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Application of porous membrane in alkaline zinc-iron flow battery

A liquid flow battery and porous membrane technology, applied in the direction of fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as instability and hindering technology development, to overcome poor stability, expand types and use range, and controllable thickness Effect

Inactive Publication Date: 2018-06-08
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

At present, there is no professional ion-exchange membrane material for zinc-iron. The main reason is that zinc-iron flow batteries are alkaline systems, and anion-exchange membranes should generally be used. However, most anion-exchange membranes are currently unstable in alkaline media, hindering further development of the technology

Method used

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  • Application of porous membrane in alkaline zinc-iron flow battery
  • Application of porous membrane in alkaline zinc-iron flow battery
  • Application of porous membrane in alkaline zinc-iron flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 7.5 grams of polyacrylonitrile in 30ml of DMSO and 10ml of THF, stir for 5 hours, spread the polymer solution on a glass plate with a thickness of 250μm, then quickly immerse in 5L of water, solidify, and form a pore size of 50nm with a porosity of 55 % porous membrane.

[0032] The prepared porous membrane 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 ethanol for 2 hours, and the water in it was replaced.

[0033] The prepared porous membrane is used to assemble the alkaline system zinc-iron flow battery, in which the catalytic layer is activated carbon felt, the bipolar plate is graphite plate, and the effective area of ​​the membrane is 48cm 2 , with a current density of 80mA cm -2 , the zincate ion concentration in the electrolyte is 0.5mol L -1 , the concentration of ferrocyanogen cyanide ion is 1mol L -1 . The coulombic eff...

Embodiment 2

[0041] Same as Example 1, the polymer is replaced by polysulfone, and other conditions remain unchanged.

Embodiment 3

[0043] Same as Example 1, the polymer is replaced by polyimide, the solvent is replaced by NMP, and other conditions remain unchanged.

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Abstract

The invention discloses an application of a porous membrane in an alkaline zinc-iron flow battery. The porous membrane is a porous conductive membrane prepared from one, two or more organic polymer resin as a raw material with a phase conversion method. The porous conductive membrane has the membrane pore size of 1-10 nm and porosity of 40%-70%. The porous conductive membrane has higher ion selectivity and can effectively solve the migration problem of electrolyte solutions, prolong the cycle life of the battery and improve the performance of the battery, and meanwhile, the production cost ofmembrane materials of flow energy storage batteries is substantially reduced.

Description

technical field [0001] The invention relates to the field of zinc-iron flow batteries, in particular to the application of a diaphragm in alkaline zinc-iron flow batteries. Background technique [0002] Liquid flow energy storage 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 location selection, deep discharge, safety and environmental protection, and maintenance. With the advantages of low cost, 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. Due to the advantages of high safety, good stability, and long life (life > 15 years), the alkaline system zinc-iron flow battery has better advantages, especially in terms of cost, and is considered to have high development ...

Claims

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Application Information

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IPC IPC(8): H01M8/0239H01M8/18
CPCH01M8/0239H01M8/188Y02E60/50
Inventor 李先锋段寅琦张华民袁治章
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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