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Electrode material for all-vanadium redox flow battery and preparation method thereof

An all-vanadium redox flow battery and electrode material technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as battery performance constraints, reduced battery performance, and high resistivity, so as to improve electrochemical reversibility and improve performance Effect

Inactive Publication Date: 2012-07-11
SHIJIAZHUANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the cost of metal electrodes is too high, their reversibility is poor, and they are prone to passivation after long-term use, which reduces battery performance; while composite conductive plastic electrodes have relatively high resistivity; carbon electrodes are relatively cheap, have a long service life, and have high reliability. The use and maintenance costs are lower, but its reversibility is still poor, so the battery performance is restricted

Method used

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  • Electrode material for all-vanadium redox flow battery and preparation method thereof
  • Electrode material for all-vanadium redox flow battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The electrode material for the all-vanadium redox flow battery is prepared by the following method.

[0017] (1) Heat acetylene black to 800°C at a heating rate of 5°C / min in a heating device and keep it warm for 2 hours. After cooling to room temperature naturally, wash, filter and dry with distilled water.

[0018] (2) Add 1.4g Na 2 WO 4 2H 2 O was dissolved in 14mL water, and a sodium tungstate solution with a mass concentration of 9% was prepared, and 1g of oxidized acetylene black was added (the molar ratio of sodium tungstate and acetylene black was 0.05:1). Add 16mL of 4mol / L hydrochloric acid dropwise at a speed of 1 / min, the pH of the solution is 1, after all the hydrochloric acid is added, continue to stir for 0.5h, then stand and age at room temperature for 12 hours, then perform suction filtration, washing, and drying.

[0019] (3) Then put it into the muffle furnace and raise the temperature to 500°C at a heating rate of 5°C / min and keep it...

Embodiment 2

[0020] Example 2: The electrode material for the all-vanadium redox flow battery is prepared by the following method.

[0021] (1) Heat acetylene black to 700°C at a heating rate of 2°C / min in a heating device and keep it warm for 2 hours. After cooling to room temperature naturally, wash, filter and dry with distilled water.

[0022] (2) Add 1.4g Na 2 WO 4 2H 2 O was dissolved in 14mL of water to prepare a sodium tungstate solution with a mass concentration of 9%, and 1g of oxidized acetylene black was added (the molar ratio of sodium tungstate and acetylene black was 0.05:1). Add 16 mL of 3 mol / L hydrochloric acid dropwise at a speed of 1 / min, the pH of the solution is 1, after adding all the hydrochloric acid, continue to stir for 2 hours, leave it to stand at room temperature for 24 hours, then carry out suction filtration, washing, and drying.

[0023] (3) Then put it into the muffle furnace and raise the temperature to 400°C at a heating rate of 8°C / min and keep it fo...

Embodiment 3

[0024] Embodiment 3: The electrode material for the all-vanadium redox flow battery is prepared by the following method.

[0025] (1) Heat acetylene black to 600°C at a heating rate of 10°C / min in a heating device and keep it warm for 1.5h. After cooling to room temperature naturally, wash, filter and dry with distilled water.

[0026] (2) Add 2.8g Na 2 WO 4 2H 2 O was dissolved in 16mL of water to prepare a sodium tungstate solution with a mass concentration of 14.9%. Add 1g of oxidized acetylene black (the molar ratio of sodium tungstate to acetylene black was 0.1:1), and under magnetic stirring, 3mL Add 12mL of 4mol / L hydrochloric acid dropwise at a speed of 1 / min, the solution pH=2, after adding all the hydrochloric acid, continue to stir for 4h, leave to stand and age at room temperature for 8 hours, then carry out suction filtration, washing, and drying.

[0027] (3) Put it into a muffle furnace and raise the temperature to 200°C at a rate of 2°C / min and keep it warm ...

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Abstract

The invention discloses an electrode material for an all-vanadium redox flow battery and a preparation method thereof. The preparation method comprises the following steps of: (1) oxidation treatment of acetylene black: carrying out oxidation treatment on acetylene black by use of air or an oxidant; (2) adsorption of tungstic acid by acetylene black: adding oxidized acetylene black into a solution containing tungstate ions, adding an acid liquid to adjust the pH value to acidity, separating out and adsorbing the tungstic acid on the surface of acetylene black, and aging at room temperature, filtering, washing and drying; and (3) calcination: calcining acetylene black adsorbing tungstic acid, and grinding to obtain the acetylene black supported tungstic oxide electrode material. In the method, oxidation treatment is carried out on acetylene black and then tungsten oxide covers on the surface of acetylene black so as to improve the electrochemical reversibility of acetylene black on the redox couple of the all-vanadium redox flow battery.

Description

technical field [0001] The invention relates to an electrode material for a battery and a preparation method thereof, in particular to an electrode material for an all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] All-vanadium redox flow battery due to VO in the electrolyte 2 + The strong oxidation of sulfuric acid and the strong acidity of sulfuric acid, as the electrode material of vanadium battery must have the characteristics of good electrochemical activity, resistance to strong oxidation and strong acidity, good electrical conductivity and high mechanical strength. So far, the electrode materials used mainly include metal electrodes represented by gold, lead, titanium, titanium-based platinum and iridium oxide DSA, carbon electrodes represented by graphite felt, carbon felt and graphite-carbon composite materials, and composite electrodes. Conductive plastic electrodes. Studies have shown that the cost of metal electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38
CPCY02E60/12Y02E60/10
Inventor 吕立强吴建军段书德朱珠靳素景
Owner SHIJIAZHUANG UNIVERSITY
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