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Ion liquid reinforced film for vanadium ion redox flow battery and preparation method thereof

An all-vanadium redox flow battery, ionic liquid technology, applied in fuel cells, battery pack components, fuel cell components, etc. Stable performance, improved energy efficiency and good electrochemical activity

Inactive Publication Date: 2012-05-02
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

[0004] In view of the above problems, the present invention proposes an ionic liquid enhanced membrane for all-vanadium redox flow batteries and its preparation method, which solves the problem of low vanadium resistance of perfluorosulfonic acid, partial perfluorosulfonic acid and non-fluorine diaphragms in the prior art. , affecting the battery performance of vanadium batteries and other issues

Method used

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  • Ion liquid reinforced film for vanadium ion redox flow battery and preparation method thereof
  • Ion liquid reinforced film for vanadium ion redox flow battery and preparation method thereof
  • Ion liquid reinforced film for vanadium ion redox flow battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, the preparation method of the composite proton exchange membrane for the enhanced vanadium battery is as follows:

[0026] (1) Weigh a certain amount of perfluorosulfonic acid resin and dissolve it in nitrogen and nitrogen dimethylformamide (N,N-dimethylformamide) by stirring, and configure it into a matrix with a weight concentration of 40g / L Film-forming solution, then get 0.35g 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid and join in 80ml film-forming liquid (the weight percent of ionic liquid is 10%), by stirring 1 hour, then ultrasonic 30 Minutes to disperse the ionic liquid evenly.

[0027] (2) The dispersed solution was poured onto the pre-leveled flat glass, and after drying at 140°C for 2 hours, the enhanced proton exchange membrane was prepared and assembled into a battery for battery performance testing. In this embodiment, the thickness of the enhanced proton exchange membrane is 90 microns. The composition of the exchan...

Embodiment 2

[0030] The difference from Example 1 is that in this example, the preparation method of the proton exchange membrane for the ionic liquid enhanced vanadium battery is as follows:

[0031] (1) Weigh a certain amount of perfluorosulfonic acid resin and dissolve it in dimethyl sulfoxide by stirring, configure it as a matrix film-forming solution with a weight concentration of 40g / L, and then take 0.105g of 1-butyl-3 - Methylimidazolium hexafluorophosphate ionic liquid was added to 80ml of film-forming liquid (the weight percentage of ionic liquid was 3%), and the ionic liquid was uniformly dispersed by stirring for 30 minutes and then ultrasonication for 10 minutes.

[0032] (2) The dispersed solution was poured onto the pre-leveled flat glass, and after drying at 140°C for 3 hours, the enhanced proton exchange membrane was prepared and assembled into a battery for battery performance testing. In this embodiment, the thickness of the enhanced proton exchange membrane is 80 micron...

Embodiment 3

[0036] The difference from Example 1 is that in this example, the preparation method of the ion-exchange membrane for the enhanced vanadium battery is as follows:

[0037] (1) Weigh a certain amount of sulfonated polyether ether ketone and dissolve it in dimethyl sulfoxide by stirring, and configure it into a matrix film-forming solution with a weight concentration of 60g / L, and then take 0.96g of 1-butyl- The ionic liquid of 3-methylimidazolium hexafluorophosphate was added to 80ml of the film-forming liquid (the weight percentage of the ionic liquid was 20%), and the ionic liquid was uniformly dispersed by stirring for 2 hours and then ultrasonicating for 20 minutes.

[0038](2) The dispersed solution was poured onto the pre-leveled flat glass, and after drying at 140°C for 3 hours, the enhanced proton exchange membrane was prepared and assembled into a battery for battery performance testing. In this embodiment, the thickness of the enhanced proton exchange membrane is 120 ...

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Abstract

The invention relates to the field of battery manufacturing and energy storage, in particular to an ion liquid reinforced film for vanadium ion redox flow battery and a preparation method thereof, aiming to solve the problems that the diaphragm vanadium resistant performance for all fluorinated, partial fluorinated and non-fluorine vanadium battery is low and the battery performance of vanadium battery is influenced. The ion liquid reinforced film for the vanadium ion redox flow battery comprises the following components in percentage by weight: 80-90 percent of film forming matrix macromolecular material and 1-20 percent of ion liquid, wherein the sum of the weight of the film forming matrix macromolecular material and the ion liquid is 100%. The method comprises the following steps of dissolving the film forming matrix macromolecular material in organic solvent, dispersing the ion liquid in the film forming matrix solution through agitating and ultrasonic ways, and preparing a reinforced compound film material through solution evaporating and molding by casting in a plane. According to the method provided by the invention, repellency is doped in the matrix film material, and the vanadium resistant property of the film material is strengthened through ion liquid with higher conductivity, so that the reduction of battery performance caused by vanadium ion penetration and migration can be effectively inhibited, and the energy storage efficiency of the battery can be improved.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to an ionic liquid enhanced membrane for an all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] All-vanadium redox flow battery (vanadium battery) is a secondary energy system that uses redox reactions between vanadium ions in different valence states to store and convert energy. Its characteristics are: positive and negative active materials are sulfuric acid solution of vanadyl sulfate, no cross-contamination of electrolyte, rated power and capacity are independent, 100% deep discharge can be performed without damaging the battery, and the battery can achieve instant regeneration Charge, unlimited theoretical shelf life, etc. As an energy storage power source, vanadium batteries are mainly used in power station peak regulation, large-scale photoelectric conversion, energy storage power for wind power generation, ...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16H01M8/0297
CPCY02E60/12Y02E60/50
Inventor 刘建国李文跃严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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