Preparation method of ion exchange membrane and application thereof

A technology of ion-exchange membrane and ion-exchange capacity, which is applied in energy storage, final product manufacturing, sustainable manufacturing/processing, etc., can solve problems such as poor mechanical stability and low ion conductivity, and achieve improved energy conversion efficiency and high Effect of ion selectivity, high mechanical and chemical stability

Active Publication Date: 2020-02-11
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a preparation method and application of an ion-exchange membrane, and solve technical problems such as low ion conductivity and poor mechanical stability in the existing ion-exchange membrane

Method used

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  • Preparation method of ion exchange membrane and application thereof
  • Preparation method of ion exchange membrane and application thereof
  • Preparation method of ion exchange membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Dissolve perfluorosulfonic acid resins with ion exchange capacities of 0.9mmol / g, 1.0mmol / g, 1.1mmol / g, and 1.2mmol / g in dimethyl sulfoxide to obtain the concentration of perfluorosulfonic acid resin Be 12wt% perfluorosulfonic acid resin solution;

[0022] 2) Immerse the prepared perfluorosulfonic acid resin solution on a clean polytetrafluoroethylene porous mesh cloth for 1 hour, then hang it in a blast drying oven at 125°C and dry it for 10 minutes, then repeat the above dipping-drying process The procedure is more than 3 times, and the perfluorosulfonic acid membrane supported by mesh cloth is prepared;

[0023] 3) Soak the mesh-supported perfluorosulfonic acid membrane prepared in step 2) in deionized water at 80°C under normal pressure, boil it for 1 hour, rinse it several times and dry it to obtain the ion exchange membrane J1, J2, J3, J4.

Embodiment 2

[0025] 1) Dissolve perfluorosulfonic acid resins with ion exchange capacities of 0.9mmol / g, 1.0mmol / g, 1.1mmol / g, and 1.2mmol / g in dimethyl sulfoxide to obtain the concentration of perfluorosulfonic acid resin Be 15wt% perfluorosulfonic acid resin solution;

[0026] 2) Coat the prepared perfluorosulfonic acid resin solution on a clean polytetrafluoroethylene porous mesh cloth with a scraper, then place it in a blast drying oven at 125°C and dry it for 3 hours, then repeat the above dipping-drying The drying procedure is more than 3 times, and the perfluorosulfonic acid membrane supported by mesh cloth is prepared;

[0027] 3) Soak the mesh-supported perfluorosulfonic acid membrane prepared in step 2) in deionized water at 80°C under normal pressure, boil for 1 hour, rinse and dry it several times, and then the ion-exchange membrane G1, G2, G3, G4.

Embodiment 3

[0029] mPBI was stirred and dissolved in N-methylpyrrolidone (NMP) at 100-180°C to form a clear and transparent solution with a concentration of 0.001-1wt%, and the undissolved mPBI particles were removed by filtration, and then the ion exchange membrane J1, J2, J3, J4 and ion exchange membranes G1, G2, G3, G4 were soaked flatly in the PBI solution for 5s-24h respectively, after soaking, the membranes were taken out and hung in a blast drying oven at 100-200°C After drying for 4 hours and lowering to room temperature, seal the film and store it in a plastic bag for later use.

[0030] Test the water absorption rate, swelling rate and vanadium ion permeability of different impregnated membranes. The test methods and results are as follows:

[0031] 1) Water absorption and swelling rate:

[0032] Cut the obtained membrane into a size of 1cm×4cm, soak it in deionized water for 24 hours at room temperature, take it out, blot the water on the surface of the membrane with filter pa...

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Abstract

The invention relates to a preparation method of an ion exchange membrane and an application thereof, belongs to the technical field of ion exchange membrane preparation process, and mainly solves thetechnical problems of low ion conductivity, poor mechanical stability and the like existing in the present ion exchange membrane. The technical scheme of the invention is as follows: the preparationmethod of the ion exchange membrane comprises the following steps: 1) dissolving a perfluorosulfonic acid resin in a high boiling point polar solvent to prepare a perfluorosulfonic acid resin solution; 2) coating the perfluorosulfonic acid resin solution on a clean polytetrafluoroethylene porous mesh cloth through casting, dipping or scraper to prepare a mesh cloth supported perfluorosulfonic acidmembrane; and 3) soaking the mesh cloth supported perfluorosulfonic acid membrane in the nitrogen-containing heterocyclic polymer resin solution, then thoroughly drying the membrane, rinsing with water for many times and drying the membrane so as to obtain the ion exchange membrane. The preparation method has the advantages of high ion selectivity, high mechanical and chemical stability and the like.

Description

technical field [0001] The invention belongs to the technical field of ion-exchange membrane preparation technology, and in particular relates to a preparation method and application of an ion-exchange membrane. Background technique [0002] The progress of human society is the progress of energy utilization. The current society is facing severe environmental and energy problems, and the human demand for efficient, clean and safe energy has become very urgent. However, the instability of new energy sources such as wind power and photovoltaics will lead to abnormal fluctuations in the power grid system, so large-scale energy storage technology is the preferred method to solve this problem. Among electrochemical energy storage technologies, acid electrolyte flow batteries have received worldwide attention, especially all-vanadium redox flow batteries (VFB, referred to as vanadium batteries), which have high safety, long service life, and High discharge efficiency and flexible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0221H01M8/0228H01M8/0239H01M8/18
CPCH01M8/188H01M8/0239H01M8/0228H01M8/0221Y02P70/50
Inventor 李南文耿康李瑛
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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