A kind of bifunctional composite porous membrane and its preparation and application

A porous membrane and dual-function technology, which is applied in the field of composite membrane materials for flow batteries, can solve the problems of poor oxidation resistance and low vanadium permeability, and achieve the effects of solving capacity decay, process environmental protection, and improving selective permeability

Active Publication Date: 2017-05-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with cation-exchange membranes, anion-exchange membranes have low vanadium permeability in VFB due to their positively charged fixed ion-exchange groups and the repulsion of vanadium ions, but their oxidation resistance is poor. The cathode side of the battery, improving the Coulombic efficiency of the battery

Method used

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  • A kind of bifunctional composite porous membrane and its preparation and application
  • A kind of bifunctional composite porous membrane and its preparation and application
  • A kind of bifunctional composite porous membrane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Dissolve 3g of polyetheretherketone in 29.58ml of DMAc. After the sulfonated polyether ether ketone is completely dissolved, add 12g of polyether ether sulfone and stir for 12 hours until a transparent and uniform polymer solution is formed; stop stirring and let it stand for 4 hours. Degassing on a hot stage at a temperature of 40°C. Then the polymer solution was scraped onto the surface of the glass plate with a spatula to form a primary film with a thickness of about 200 μm, which was quickly immersed in 5 L of water and cured to form a porous diaphragm. Soak it in deionized water for 2 hours to prepare a porous membrane matrix with a thickness of about 125-130 μm.

[0052] The prepared porous membrane was cleaned, soaked in ethanol for 2 hours, the water therein was replaced, and placed on a hot stage at 40° C. until a porous membrane with a relatively dry surface was obtained.

[0053] Prepare an aqueous imidazole solution with a concentration of 1.0mol / L, immerse...

Embodiment 2

[0056] Embodiment 2: other conditions are the same, polyethersulfone is replaced by polyether ether ketone.

Embodiment 3

[0057] Embodiment 3: other conditions are the same, polyethersulfone is replaced by polyacrylonitrile.

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Abstract

The invention discloses a preparation of a composite porous membrane for a flow battery and its application in a flow battery, which is prepared from one or more than two kinds of organic polymer resin or sulfonated polymer resin as raw materials The porous membrane is used as a matrix, and cationic and anionic organic resins are respectively compounded on both sides of the matrix to form a composite porous membrane. The preparation method of this type of composite membrane is simple, the process is environmentally friendly, the thickness of the assembled layer is controllable, and the ion selectivity is adjustable. Compared with the original porous diaphragm membrane, the composite membrane has better ion conductivity and vanadium ion barrier ability, and the ion selectivity is greatly improved. In addition, the composite membrane can effectively inhibit the migration of electrolyte solution and solve the problem of capacity fading.

Description

technical field [0001] The invention relates to a composite membrane material for a liquid flow battery, in particular to a positive and negative ion composite porous membrane and its application in a liquid flow battery. Background technique [0002] The stable power supply of renewable energy power generation systems and the construction of smart grids urgently require the development of efficient, cheap, safe and reliable large-scale energy storage technologies. Flow batteries have become the first choice for large-scale energy storage technology due to their long cycle life, high energy conversion efficiency, low initial investment cost, low operation and maintenance costs, environmental friendliness, freedom of site selection, short response time and deep discharge. one. [0003] Vanadium redox battery (VFB) realizes the reversible conversion of electrical energy and chemical energy through the electrochemical reaction of vanadium ions of different valence states disso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCH01M50/403H01M50/409Y02E60/10
Inventor 李先锋张华民李云段寅琦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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