A kind of continuous preparation method of porous composite ionic membrane

A composite ion and ion membrane technology, applied in the field of all-vanadium redox flow batteries, can solve the problems of high vanadium ion permeability of perfluorosulfonic acid proton exchange membrane and low production efficiency of diaphragm preparation process, and achieve good ion selection Permeability, good electrical conductivity, cost reduction effect

Active Publication Date: 2022-04-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In order to solve the problems of high vanadium ion permeability of the perfluorosulfonic acid proton exchange membrane currently used and low production efficiency of the domestic diaphragm preparation process, the purpose of the present invention is to provide a continuous preparation method for a porous composite ion membrane. Composite membrane has simple process, high production efficiency, continuous production, low price, and can be applied to all-vanadium redox flow battery (VRB)

Method used

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  • A kind of continuous preparation method of porous composite ionic membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Dissolve 12kg of perfluorosulfonic acid resin and 2.6g of polybenzimidazole resin in dimethylacetamide (DMAC), heat and stir at 200°C for 5-8 hours to form a gel, add dibutyl phthalate Add 180mL of ester into the gel mixture, stir for 3.5 hours and vibrate in an ultrasonic oscillator for 1h~2h to refine the solution and drive out the tiny bubbles in it, put the gel mixture into the extruder, and pass through the mill Mushroom is extruded at 180°C, and then the film is cooled in three temperature sections of 180-200°C, 100-140°C, and 60-80°C in sequence. The treatment time of each temperature section is 0.5h, and the film after cooling treatment enters Extraction is carried out in a mixed extractant of ethanol and water, the membrane is taken out and washed with deionized water, the ion exchange membrane is dried at 70-90°C, and the dried membrane is hot-pressed to obtain a porous ion-exchange composite membrane.

[0030] The relevant performance data of the present embo...

Embodiment 2

[0033]Dissolve 12kg of perfluorosulfonic acid resin and 2.6g of polyvinylidene fluoride resin in dimethylacetamide (DMAC), heat and stir at 200°C for 5-8 hours to form a gel, and add 180mL of polyvinylpyrrolidone to the In the gel-like mixture, stir for 4 hours and vibrate in an ultrasonic oscillator for 1h-2h to refine the solution and drive out the tiny bubbles in it, put the gel-like mixture into the extruder and extrude through the mold at 180°C After forming, the film enters three temperature sections of 180-200°C, 100-140°C, and 60-80°C for cooling treatment. The treatment time of each temperature section is 0.5h, and the film after cooling treatment enters the mixed solution of ethanol and water Extraction is carried out, the membrane is taken out and washed with deionized water, and the ion exchange membrane is dried at 70-90° C., and the dried membrane is hot-pressed and wound to obtain a porous ion-exchange composite membrane.

[0034] The relevant performance data o...

Embodiment 3

[0037] Dissolve 12kg of perfluorosulfonic acid resin and 2.6g of polyvinylidene fluoride resin in dimethylacetamide (DMAC), heat and stir at 200°C for 5-8 hours to form a gel, and add 180mL of polyvinyl alcohol PVA Put it into the gel-like mixture, stir for 3 hours and vibrate in an ultrasonic oscillator for 1h~2h to refine the solution and drive out the tiny bubbles in it, put the gel-like mixture into the extruder and pass through the mold at 180°C Extrusion molding, and then the film is sequentially entered into three temperature sections of 180-200°C, 100-140°C, and 60-80°C for cooling treatment. The treatment time of each temperature section is 0.5h. Extraction is carried out in a mixed extractant, the membrane is taken out and washed with deionized water, and the ion exchange membrane is dried at 70-90° C., and the dried membrane is hot-pressed and wound to obtain a porous ion-exchange composite membrane.

[0038] The relevant performance data of the present embodiment a...

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Abstract

The invention discloses a continuous preparation method of a porous composite ion membrane, belonging to the technical field of all-vanadium redox flow batteries. The method uses perfluorosulfonic acid resin with good chemical stability as the main film material, adds polymers and additives with different functions, puts it into the hopper of the extruder for melting and plasticization, and extrudes the formed film into several The temperature is lowered in each temperature section, and the temperature is gradually decreased from high to low. The cooled film enters the extraction solution for extraction, and the additives are extracted to form pores. Finally, the extracted film is washed in deionized water and wound into a film. A porous composite ion membrane is obtained. The continuous preparation process of the ion composite membrane in 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 can be applied to all-vanadium redox solutions The flow battery (VRB) is simple to operate and has low requirements for equipment and operators.

Description

technical field [0001] The invention relates to the technical field of vanadium redox flow battery (VRB), in particular to a continuous preparation method of a porous composite ion membrane, and the prepared porous composite ion membrane is used in an all vanadium redox flow battery. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1018H01M8/1069H01M8/18
CPCH01M8/1018H01M8/1069H01M8/188Y02E60/50
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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