A kind of preparation method of composite film

A composite membrane and polymer technology, applied in fuel cells, electrical components, electrochemical generators, 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 good ion selective permeability, good electrical conductivity, and reduce swelling

Active Publication Date: 2022-05-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of composite film

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Experimental program
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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 role is to control the volatilization speed of the solvent and the leaching speed of the extractant). Enter the deionized water for washing, put the ion exchange membrane into the dryin...

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, which belongs to the field of ion membrane preparation. Use perfluorosulfonic acid resin with good chemical stability as the main membrane material, mix polymers with different functions, dissolve the resin through organic solvents to obtain slurry, add additives, mix uniformly to form a gel material; put the gel material into Extruded in the extruder, the formed film is put into the environment of different temperature ranges, and the different temperature ranges are gradually reduced from high to low, and the film after gradient heat treatment enters the extraction agent for extraction, takes out the film and washes it in deionized water, heat Roll calendering and winding to obtain a porous ion exchange composite membrane. The continuous preparation process of the composite membrane of the present invention is simple, and the prepared membrane has low swelling, good dimensional stability, high mechanical strength, low vanadium ion permeability, good chemical and thermal stability, and is suitable for all-vanadium redox flow batteries. The operation is simple, and the requirements for equipment and operators are not high.

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 Patents(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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