Preparation method of composite membrane with catalytic function for positive and negative electrodes used for all-vanadium redox flow batteries

An all-vanadium redox flow battery and composite membrane technology, applied in the field of composite membrane preparation, can solve problems such as difficulty in obtaining a proton conducting membrane with comprehensive properties, achieve good vanadium resistance performance, reduce the cost of energy storage systems, and improve vanadium battery performance. Effect

Active Publication Date: 2017-07-21
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

It can only meet the needs of some aspects of the battery, and it is difficult to obtain a proton conducting membrane with excellent comprehensive performance

Method used

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  • Preparation method of composite membrane with catalytic function for positive and negative electrodes used for all-vanadium redox flow batteries
  • Preparation method of composite membrane with catalytic function for positive and negative electrodes used for all-vanadium redox flow batteries
  • Preparation method of composite membrane with catalytic function for positive and negative electrodes used for all-vanadium redox flow batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, the specific steps are as follows:

[0028] 1. Dissolve 0.2g bismuth nitrate in 10mL N,N-dimethylformamide (DMF), stir and dissolve, and use it for the catalytic functional layer on the negative electrode side; dissolve 0.15g tungsten phosphate in 10mL N,N-dimethylformamide (DMF) Formamide (DMF), stirred and dissolved, used for the catalytic functional layer on the positive electrode side.

[0029] 2. Dissolve 4g of perfluorosulfonic acid resin in N,N-dimethylformamide (DMF), heat and dissolve in an autoclave to prepare a 6% perfluorosulfonic acid resin solution by mass, and heat to dissolve The temperature condition was 220°C.

[0030] 3. Ultrasonic treatment of the solution obtained in step (2) for 1 h to remove air bubbles and impurities.

[0031] 4. Using the solution casting method, cast 50 mL of the perfluorosulfonic acid resin solution in step (3) on a glass plate, dry at 120° C. for 2 hours and volatilize to form a film. The thickness of th...

Embodiment 2

[0037] The difference from Example 1 is:

[0038] 1. Dissolve 0.4g bismuth nitrate in 10mL N,N-dimethylformamide (DMF), stir and dissolve, and use it for the catalytic functional layer on the negative electrode side; dissolve 0.3g tungsten phosphate in 10mL N,N-dimethylformamide (DMF) Formamide (DMF), stirred and dissolved, used for the catalytic functional layer on the positive electrode side.

[0039] 2. The remaining steps are the same as in Example 1.

[0040] In this example, the thickness of the obtained composite film is 70 μm, and the interfaces in the composite film are in good contact, but the uniformity and flatness of the film surface are not very good.

Embodiment 3

[0042] The difference from Example 1 is:

[0043] 1. Dissolve 0.1g bismuth nitrate in 10mL N,N-dimethylformamide (DMF), stir and dissolve, and use it for the catalytic functional layer on the negative electrode side; dissolve 0.75g tungsten phosphate in 10mL N,N-dimethylformamide (DMF) Formamide (DMF), stirred and dissolved, used for the catalytic functional layer on the positive electrode side.

[0044] 2. The remaining steps are the same as in Example 1.

[0045] In this embodiment, the obtained composite film has a thickness of 55 μm, and the interfaces in the composite film are in good contact without any separation phenomenon.

[0046] The relevant performance data of the present embodiment are as follows:

[0047] It is measured at room temperature that the coulombic efficiency and energy efficiency of the composite film in the all-vanadium redox flow battery are lower than the data in Example 1 by about 2%. The analysis reason is that the catalytic layer is thinner and...

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Abstract

The invention relates to the field of ion exchange membranes used for all-vanadium redox flow batteries (VRB), and specifically discloses a preparation method of a composite membrane with a catalytic function for positive and negative electrodes used for the all-vanadium flow batteries. The membrane of a majority of all-vanadium flow batteries has the problem that the requirements, in some aspects, of the batteries can be met so that a proton conduction membrane with excellent overall performance is difficult to obtain, namely the problem is a balance problem between vanadium resistance and conductivity performance. Metal salt with an obvious catalytic function in reactions of the positive and negative electrodes is introduced into two sides of the membrane by adopting a step-by-step tape casting method, and the membrane has the catalytic function, so that the composite membrane with the catalytic function is prepared. The composite membrane prepared by the invention has good vanadium resistance performance, mechanical property and good single VRB battery performance, and the composite membrane can be widely applied to the field of the all-vanadium redox flow batteries.

Description

technical field [0001] The invention relates to the field of ion-exchange membranes for all-vanadium redox flow batteries (VRB), in particular to a method for preparing a composite membrane for all-vanadium redox flow batteries that has catalytic functions for positive and negative electrodes. 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 de...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
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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