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Polytetrafluoroethylene-based ion exchange membrane for vanadium batteries, and its making method

An ion exchange membrane, polytetrafluoroethylene technology, applied in battery electrodes, fuel cell parts, circuits, etc., can solve the problem of difficult control of content, achieve the effect of simple and easy method, improve mechanical strength, and inhibit permeation

Inactive Publication Date: 2015-02-04
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In CN101773793A, the Nafion film is soaked in the hydrolyzed solution of tetraethyl orthosilicate by sol-gel method, wherein nano-scale SiO 2 In situ grown in the Nafion film, the prepared composite film SiO 2 Evenly distributed, but SiO 2 The content is difficult to control and the membrane is intended for use in fuel cells rather than vanadium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare the mixed solution of 5% ethanol and water of Nafion resin according to the method described above, pipette an appropriate amount, and heat at 80 ° C for 10 h to obtain dry Nafion resin. After weighing, add a certain amount of Nafion resin to the dry resin N,N - Dimethylformamide (DMF) and heat at 80 °C to accelerate dissolution. Weigh nano-SiO 2 And control its ratio to Nafion dry resin to be 1:99 (mass ratio), add the above-mentioned Nafion resin to the DMF solution under ultrasonic stirring, and further ultrasonicate for 2 h to form a transparent and stable mixed solution.

[0020] Cut out a PTFE porous membrane with a thickness of 15 μm, soak it in absolute ethanol, and keep it at 55 °C for 2.5 h to improve the hydrophilicity of the PTFE membrane. Spread the treated film on a horizontal glass plate for later use.

[0021] The above Nafion resin and SiO 2 The DMF solution was cast on a polytetrafluoroethylene film, put into a drying oven at 80 °C for preli...

Embodiment 2

[0024] Prepare the mixed solution of 5% ethanol and water of Nafion resin according to the method described above, pipette an appropriate amount, and heat at 80 ° C for 10 h to obtain dry Nafion resin. After weighing, add a certain amount of Nafion resin to the dry resin N,N - Dimethylformamide (DMF) and heat at 80 °C to accelerate dissolution. Weigh nano-SiO 2 And control its ratio to Nafion dry resin to be 3:97 (mass ratio), add the above-mentioned Nafion resin DMF solution under ultrasonic stirring, and further ultrasonic 2 h to form a transparent and stable mixed solution.

[0025] Cut out a PTFE porous membrane with a thickness of 15 μm, soak it in absolute ethanol, and keep it at 55 °C for 2.5 h to improve the hydrophilicity of the PTFE membrane. Spread the treated film on a horizontal glass plate for later use.

[0026] The above Nafion resin and SiO 2 The DMF solution was cast on a polytetrafluoroethylene film, put into a drying oven at 80 °C for preliminary drying,...

Embodiment 3

[0029] Prepare the mixed solution of 5% ethanol and water of Nafion resin according to the method described above, pipette an appropriate amount, and heat at 80 ° C for 10 h to obtain dry Nafion resin. After weighing, add a certain amount of Nafion resin to the dry resin N,N - Dimethylformamide (DMF) and heat at 80 °C to accelerate dissolution. Weigh nano-SiO 2 And control its ratio to Nafion dry resin to be 5:95 (mass ratio), add the above-mentioned Nafion resin DMF solution under ultrasonic stirring, and further ultrasonic 2 h to form a transparent and stable mixed solution.

[0030] Cut out a PTFE porous membrane with a thickness of 15 μm, soak it in absolute ethanol, and keep it at 55 °C for 2.5 h to improve the hydrophilicity of the PTFE membrane. Spread the treated film on a horizontal glass plate for later use.

[0031] The above Nafion resin and SiO 2 The DMF solution was cast on a polytetrafluoroethylene film, put into a drying oven at 80 °C for preliminary drying,...

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Abstract

The invention relates to a making method of an ion exchange membrane composite membrane for all-vanadium redox flow batteries. The method comprises the following steps: immersing a high-molecular polymer polytetrafluoroethylene (PTFE) porous membrane in anhydrous ethanol to remove organic matters on the surface of the porous membrane; casting a perfluorosulfonate resin (Nafion) and nano-SiO2 mixed solution on the PEFE; and heating the obtained composite membrane in a common drying box in order to remove the above organic solvent, transferring to the vacuum drying box after the surface has no obvious flow, and drying to prepare the PEFE / Nafion / SiO2 composite membrane. The composite proton exchange membrane made in the invention has the characteristics of easy regulation of the thickness, low cost, simple operation, high proton conductivity, high vanadium resistance, and great reduction of the cost of diaphragms for the all-vanadium redox flow batteries.

Description

technical field [0001] The invention relates to an ion-exchange membrane composite membrane for an all-vanadium redox flow battery and a preparation method thereof, in particular to a polytetrafluoroethylene / perfluorosulfonic acid resin / nano-SiO 2 Composite membrane and method for its preparation. Background technique [0002] With the rapid increase in the production capacity of renewable resources in the world, energy storage technologies capable of stable and continuous output capacity urgently need to be developed. Among many energy storage technologies, the all-vanadium redox flow battery (vanadium battery) is recognized as a high-efficiency energy storage device, and has a flexible battery structure design, which can increase output power and energy storage capacity through the number of stacks and electrolyte capacity. Therefore, the all-vanadium redox flow battery has important development prospects in large-scale energy storage. [0003] The proton exchange membra...

Claims

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Application Information

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IPC IPC(8): H01M8/02C08J5/22
CPCH01M4/8875H01M4/94Y02E60/50Y02P70/50
Inventor 滕祥国戴纪翠毕方圆
Owner HARBIN INST OF TECH AT WEIHAI
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