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Method for preparing electrode material for all-vanadium flow battery

A technology for all-vanadium redox flow batteries and electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of transition metal oxides that cannot exist stably for a long time, easy to damage the physical properties of carbon fibers, and limited specific surface area of ​​carbon fibers. The experimental conditions are easy to meet, the electrode reaction area is enlarged, and the price is low.

Inactive Publication Date: 2012-06-27
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, the activity of the vanadium battery electrode reaction on its surface is relatively low, so it needs to be activated to improve the electrochemical activity and battery performance.
[0004] At present, there are many modification methods for carbon felt or graphite felt electrode materials, including liquid phase oxidation treatment, thermal oxidation treatment in atmosphere or transition metal oxide modification, but these methods are very limited for improving the specific surface area of ​​carbon fibers , and it is easy to damage the physical properties of carbon fiber
The transition metal oxides modified on carbon fibers cannot exist stably on the surface for a long time, and the catalytic performance is unstable

Method used

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  • Method for preparing electrode material for all-vanadium flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Add polyacrylonitrile with a mass fraction of 10% to nitrogen and nitrogen dimethylformamide under stirring conditions, and stir for 2 hours at a water bath temperature of 60° C. to obtain a composite spinning solution. The average molecular weight of polyacrylonitrile is 150,000 .

[0033] 2) Add multi-walled carbon nanotubes with a mass fraction of 5% (relative to the amount of polyacrylonitrile) into the spinning solution in step 1), and stir for 12 hours to obtain a uniformly mixed spinning solution.

[0034] 3) Add the mixed spinning solution through step 2) into a 20ml syringe, the diameter of the pinhole is 1.0mm, the distance between the pinhole and the current collector is 12cm, the voltage between the two is 20kV, and the current collector is 200 microns thick Carbon paper with an injection rate of 0.5 ml / hour.

[0035] 4) Put the electrode precursor material obtained in step 3) into a vacuum / atmosphere furnace, the pre-oxidation temperature is 300°C, the ...

Embodiment 2

[0039] The difference with Example 1 is:

[0040] 1) Polyethylene glycol with a mass fraction of 10% is added to nitrogen and nitrogen dimethylformamide under stirring conditions, and the water bath temperature is 40°C and stirred for 3 hours to obtain a composite spinning solution. The average molecular weight of polyethylene glycol for 8000.

[0041] 2) Graphite oxide with a mass fraction of 5% (relative to the amount of polyethylene glycol) was added to the spinning solution in step 1), and stirred for 12 hours to obtain a uniformly mixed spinning solution.

[0042] 3) Add the mixed spinning solution through step 2) into a 20ml syringe, the diameter of the pinhole is 0.7mm, the distance between the pinhole and the current collector is 15cm, the voltage between them is 30kV, and the current collector is 200 microns thick Carbon paper with an injection rate of 0.5 ml / hour.

[0043] 4) Put the electrode precursor material obtained in step 3) into a vacuum / atmosphere furnace,...

Embodiment 3

[0047] The difference with Example 1 is:

[0048] 1) Add polyacrylonitrile with a mass fraction of 20% to nitrogen and nitrogen dimethylformamide under stirring conditions, and stir for 5 hours at a water bath temperature of 50° C. to obtain a composite spinning solution. The average molecular weight of polyacrylonitrile is 100,000 .

[0049] 2) Add multi-walled carbon nanotubes with a mass fraction of 3% (relative to the amount of polyacrylonitrile) into the spinning solution in step 1), and stir for 10 hours to obtain a uniformly mixed spinning solution.

[0050] 3) Add the mixed spinning solution through step 2) into a 40ml syringe, the diameter of the pinhole is 1.0mm, the distance between the pinhole and the current collector is 10cm, the voltage between them is 35kV, and the current collector is 200 microns thick Carbon paper with an injection rate of 1 ml / hr.

[0051] 4) Put the electrode precursor material obtained in step 3) into a vacuum / atmosphere furnace, the pre...

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Abstract

The invention relates to the field of cell manufacturing and energy storage, and concretely relates to a method for preparing an electrode material for an all-vanadium flow battery. The method comprises the following steps: preparing a composite spinning liquid needed by experiments, uniformly mixing carbon nanotubes with the electrode catalysis, graphite oxide, a transition metal oxide or a transition metal nitrate or halide, and the like with the composite spinning liquid, preparing a raw electrode material through a static spinning process, preoxidizing an electrode material precursor (the raw electrode material) through utilizing a vacuum / atmosphere furnace (at 200-500DEG C), and carbonizing in an inert atmosphere (at 800-1500DEG C) to obtain the needed electrode material. The obtained electrode material can be subjected to charge and discharge tests of the cell after cleaning and drying. According to the vanadium cell electrode material prepared through adopting the method of the invention, the carbon fiber diameter is in the nanometer level, the specific surface area is substantially higher than specific surface areas of traditional used electrode materials, and the oxygen content of the fiber surface is greatly improved because of the late preoxidation processing.

Description

technical field [0001] The invention relates to the field of battery manufacturing and energy storage, in particular to a method for preparing an electrode material for an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery (vanadium battery) is a new type of secondary battery that utilizes the chemical changes in different valence states of vanadium ions to store energy. Liquid phase greatly reduces electrode polarization, its rated power and rated capacity are independent, instantaneous charging can be achieved by replacing the electrolyte, and 100% deep discharge will not damage the battery, etc. Based on the above advantages , which can be widely used in wind energy, solar energy and other energy storage, power grid peak regulation, uninterruptible power supply, etc. [0003] At present, the electrode materials used in vanadium batteries are mainly carbon-based graphite felt or carbon felt, which has the advantages of low resis...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 刘建国李文跃严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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