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Modified method of graphite felt used for full-vanadium fluid flow battery electrode

A technology of all-vanadium redox flow battery and graphite felt, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low operating elasticity of air oxidation method, violent reaction of carbon fiber surface, and difficult control of oxidation reaction, etc. Fully contact, reduce battery internal resistance, improve wettability and chemical activity

Active Publication Date: 2011-07-27
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the operation flexibility of the air oxidation method is small, and the oxidation reaction is not easy to control; the technology introduced in "Chemical Modification of Graphite Felt Electrode and Its Electrochemical Behavior in Acidic Vanadium Solution" was published in the Chinese Journal of Nonferrous Metals in August 2005. The method is to use a strong acid oxidation method to treat the graphite felt. Using a strong acid is very dangerous and has a great potential safety hazard. This technical method is very difficult to apply to industrial production, and it will cause a violent reaction on the surface of the carbon fiber, making the surface of the fiber Corrosion will cause the consequences of reducing the service life of the material; Chinese patent literature (patent number: 200710202374.1) discloses a "method for surface modification of graphite felt and modified graphite felt", and the modification of graphite felt is in anodic oxidation Electrochemical cathode modification treatment before modification treatment
The modified graphite felt as an electrode greatly improves the electrochemical activity in the preparation of the all-vanadium redox flow battery, provides the voltage efficiency and energy efficiency of the battery discharge, and improves its stable discharge time, so that the all-vanadium redox flow battery The charge and discharge performance has been greatly improved, but it uses highly corrosive chemicals such as sodium hydroxide and sulfuric acid

Method used

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  • Modified method of graphite felt used for full-vanadium fluid flow battery electrode
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Using the air oxidation method, place the polyacrylonitrile-based graphite felt or viscose-based graphite felt with a thickness of 5mm in the muffle furnace of the heating device for air oxidation treatment, and heat up according to the set program, at 3 ° C / Heat to 400°C at a heating rate of 1 min and hold for 2.0 hours, then rise to 450°C and 500°C at a heating rate of 2°C / min and hold for 0.5 hours respectively, then clean with distilled water and dry.

[0023] (2) then use the hydrogen peroxide method to modify the graphite felt surface, put the graphite felt through the air oxidation treatment into pH=3, and the mass fraction is 15% hydrogen peroxide solution to carry out the modification process, Ultrasonic treatment was then performed at room temperature, and the reaction was performed under ultrasonic conditions for 4 hours.

[0024] (3) After the activated graphite felt obtained through the modification treatment and ultrasonic treatment was washed with d...

Embodiment 2

[0027] (1) Using the air oxidation method, place the viscose-based graphite felt with a thickness of 8mm in a muffle furnace for temperature programming, heat it to 400°C at a heating rate of 3°C / min and keep it for 2.0h, and then heat it at a rate of 2°C / min The heating rate was increased to 450°C and 500°C respectively and kept for 1.0h and 0.5h respectively, and the distilled water was cleaned and dried.

[0028] (2) Then use the hydrogen peroxide method to modify the graphite felt surface, put the graphite felt through the air oxidation treatment into pH=3.5, and the mass fraction is 10% in the hydrogen peroxide solution to carry out the modification process , and then subjected to ultrasonic treatment at room temperature, and reacted for 8 hours under ultrasonic conditions.

[0029] (3) After the activated graphite felt obtained through the modification treatment and ultrasonic treatment was washed with distilled water, it was dried in an oven at 80° C. for 12 hours. The...

Embodiment 3

[0032] (1) Using the air oxidation method, place a polyacrylonitrile-based graphite felt with a thickness of 10 mm in a muffle furnace for temperature programming, heat it to 400 °C at a heating rate of 3 °C / min and keep it for 2 hours, and then heat it at 2 °C / min The heating rate was increased to 450°C and 500°C respectively and kept for 1.5h and 0.5h respectively, and the distilled water was cleaned and dried.

[0033] (2) Then use the hydrogen peroxide method to modify the graphite felt surface, put the graphite felt through the air oxidation treatment into pH=3, and the mass fraction is 15% in the hydrogen peroxide solution to carry out the modification process , and then subjected to ultrasonic treatment at room temperature, and reacted for 6 h under ultrasonic conditions.

[0034] (3) After the activated graphite felt was washed with distilled water, it was dried in an oven at 80° C. for 12 hours. Then open a circular groove with a radius of 5mm on the surface of the g...

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Abstract

The invention relates to a modified method of a graphite felt used for a full-vanadium fluid flow battery electrode. Firstly a graphite felt is processed by an air oxidation method, and then the graphite felt processed by the air oxidation method is modified by utilizing hydrogen peroxide or an Fenton reagent. The modified method comprises the following steps: a. air oxidation processing: placingthe washed graphite felt into a heating device for heating; oxidizing in the hot air environment; naturally cooling to room temperature in the heating device after oxidation; and washing the cooled graphite felt; b. hydrogen peroxide or Fenton reagent modified processing: placing the washed graphite felt into the hydrogen peroxide or the Fenton reagent to be modified to obtain the modified graphite felt; and c. processing residues on the surface of the graphite felt: washing the graphite felt after being processed by a hydrogen peroxide solution or the Fenton reagent by utilizing distilled water; and removing the hydrogen peroxide or the Fenton reagent residual on the surface of the graphite felt. The modified method provided by the invention has the advantages of being simple and feasible in operation and low in cost and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of battery electrode manufacturing, and relates to a surface modification treatment method of graphite felt, in particular to a modification method of graphite felt for an all-vanadium redox flow battery electrode, which is mainly used for an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery is a new type of high-efficiency green secondary battery. It will not produce harmful substances to human body and environment during production and use. The vanadium battery uses vanadium ion solution as the positive and negative active materials. Like other flow batteries, there is no solid-state reaction, and no change in the structure and form of the electrode material occurs. It is cheap, long service life, high reliability, low operation and maintenance costs. According to relevant information, graphite felt, especially polyacrylonitrile-based graphite felt electrodes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 李爱魁杜涛杜忠东陈家宏陈轩恕罗传仙刘飞张杰
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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