Preparation method of ion exchange membrane for alkaline redox flow battery

An ion exchange membrane and flow battery technology, applied in the field of alkaline redox flow battery energy storage, can solve the problem of high price of nafion membrane, and achieve the effects of excellent ion selectivity, preventing cross-contamination and good chemical stability.

Inactive Publication Date: 2019-12-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art and break through the shackles of ion-exchange membranes, the purpose of the present invention is to propose a method for preparing ion-exchange membranes for alkaline redox flow batteries, using low-cost SPEEK diaphragms to solve the problem of alkaline The problem of expensive nafion membranes in flow batteries

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  • Preparation method of ion exchange membrane for alkaline redox flow battery
  • Preparation method of ion exchange membrane for alkaline redox flow battery
  • Preparation method of ion exchange membrane for alkaline redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, the preparation method of the ion exchange membrane for the alkaline redox flow battery is as follows:

[0039] 1. The ionization treatment process of the sulfonated polyetheretherketone diaphragm comprises the following steps:

[0040] (1) Weigh the polyether ether ketone powder and place it in concentrated sulfuric acid with a concentration of 98wt%, and stir and react at a constant temperature of 45°C for 3.5 to 4 hours; wherein, the mass-volume ratio of polyether ether ketone powder to concentrated sulfuric acid is 1 / 30 (g / mL), the particle size of polyether ether ketone powder is 50-60 μm.

[0041] (2) Pour the solution after the reaction into deionized water at 150mL / min to coagulate into a floc, then wash with deionized water to pH = 7, and dry at a constant temperature of 60°C for about 24 hours to obtain dry flocculent sulfonated polymer ether ether ketone;

[0042] (3) Dissolve flocculent sulfonated polyether ether ketone in N,N-dimethylformam...

Embodiment 2

[0051] In this example, the preparation method of the ion exchange membrane for the alkaline redox flow battery is as follows:

[0052] 1. The ionization treatment process of the sulfonated polyetheretherketone diaphragm comprises the following steps:

[0053] (1) Weigh the polyether ether ketone powder and place it in concentrated sulfuric acid with a concentration of 98wt%, and stir and react at a constant temperature of 50°C for 3 to 3.5 hours; wherein, the mass-volume ratio of polyetheretherketone powder to concentrated sulfuric acid is 1 / 25 (g / mL), the particle size of polyether ether ketone powder is 50-60 μm.

[0054] (2) Pour the solution after the reaction into deionized water at 120mL / min to coagulate into a floc, then wash with deionized water to pH = 7, and dry at a constant temperature of 70°C for about 18 hours to obtain dry flocculent sulfonated polymer ether ether ketone;

[0055] (3) Dissolve flocculent sulfonated polyether ether ketone in N,N-dimethylforma...

Embodiment 3

[0064] In this example, the preparation method of the ion exchange membrane for the alkaline redox flow battery is as follows:

[0065] 1. The ionization treatment process of the sulfonated polyetheretherketone diaphragm comprises the following steps:

[0066] (1) Weigh the polyether ether ketone powder and place it in concentrated sulfuric acid with a concentration of 98wt%, and stir and react at a constant temperature of 40°C for 4 to 4.5 hours; wherein, the mass-volume ratio of polyether ether ketone powder to concentrated sulfuric acid is 1 / 40 (g / mL), the particle size of polyether ether ketone powder is 50-60 μm.

[0067] (2) The solution after the reaction is poured into deionized water at 180mL / min to coagulate into a floc, then washed with deionized water to pH = 7, and dried at a constant temperature of 50°C for about 30h to obtain a dry flocculent sulfonated polymer ether ether ketone;

[0068] (3) Dissolve flocculent sulfonated polyether ether ketone in N,N-dimet...

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Abstract

The invention relates to the field of alkaline redox flow battery energy storage, in particular to a preparation method of an ion exchange membrane for an alkaline redox flow battery, which is mainlyused for solving the problem of the high price of a Nafion diaphragm in the alkaline redox flow battery at the present stage, so that the cost of the redox flow battery is greatly reduced. An alkalineaqueous solution of ferricyanide (such as Na3[Fe(CN)6], K3[Fe(CN)6], (NH4)3[Fe(CN)6] and the like) is used as a positive electrolyte, and a strong alkaline solution (such as KOH, NaOH and the like) is used as a negative electrolyte; graphite felt and carbon felt are selected as positive electrode materials, and a zinc plate is selected as a negative electrode material; and the ionized sulfonatedpolyether ether ketone (SPEEK) diaphragm is used as an ion exchange membrane to assemble the battery. Therefore, the alkaline redox flow battery system with low cost and high performance is obtained.The flow battery system provided by the invention has the advantages of the high open-circuit voltage, the low cost, the high efficiency, the good cycling stability, safety, reliability and the like,and has a wide application prospect.

Description

Technical field: [0001] The invention relates to the field of energy storage of alkaline redox flow batteries, in particular to a preparation method of ion exchange membranes for alkaline redox flow batteries. Background technique: [0002] The development and utilization of clean energy (such as: wind energy, solar energy, etc.) is an inevitable trend of future energy development, but these energy sources are easily affected by the weather and cannot be continuously and effectively integrated into the grid. Therefore, it is very important to develop an economical, efficient and stable large-scale energy storage technology and effectively store various new energy sources. Due to their flexible structure, long cycle life, safety and reliability, flow batteries have become one of the most promising candidates for energy storage. All-vanadium redox flow batteries have excellent electrochemical performance. However, in recent years, the skyrocketing price of vanadium ore resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M4/86H01M4/96H01M8/083H01M8/18
CPCH01M8/083H01M8/188H01M4/96H01M4/86H01M2300/0014H01M2004/8684H01M50/403H01M50/411Y02E60/50Y02E60/10
Inventor 贾传坤韩杰丁美
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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