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Processing method for improving activity of graphite felt electrode of vanadium battery

A technology of electrode activity and treatment method, which is applied in the field of vanadium batteries, can solve the problems of reduced battery life and electrode material stability, and achieves the effects of improving wettability, surface activity, and hydrophilicity

Active Publication Date: 2018-10-02
广州市泓能五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes an electrochemical treatment method for improving the activity of vanadium battery electrode materials, which overcomes the disadvantages of decreased stability of electrode materials and reduced battery life due to overoxidation of materials due to heat treatment and acid treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Place a polyacrylonitrile-based graphite felt with a thickness of 5 mm in absolute ethanol for ultrasonic cleaning, rinse and dry with deionized water.

[0036] (2) Put the graphite felt into a hydrogen peroxide solution with a mass fraction of 10% for modification treatment, and simultaneously heat the hydrogen peroxide solution to 60°C at a constant temperature for 2 hours, then take out the graphite felt and use a deionized Rinse with water and dry, of course, you can also put the graphite felt in an oven for drying.

[0037] (3) Soak the dried graphite felt in a hydrogen peroxide solution with a mass fraction of 10%, slowly add it into concentrated sulfuric acid at a volume ratio of 30% hydrogen peroxide, and treat for 2 hours.

[0038] (4) Since the graphite felt is immersed in the mixed solution of hydrogen peroxide and concentrated sulfuric acid, the graphite felt taken out after treatment contains impurities of hydrogen peroxide and concentrated sulfuric aci...

Embodiment 2

[0042] (1) Place a polyacrylonitrile-based graphite felt with a thickness of 5 mm in absolute ethanol for ultrasonic cleaning, rinse and dry with deionized water.

[0043] (2) Put the graphite felt into a hydrogen peroxide solution with a mass fraction of 20% for modification treatment, and simultaneously heat the hydrogen peroxide solution to 60°C at a constant temperature for 2 hours, then take out the graphite felt and use a deionized Rinse with water and dry, of course, you can also put the graphite felt in an oven for drying.

[0044] (3) Soak the dried graphite felt in a hydrogen peroxide solution with a mass fraction of 20%, slowly add it into concentrated sulfuric acid at a volume ratio of 30% hydrogen peroxide, and treat for 2 hours.

[0045] (4) Since the graphite felt is immersed in the mixed solution of hydrogen peroxide and concentrated sulfuric acid, the graphite felt taken out after treatment contains impurities of hydrogen peroxide and concentrated sulfuric aci...

Embodiment 3

[0049] (1) Place a polyacrylonitrile-based graphite felt with a thickness of 5 mm in absolute ethanol for ultrasonic cleaning, rinse and dry with deionized water.

[0050] (2) Put the graphite felt into a hydrogen peroxide solution with a mass fraction of 30% for modification treatment, and simultaneously heat the hydrogen peroxide solution to 100°C at a constant temperature for 2 hours, then take out the graphite felt and use a deionized Rinse with water and dry, of course, you can also put the graphite felt in an oven for drying.

[0051] (3) Immerse the dried graphite felt in a hydrogen peroxide solution with a mass fraction of 30%, slowly add it into concentrated sulfuric acid at a volume ratio of 30% hydrogen peroxide, and treat for 2 hours.

[0052] (4) Since the graphite felt is immersed in the mixed solution of hydrogen peroxide and concentrated sulfuric acid, the graphite felt taken out after treatment contains impurities of hydrogen peroxide and concentrated sulfuric...

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Abstract

The invention discloses a processing method for improving activity of a graphite felt electrode of a vanadium battery. The processing method comprises the following steps of (a) placing graphite feltin absolute ethyl alcohol for ultrasonic cleaning; (b) drying; (c) immersing the cleaned and dried graphite felt in a hydrogen peroxide solution, performing constant-temperature heating to 60-100 DEGC, heating for 1-8 hours and then drying; (d) impregnating the graphite felt dried in the step (c) in the hydrogen peroxide solution, slowly adding concentrated sulfuric acid according to a proportionthat hydrogen peroxide accounts for 10-30% of total volume, and processing for 1-8 hours; and (e) cleaning and drying the graphite felt after being processed in the step (d), wherein in the steps (c)and (d), the mass concentration of the hydrogen peroxide solution is 3-30%. By heating and pre-processing of hydrogen peroxide, the oxygen-containing functional group of the graphite felt is improved; and by immersing the graphite felt in the mixed solution of the hydrogen peroxide and the concentrated sulfuric acid, the oxygen-containing functional group of the graphite felt is remarkably improved, and the activity of the graphite felt electrode is further remarkably improved.

Description

technical field [0001] The invention belongs to the field of vanadium batteries, and in particular relates to a treatment method for improving the activity of graphite felt electrodes of vanadium batteries. Background technique [0002] All-vanadium redox flow battery (vanadium battery) is a secondary energy system that uses redox reactions between vanadium ions in different valence states to store and convert energy. Its characteristics are: no emission pollution, adjustable capacity, long cycle life, deep high current density discharge, fast charging, and high energy conversion rate. As an energy storage power source, vanadium batteries are mainly used in power station peak regulation, large-scale photoelectric conversion, energy storage power for wind power generation, and as energy storage systems in remote areas, uninterruptible power supplies or emergency power systems. [0003] At present, the electrode materials used in vanadium batteries are mainly carbon-based gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/88H01M4/96H01M8/188Y02E60/50
Inventor 黄权波卢粤湘
Owner 广州市泓能五金有限公司
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