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Application of porous membrane in neutral system zinc-iron flow battery

A liquid flow battery and porous membrane technology, applied in battery electrodes, regenerative fuel cells, battery components, etc., can solve the problems of reducing oxidation stability and limiting service life, and achieve controllable adjustment, expansion of types and application range Effect

Inactive Publication Date: 2016-07-06
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

However, for most non-fluorine ion exchange membranes, the introduction of ion exchange groups greatly reduces the oxidation stability of the membrane and limits the service life of the membrane in the neutral system zinc-iron flow battery

Method used

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  • Application of porous membrane in neutral system zinc-iron flow battery
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  • Application of porous membrane in neutral system zinc-iron flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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.

[0029] 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 ethanol for 2 hours, and the water in it was replaced.

[0030] Use the prepared porous membrane to assemble a neutral system zinc-iron flow battery, in which the catalytic layer is activated carbon felt, the bipolar plate is a graphite plate, and the effective area of ​​the membrane is 48cm 2 , with a current density of 80mAcm -2 , the concentration of zinc ions in the electrolyte is 0.5molL -1 , the concentration of ferrous ions is 1molL -1 . The Coulombic efficiency (CE) of the assembled neutral system...

Embodiment 2

[0034] Same as Example 1, the polymer is replaced by polysulfone, and other conditions remain unchanged.

Embodiment 3

[0036] 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 relates to an application of a porous membrane in a neutral system zinc-iron flow battery. The porous membrane is a porous conductive membrane which is prepared from more than one or two organic polymer resins as a raw material through a phase inversion method, wherein the membrane aperture size of the porous conductive membrane is 0.1-100nm; and the porosity is 5%-70%. Compared with original other ion exchange membranes, the porous conductive membrane has relatively high ionic selectivity, can effectively inhibit the migration problem of an electrolyte solution; the cycle lifetime of the battery is prolonged; the battery performance is improved; and meanwhile, the production cost of a membrane material for the system flow battery is greatly reduced.

Description

technical field [0001] The invention relates to a polymer electrolyte diaphragm material used in a neutral system zinc-iron liquid 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. Due to the advantages of high safety, good stability, long life (life > 15 years), and low cost, the neutral system zinc-iron flow battery is considered to be a kind of flow battery with high development potential. [0003] The battery separator is an important part of the flow battery, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M2/14H01M4/94H01M4/88H01M8/18
CPCY02E60/50
Inventor 段寅琦张华民李先锋赖勤志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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