Treatment method for all-vanadium redox flow battery electrode

The technology of an all-vanadium redox flow battery and a processing method is applied in the field of treatment of electrodes for all-vanadium redox flow batteries, and can solve the problems of catalyst falling off, increasing the specific surface area of ​​carbon electrodes, electrochemical reaction active sites, and reducing reaction activity. , to achieve the effects of low cost, increased effective reaction area and simple operation

Inactive Publication Date: 2016-04-27
HUNAN YINFENG NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention provides a treatment method for the electrodes of all-vanadium redox flow batteries, that is, the carbon electrodes are treated with high-temperature alkali to increase the specific surface area of ​​the carbon electrodes and the active sites of electrochemical reactions, so as to overcome the problems caused by the long-term operation. Disadvantages of detachment of catalyst and decrease in reactivity

Method used

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  • Treatment method for all-vanadium redox flow battery electrode
  • Treatment method for all-vanadium redox flow battery electrode
  • Treatment method for all-vanadium redox flow battery electrode

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Embodiment 1

[0026] Dissolve 0.1 g of analytically pure KOH in distilled water, soak a 6 mm thick carbon felt in the above solution and ultrasonically soak for 30 minutes, take out the carbon felt and dry it in a muffle furnace at 80°C for 6 hours. The carbon felt dried in the muffle furnace was placed in a tube furnace, and under the protection of nitrogen, the temperature was raised to 700 °C at a rate of 10 °C / min, the activation reaction was kept for 20 min, and then naturally cooled to room temperature. Take out the high-temperature activated carbon felt and place it in a 150ml beaker, add 100mL of 1.0mol / L HCl, and ultrasonically wash it for 30min. After pouring out the solution, add 100mL distilled water, ultrasonically wash for 10min, and ultrasonically change and wash with distilled water 5 times until the pH value of the solution is neutral, soak in 200ml distilled water for 24h, then take out the carbon felt and place it in a muffle furnace for 12h at 80°C , to obtain an electro...

Embodiment 2

[0028] Dissolve 0.5 g of analytically pure KOH in distilled water, soak a carbon felt with a thickness of 5 mm in the above solution for 60 minutes, and take out the carbon felt and dry it in a vacuum oven at 100°C for 6 hours. The carbon felt dried in a vacuum drying oven was placed in a tube furnace, and under the protection of nitrogen, the temperature was raised to 800 °C at a rate of 8 °C / min, the activation reaction was kept for 30 min, and naturally cooled to room temperature. Take out the high-temperature activated carbon felt and place it in a 150ml beaker, add 100mL of 1.0mol / L HCl, and ultrasonically wash it for 30min. After pouring out the solution, add 100mL distilled water, ultrasonically wash for 10min, change and wash 5 times with distilled water ultrasonically until the pH value of the solution is neutral, soak in 200ml distilled water for 24h, then take out the carbon felt and place it in a vacuum drying oven for 12h at 100°C , to obtain an electrode that can...

Embodiment 3

[0030] Dissolve 1.0 g of analytically pure KOH in distilled water, soak graphite felt with a thickness of 6 mm in the above solution for 90 minutes, and then take out the graphite felt and dry it in a muffle furnace at 100°C for 6 hours. The graphite felt dried in the muffle furnace was placed in a tube furnace, and under the protection of argon, the temperature was raised to 900°C at a rate of 10°C / min, kept for 30 minutes for activation reaction, and then naturally cooled to room temperature. Take out the high-temperature activated graphite felt and place it in a 150ml beaker, add 100mL of 1.0mol / L HCl, and ultrasonically wash it for 30min. After pouring out the solution, add 100mL distilled water, ultrasonically wash for 10min, change and wash 5 times with distilled water ultrasonically until the pH value of the solution is neutral, soak in 200ml distilled water for 24h, then take out the graphite felt and place it in a vacuum drying oven for 12h at 100°C , to obtain an ele...

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Abstract

The invention provides a treatment method for an all-vanadium redox flow battery electrode. The method comprises the following steps: with carbon electrode materials of a graphite felt, a carbon felt and the like as raw materials, drying the raw materials after fully soaking in an alkali liquor; carrying out high-temperature activation under protection of an inert gas; and washing and drying the product to prepare the activated carbon electrode materials. The treatment method has the advantages of being simple, simple and convenient to operate and low in cost; the surfaces of the treated carbon electrode materials are etched; the effective reaction area of vanadium ion electron pairs on the electrode surface is increased; the charge transfer impedance of an all-vanadium redox flow battery in a charge-discharge process is greatly reduced, so that the voltage efficiency and the energy efficiency of the all-vanadium redox flow battery under high current density are greatly improved.

Description

technical field [0001] The invention relates to an electrode material for an all-vanadium redox flow battery, in particular to a treatment method for an electrode for an all-vanadium redox flow battery. Background technique [0002] The all-vanadium redox flow battery is a secondary battery that uses vanadium ion solutions in different valence states as the positive and negative electrode active materials, and uses the electrochemical redox reaction between vanadium ions in different valence states to store and release energy. It is characterized by a long service life , low cost, simple maintenance, deep discharge, environmentally friendly, especially its energy capacity and power output can be separated. Therefore, vanadium flow battery (VFB) is considered to be one of the most promising large-scale energy storage technologies. [0003] All-vanadium redox flow batteries often use carbon materials such as graphite felt, carbon felt, carbon cloth, and carbon paper as electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/18
CPCH01M4/88H01M8/18Y02E60/50
Inventor 吴雄伟刘俊黄鹏张洁吴雪文尹新荣萧荣滔吕善光
Owner HUNAN YINFENG NEW ENERGY
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