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Preparation method of integrated electrode and vanadium redox flow battery

A vanadium redox flow battery and electrode technology, which is applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of weak mixing ability, large plate resistance, and large production capacity, and achieve the reduction of overall resistance value and contact resistance. Effect

Inactive Publication Date: 2019-12-27
BEIJING PRUDENT CENTURY TECH CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There are two main processing techniques for polymer composite bipolar plates: 1) hot pressing process: first mix the polymer powder and conductive filler evenly, fill it into the mold, and press the plate with a suitable size through the hot pressing process ; This process is simple to operate, but it is a batch production process with limited production capacity and weak mixing ability; 2) Banbury extrusion process: After mixing the polymer powder and conductive filler evenly, put it into the banbury mixer or twin-screw Mixing in the extruder, and then extruding through rolling rollers to obtain bipolar plate materials of suitable thickness and size; this process has a large capacity and is suitable for mass production. The polymer mixing ability is strong, but the disadvantage is the filling amount of conductive fillers There are restrictions, too small filling will cause the resistance of the plate to be too large, and too much filling will cause great difficulty in processing

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  • Preparation method of integrated electrode and vanadium redox flow battery

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preparation example Construction

[0031] In view of the current problem that the physical contact between the bipolar plate and the carbon felt increases the overall resistance value, the embodiment of the present invention discloses a method for preparing an integrated electrode. The integrated electrode prepared by this method can reduce the overall resistance value, and at the same time It has good mechanical strength, corrosion resistance and liquid resistance. Specifically, the application provides a method for preparing an integrated electrode, comprising the following steps:

[0032] A) preparing a polymer composite bipolar plate;

[0033] B) placing the polymer composite material bipolar plate between two carbon felts, and hot pressing to obtain an integrated electrode;

[0034] The preparation method of the polymer composite bipolar plate includes:

[0035] A1) mixing the polymer resin and carbon powder, extruding the obtained mixture to obtain a polymer composite material bipolar plate;

[0036] O...

Embodiment 1

[0044] According to the mass ratio of polyethylene: carbon black = 70: 30, weigh it and put it into the mixer for mixing to obtain the mixture powder of polymer and carbon black; put the mixture powder into the twin-screw extruder to extrude The sheet is calendered into a bipolar plate with a thickness of 0.6 mm, a length of 600 mm, and a width of 500 mm.

[0045] Place the bipolar plate between two carbon felts of the same size and thickness of 6 mm, and hot press in the mold for 30 minutes, the clamping pressure is 40 MPa, and the temperature is 220 ° C. After cooling, the mold is opened to obtain an integrated electrode .

[0046] The performance of the above-mentioned integrated electrode was tested, and the thickness of the carbon felt on both sides was measured to be 5.8mm, and the electrode resistivity was 6.0Ω·cm; the integrated electrode was used to assemble an all-vanadium redox flow battery, and the voltage of the all-vanadium redox flow battery The efficiency reac...

Embodiment 2

[0048] According to the mass ratio of polypropylene: graphite = 70: 30, weigh and put it into the mixer for mixing to obtain the mixture powder of polymer and graphite; put the mixture powder into the twin-screw extruder to extrude the sheet , rolled into a bipolar plate with a thickness of 0.8mm, a length of 600mm, and a width of 500mm;

[0049] Place the bipolar plate between two carbon felts of the same size and thickness of 6 mm, and hot press in the mold for 30 minutes, the clamping pressure is 40 MPa, and the temperature is 220 ° C. After cooling, the mold is opened to obtain an integrated electrode .

[0050] The performance of the above-mentioned integrated electrode was tested, and the thickness of the carbon felt on both sides was measured to be 5.7mm, and the electrode resistivity was 7.1Ω·cm; this integrated electrode was used to assemble an all-vanadium redox flow battery, and the voltage of the all-vanadium redox flow battery The efficiency reached 83%, and the ...

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Abstract

The invention provides a preparation method of an integrated electrode for a vanadium redox flow battery. The method comprises steps of A) preparing a polymer composite bipolar plate; and B) placing the polymer composite material bipolar plate between two carbon felts, and carrying out hot pressing to obtain the integrated electrode. The polymer composite material bipolar plate and the carbon felts are integrated into the integrated electrode, and one part of the carbon felt is fused into the polymer composite material bipolar plate, so the contact resistance is greatly reduced, the power consumption of the battery on the electrode is reduced, and efficiency of the battery is improved; in addition, the integrated electrode further has high mechanical strength, good corrosion resistance andgood liquid resistance.

Description

technical field [0001] The invention relates to the technical field of bipolar plates, in particular to a method for preparing an integrated electrode and a vanadium redox flow battery. Background technique [0002] The electrode of the vanadium redox flow battery is composed of a bipolar plate and a carbon felt. The function of the bipolar plate is to conduct current and separate the positive and negative electrolytes. Import or export. Among them, bipolar plates need to have the following characteristics: 1) Corrosion resistance: aging, cracking, and performance attenuation cannot occur in highly corrosive electrolytes; 2) Small resistivity: excessive resistivity will increase battery life. 3) Good liquid resistance: the bipolar plate should separate the positive and negative electrolytes, and the electrolyte cannot pass through the plates, otherwise the mixed liquid will reduce the current efficiency; the carbon felt needs to have the following characteristics: 1 ) Corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86
CPCH01M4/86H01M4/88H01M8/188Y02E60/50
Inventor 李铎黄绵延
Owner BEIJING PRUDENT CENTURY TECH CO LTD
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