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Molecular sieve composite porous membrane used for redox flow battery, and preparation method and application of molecular sieve composite porous membrane

A flow battery, porous membrane technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as restricting hydrogen ion transmission, improve ion selectivity, improve single cell performance, and expand types and use. Effect

Inactive Publication Date: 2017-06-20
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

The blocking of vanadium ions and the selective permeation of hydrogen ions by porous membranes are realized through the regulation of the pore size of the membrane, but too small pore size will limit the transmission of hydrogen ions, so there is an optimal value for the regulation of pore size

Method used

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  • Molecular sieve composite porous membrane used for redox flow battery, and preparation method and application of molecular sieve composite porous membrane
  • Molecular sieve composite porous membrane used for redox flow battery, and preparation method and application of molecular sieve composite porous membrane
  • Molecular sieve composite porous membrane used for redox flow battery, and preparation method and application of molecular sieve composite porous membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Dissolve 7.5 g of polyacrylonitrile in 30 ml of DMSO and 10 ml of THF, stir for 5 hours, spread the resulting polymer solution on a glass plate with a thickness of 250 μm, and then quickly immerse it in 5 L of water to solidify to form a porous diaphragm.

[0039] The prepared porous diaphragm was treated in 10 wt.% sodium hydroxide aqueous solution for 55 minutes, and the treatment temperature was 55°C. Then the membrane was cleaned with deionized water, soaked in isopropanol for 2 hours, and the water was replaced.

[0040] A DMAc solution of ZSM-35 molecular sieve with a concentration of 2wt.% was prepared, and 5wt.% polyvinylidene fluoride resin was added therein, and coated on the surface of the porous membrane by spraying. A composite porous membrane (A) was obtained.

[0041] The all-vanadium redox flow battery is assembled by using the prepared composite membrane, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the ...

Embodiment 2

[0046] Same as Example 1, the organic polymer resin is replaced by polysulfone, and other conditions remain unchanged.

Embodiment 3

[0048] Same as Example 1, the organic polymer resin is replaced by polyimide, the solvent is replaced by NMP, and other conditions remain unchanged.

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Abstract

The invention discloses a preparation method of an inorganic molecular sieve composite porous membrane used for a redox flow battery, and an application of the inorganic molecular sieve composite porous membrane in the redox flow battery. The porous membrane, which is prepared by taking one or more than two kinds of organic macromolecule resins as the raw material, is used as a base body; and the surface of the base body is compounded with an inorganic molecular sieve to form the composite porous membrane. The composite porous membrane has simple preparation method, environment-protection process, controllable inorganic molecular sieve types and bore diameters, and adjustable ionic selectivity; compared with an original porous diaphragm, the molecular sieve composite porous membrane has relatively high ionic conductivity and ion blocking capability, so that the ionic selectivity is greatly improved; and in addition, by virtue of the composite membrane, mobility of an electrolyte solution can be effectively suppressed and the problem of capacity fading can be solved.

Description

technical field [0001] The invention relates to a composite membrane material for a flow battery, in particular to an inorganic molecular sieve composite porous membrane and its application in a flow battery. Background technique [0002] Liquid flow battery is a new electrochemical energy storage technology. Compared with other energy storage technologies, it has high energy conversion efficiency, flexible system design, large storage capacity, free site selection, deep discharge, safety and environmental protection, and low maintenance costs. It can be widely used in wind energy, solar energy and other renewable energy generation and energy storage, emergency power system, backup power station and power system peak shaving and valley filling. The all-vanadium redox flow battery is considered to be a kind of flow battery with high development potential due to its advantages of high safety, good stability, long life (life > 15 years), and low cost. [0003] The battery s...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/446Y02E60/10
Inventor 段寅琦张华民李先锋袁治章史丁秦
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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