prepare the described composite membrane with bonding function; including the following preparation steps:

[0071] (1) Add 3 parts of water-soluble polymer thic...

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Abstract

The invention discloses an adhesive composite diaphragm, comprising a polyolefin porous membrane and one or two hybrid coatings applied onto one or two sides of the polyolefin porous membrane, wherein each hybrid coating is 2-8 microns thick and comprises 10-50 parts by mass of polymer particles and 50-90 parts by mass of ceramic particles. The invention also discloses a manufacturing method of the composite diaphragm. The diaphragm disclosed by the invention has the advantages that the thermal stability of the diaphragm is effectively improved, and the diaphragm and a battery pole piece can bond with each other.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a bondable composite diaphragm capable of effectively improving the thermal stability of the diaphragm and bonding the diaphragm and battery pole pieces together and a manufacturing method thereof. Background technique [0002] In the lithium-ion battery, the main function of the separator is to separate the positive and negative electrodes of the battery and prevent short circuit caused by contact between the two electrodes. It is one of the key inner components. The performance of the separator determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle and safety performance of the battery. A separator with excellent performance plays an important role in improving the overall performance of lithium-ion batteries. [0003] At present, the separators used in lithium-ion batteries are generally polyolefin-based porous membranes. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/18H01M50/403H01M50/417H01M50/434H01M50/443H01M50/449H01M50/451H01M50/457
CPCH01M50/403H01M50/463Y02E60/10
Inventor 谭斌陈良
Owner SHENZHEN SENIOR TECH MATERIAL
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