A kind of composite membrane and its application

A composite diaphragm and base film technology, applied in the field of electrochemistry, can solve the problem of single function of the composite diaphragm, achieve the effects of improving wettability and ion conductivity, improving thermal stability, and controlling thermal shrinkage

Active Publication Date: 2017-11-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The function of the composite diaphragm prepared above is relatively simple

Method used

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  • A kind of composite membrane and its application
  • A kind of composite membrane and its application
  • A kind of composite membrane and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The aluminum oxide nanoparticle of synthesis and sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) mass ratio are 95:2:3 mixing powder 1g, put into deionized water and acetone (3:1, v : v) 10ml of mixed solution, the resulting slurry was ball-milled overnight, the mixed slurry was ultrasonically dispersed for 20 minutes, and the resulting slurry was coated on one side of a common commercially available PE diaphragm. Preheat at 60°C with an electric heating plate, wait for most of the solvent to volatilize, and dry in a vacuum oven at 60°C overnight to completely remove the solvent and obtain a modified single-sided composite diaphragm.

[0048] The synthetic polyethylene (PE) spherical particles and sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) mass ratio are 95:2:3 mixed powder 1g, put into deionized water and acetone (3: 1, v:v) Mix 10ml of the solution, ball mill the obtained slurry overnight, disperse the mixed slurry ul...

Embodiment 2

[0051] Put 1 g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) into 10 ml of a mixed solution of nitrogen-methylpyrrolidone (NMP) and acetone with a mass ratio of 8:2, ball-mill the resulting slurry overnight and ultrasonically for 20 minutes, and coat the resulting slurry with Apply to one side of ordinary polyethylene (PE) diaphragm. Preheat at 60°C with an electric heating plate, wait for most of the solvent to volatilize, and dry in a vacuum oven at 60°C overnight to completely remove the solvent and obtain a modified single-sided composite diaphragm.

[0052] It is 90:4:6 mixed powder 1g with the mass ratio of the alumina nanoparticle of synthesis and sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR), put into deionized water and ethanol (3:1, v : v) 10ml of mixed solution, the resulting slurry was ball-milled overnight, the mixed slurry was ultrasonically dispersed for 20 minutes, and the resulting slurry was coated on the other side of the...

Embodiment 3

[0055] Mix 1g of the synthesized silicon oxide nanoparticles with polyacrylate terpolymer latex (LA132) in a mass ratio of 90:10, put 15ml of mixed solvent of deionized water and ethanol solvent (3:1, v:v), The obtained ceramic slurry was ball-milled overnight, the mixed slurry was ultrasonically dispersed for 30 minutes, and the obtained slurry was coated on one side of a common polypropylene (PP) diaphragm. Preheat at 60°C with an electric heating plate, wait for most of the solvent to volatilize, and dry in a vacuum oven at 60°C overnight to completely remove the solvent and obtain a modified single-sided composite diaphragm.

[0056]Put 1 g of polymethyl methacrylate (PMMA) into 15 ml of a mixed solution of nitrogen-methylpyrrolidone (NMP) and acetone with a mass ratio of 7:3, ball-mill the resulting slurry overnight and ultrasonically for 20 minutes, and apply the resulting slurry to the The other side of the composite separator coated with a single layer of silica partic...

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Abstract

The invention discloses a composite diaphragm and an application thereof. The composite diaphragm includes a microporous base film, one side of the microporous base film is coated with a polymer layer, and the other side is coated with a ceramic layer, and the thickness of coating on both sides is 0.5-20 μm . In the present invention, the polymer coating on the surface of the microporous substrate can effectively improve the wettability and ion conductivity of the diaphragm, and the coating of the ceramic layer can improve the thermal stability of the diaphragm, etc. In addition, the ceramic powder has a large specific surface area, which can effectively absorb Trace amounts of water and acid in the electrolyte can effectively improve the capacity retention of the battery. According to different functions, different polymers or inorganic powders can be selected to modify the diaphragm.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a composite separator and its application. Background technique [0002] At present, chemical power systems using liquid electrolytes, such as lithium-ion batteries, need to use diaphragm materials to block the positive and negative electrodes to avoid short circuits. The diaphragm material is mainly composed of polyethylene (Polyethylene, PE), polypropylene (Polypropylene, PP), polytetrafluoroethylene (Polytetrafluoroethylene, PTFE) and other polymer films or non-woven fabrics containing microporous structures. Liquid electrolyte (generally a carbonate organic solvent containing electrolyte salt) exists in the microporous structure to realize the conduction of ions between the positive and negative electrodes. The separator and liquid electrolyte constitute the electrolyte system. [0003] With the development of fields such as electric vehicles, higher re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M50/457H01M50/491
CPCH01M10/0525H01M50/40H01M50/409H01M50/431H01M50/403H01M50/411Y02E60/10
Inventor 赵金保张鹏石川
Owner XIAMEN UNIV
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