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

A technology for flow batteries and composite membranes, applied in neutral system zinc-iron flow batteries, in the field of composite membranes for neutral system zinc-iron flow batteries, can solve problems such as the difficulty of reducing pore size, and achieve the expansion of types and the effect of using range

Inactive Publication Date: 2017-04-05
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

[0010] However, when the pore size of this porous membrane is small to a certain extent, it will be more difficult to continue to reduce the pore size. How to further improve the ion selective permeability of the porous membrane has become an important problem in solving this type of membrane.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 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.

[0038] 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.

[0039] A DMAC solution of Nafion resin with a concentration of 2wt.% was prepared and coated on the surface of the porous membrane with a spin coater. Rotate at a high speed until the coating solution is dry to prepare a composite porous membrane (A).

[0040] Use the prepared composite 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 effe...

Embodiment 2

[0052] Same as Example 1, the organic polymer resin is replaced by polysulfone, and other conditions remain unchanged.

Embodiment 3

[0054] 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 relates to an application of a composite membrane in a neutral system zinc-iron flow battery. A porous membrane, which is prepared from one or more of organic polymer resins, is taken as the matrix, and a compact membrane, which is made of cationic polymer resin, is compounded on the surface of the porous membrane to prepare the composite membrane. Compared with the original porous membrane, the composite membrane has a higher hydrophilic performance and stronger ion selectivity, can effectively solve the problem of migration of electrolyte solution, prolongs the circulation life of batteries, and improves the performance of batteries, and at the same time, the production cost of the composite membrane of the flow battery is reduced.

Description

technical field [0001] The invention relates to a polymer electrolyte diaphragm material for a neutral system zinc-iron flow battery, in particular to a composite membrane for a neutral system zinc-iron flow battery and its application in a neutral system zinc-iron 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...

Claims

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Application Information

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IPC IPC(8): H01M8/0239H01M8/18
CPCH01M8/0239H01M8/0245H01M8/188Y02E60/50
Inventor 段寅琦李先锋张华民赖勤志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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