Preparation method of composite membrane

A composite membrane and polymer technology, used in fuel cells, electrochemical generators, electrical components, etc., can solve the problems of high vanadium ion permeability of perfluorosulfonic acid proton exchange membranes and low production efficiency of domestic diaphragm preparation processes. , to achieve the effect of good ion selective permeability, good electrical conductivity and cost reduction

Active Publication Date: 2019-08-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a porous composite ion membrane for an all-vanadium redox flow battery, which solves the problems of high vanadium ion permeability of the currently used perfluorosulfonic acid proton exchange membrane and low production efficiency of the domestic diaphragm preparation process.

Method used

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  • Preparation method of composite membrane

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Effect test

Embodiment 1

[0025] Dissolve 10kg perfluorosulfonic acid resin and 0.3kg polyvinylidene fluoride (PVDF) resin in 100L dimethylacetamide (DMAC), the melt flow rate of polyvinylidene fluoride resin is 10-20g / min, PVDF The vinyl fluoride resin should be dried at 90-110°C for 24 hours before melting. Heat and stir at 200°C for 5-8 hours to dissolve into a gel, add 200 mL of the additive dibutyl phthalate to the mixed solution, stir for 1-3 hours and vibrate in an ultrasonic oscillator for 1-2 hours to make The solution is refined and the tiny bubbles in it are removed, the gel material is put into the extruder and extruded at 170-250°C through the abrasive tool, and then the film is put into 180-200°C, 100-140°C, 60-80°C Gradient heat treatment is carried out in three temperature sections from high to low (its function is to control the volatilization speed of the solvent and the leaching speed of the extractant). After heat treatment, the membrane enters the mixed solution of the extraction a...

Embodiment 2

[0029] Dissolve 10kg perfluorosulfonic acid resin and 0.3kg polybenzimidazole resin in 100L dimethyl sulfoxide, the melt flow rate of polybenzimidazole resin is 5-15g / min, polybenzimidazole resin melts It should be dried at 80-100°C for 24 hours before drying. Heat and stir at 200°C for 5-8 hours to dissolve into a gel, add 400 mL of additive polyvinyl alcohol into the mixed solution, stir for 1-3 hours and vibrate for 1-2 hours in an ultrasonic oscillator to refine the solution and Drive out the tiny air bubbles in it, put the gel material into the extruder and extrude at 170-250°C through the abrasive tool, and then enter the film into three temperature sections of 180-200°C, 100-140°C, and 60-80°C Carry out gradient heat treatment from high to low. After heat treatment, the membrane enters the mixed solution of extractant ethanol and deionized water for extraction, takes out the membrane and washes it with deionized water, and puts the ion exchange membrane into the drying ...

Embodiment 3

[0033] Dissolve 10kg perfluorosulfonic acid resin and 0.3kg polysulfone resin in 100L of N-methylpyrrolidone, the melt flow rate of polysulfone resin and polyethersulfone resin is 20-30g / min, polysulfone resin and polyether The sulfone resin should be dried at 100-120°C for 24 hours before melting. Heat and stir at 200°C for 5 to 8 hours to dissolve into a gel, add 100 mL of the additive polyvinylpyrrolidone to the mixed solution, stir for 1 to 3 hours and vibrate in an ultrasonic oscillator for 1 to 2 hours to refine the solution and Drive out the tiny bubbles, put the gel material into the extruder and extrude at 170-250°C through the abrasive tool, and then enter the film into three temperature sections of 180-200°C, 100-140°C, and 60-80°C Carry out gradient heat treatment from high to low. After heat treatment, the membrane enters the mixed solution of extractant ethanol and deionized water for extraction, takes out the membrane and washes it with deionized water, and puts...

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Abstract

The invention relates to a preparation method of a composite membrane, and belongs to the field of ionic membrane preparation. The preparation method comprises the following steps: by taking perfluorinated sulfonic acid resin with good chemical stability as a membrane material main body, mixing polymers with different functions, dissolving the resin through an organic solvent to obtain slurry, adding an additive, and uniformly mixing to obtain a gel material; putting the gel material into an extruder for extrusion molding, allowing the molded membrane to enter environments of different temperature sections, gradually reducing the different temperature sections from high to low, allowing the membrane subjected to gradient heat treatment to enter an extraction agent for extraction, taking out the membrane, allowing the membrane to enter deionized water for washing and for calendering and rolling through a hot roller to obtain the porous ion exchange composite membrane. The continuous preparation process of the composite membrane is simple, and the prepared membrane is low in swelling, good in size stability, high in mechanical strength, low in vanadium ion permeability, good in chemical and thermal stability, suitable for all-vanadium redox flow batteries, simple to operate and low in requirements for equipment and operators.

Description

technical field [0001] The invention relates to the field of porous composite ion membranes for all-vanadium redox flow batteries (VRB), in particular to a preparation method of the porous composite ion membranes for all-vanadium redox flow batteries. Background technique [0002] The development of new energy sources such as wind energy and solar energy is an important way to solve the shortage of energy resources and represents the direction of future energy development. However, subject to time and geographical dependence, off-grid wind and solar power generation must use energy storage systems, otherwise it is difficult to utilize it around the clock. For direct grid connection, the energy storage system must also be used for peak regulation and frequency regulation of the grid, otherwise it will have a greater impact on the power and frequency of the grid. Therefore, efficient and large-scale energy storage technology has become the key core of its development and appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0239
CPCH01M8/0239Y02E60/50
Inventor 赵丽娜肖伟刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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