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Preparation method of integrated composite membrane for all vanadium redox flow batteries

An all-vanadium redox flow battery and composite membrane technology, which is applied in fuel cells, electrochemical generators, regenerative fuel cells, etc., can solve the problems of grid power and frequency impact, difficult to use all-weather, etc., to reduce internal resistance and improve battery performance. Efficiency, the effect of promoting tight integration

Active Publication Date: 2018-08-28
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, subject to time and geographical dependence, off-grid wind and solar power generation must use energy storage systems, otherwise it is difficult to use all-weather; and directly connected to the grid must also use energy storage systems to adjust the peak and frequency of the grid, otherwise it will affect the power grid. Power and frequency bring a big impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the preparation method of an integrated composite membrane for an all-vanadium redox flow battery, the specific steps are as follows:

[0027] 1. Dissolve 3g of perfluorosulfonic acid resin in N,N-dimethylformamide (DMF), heat and dissolve in an autoclave to prepare a 5% perfluorosulfonic acid resin solution, and heat to dissolve The temperature condition was 220°C.

[0028] 2. Ultrasonicate the solution obtained in step 1 for 1 h to remove air bubbles and impurities.

[0029] 3. Using the solution casting method, cast 50 mL of the perfluorosulfonic acid resin solution in step 2 on a glass plate, dry at 140° C. for 2 hours and volatilize to form a film. The thickness of the perfluorosulfonic acid resin film is 40 μm.

[0030] 4. Use a perfluorosulfonic acid resin solution (Nafion solution) with a mass fraction of 3% as a binder, and compound it on the surface of the membrane by casting;

[0031] 5. The electrode and the separator with the adhesive ...

Embodiment 2

[0034] The difference from Example 1 is:

[0035] 1. When the solvent is not completely dry in step 4, the Nafion solution with a mass fraction of 5% is used as a binder to compound it on the surface of the membrane by spraying;

[0036] 2. The remaining steps are the same as in Example 1.

[0037] In this embodiment, the interfaces of the obtained membrane electrodes are in good contact, and there is no separation phenomenon.

Embodiment 3

[0039] The difference from Example 1 is:

[0040] 1. When the solvent is not completely dry in step 4, mix the Nafion solution with a mass fraction of 7% and the tungsten phosphate ethanol solution with a mass concentration of 0.15%. The mass ratio of tungsten phosphate to Nafion is 1:20. The binder is compounded onto the surface of the membrane by casting;

[0041] 2. The remaining steps are the same as in Example 1.

[0042] In this embodiment, the interfaces of the obtained membrane electrodes are in good contact, and there is no separation phenomenon.

[0043] Experimental results show that: the present invention adopts tape-casting method and spraying method to tightly combine electrodes and diaphragms together. The integrated composite diaphragm prepared by the invention has the advantages of good vanadium resistance performance, electrical conductivity, good battery performance, etc., reduces the internal resistance of the battery, meets the requirements for the use o...

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Abstract

The invention relates to the field of membrane electrodes for all vanadium redox flow batteries (VRB), particularly to a preparation method of an integrated composite membrane for all vanadium redox flow batteries. According to the present invention, the performances of the all vanadium redox flow batteries are determined by the voltage efficiency and the current efficiency, wherein the ohmic polarization can cause the voltage loss of the battery so as to affect the voltage efficiency; the integrated composite membrane is prepared by closely combining the electrode and the separation membraneso as to effectively reduce the internal resistance of the battery, reduce the polarization loss of the battery, and improve the performance of the VFB; and the prepared membrane electrode has advantages of good vanadium resistance, good mechanical performance and good electrical conductivity, can improve the performance of the single VRB battery, and can be used in the field of all vanadium redox flow batteries.

Description

technical field [0001] The invention relates to the field of membrane electrodes for all-vanadium redox flow batteries (VRB), in particular to a method for preparing an "integrated" composite membrane 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 use all-weather; and directly connected to the grid must also use energy storage systems to adjust the peak and frequency of the grid, otherwise it will affect the power grid. Power and frequency pack a big punch. Therefore, efficient and large-scale energy storage technology has become the key core of its development and application. [0003] Vanadium redox flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M8/18
CPCH01M8/1004H01M8/188Y02E60/50
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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