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Preparation method for combination electrode for all-vanadium redox flow battery

An all-vanadium redox flow battery and composite electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low surface activity of electrode materials and unstable electrocatalytic performance of electrode materials, and achieve excellent electrocatalytic activity and electrocatalytic performance. Improve chemical activity and increase the effect of electrode reaction area

Inactive Publication Date: 2014-12-24
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

[0005] The purpose of the present invention is to provide a method for preparing a bismuth-based catalyst / carbon nanofiber composite electrode for an all-vanadium redox flow battery, so as to solve the problem of low surface activity of the electrode material and defects of the electrode material in the electrode reaction of the all-vanadium redox flow battery in the prior art. Unstable electrocatalytic performance and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] In a specific embodiment of the present invention, the preparation method of bismuth-based catalyst / carbon nanofiber electrode for all-vanadium redox flow battery comprises the following steps and process method:

[0034] 1) Preparation of spinning solution: adding polyacrylonitrile or polyethylene glycol into dimethylformamide or dimethylacetamide in a certain proportion, stirring evenly under water bath conditions;

[0035] Among them, the average molecular weight of polyacrylonitrile is 50,000-200,000, the average molecular weight of polyethylene glycol is 2,000-10,000, and the mass ratio of polyacrylonitrile or polyethylene glycol to dimethylformamide or dimethylacetamide is 5 : 95 to 20: 80 (preferably 10: 90 to 15: 85), the water bath temperature is 40 ~ 80 ° C, the stirring time of polyacrylonitrile or polyethylene glycol in dimethylformamide or dimethylacetamide 0.5 to 24 hours (preferably 3 to 6 hours).

[0036] 2) Add bismuth powder or bismuth salt (one or mo...

Embodiment 1

[0049] 1) Add polyacrylonitrile with a mass fraction of 10% into dimethylformamide with stirring, 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.

[0050] 2) Add bismuth powder to the spinning solution, the mass ratio of the added bismuth powder to polyacrylonitrile in the solution is 1:100, stir for 12 hours, and then ultrasonic for 6 hours to obtain a uniform composite spinning solution.

[0051] 3) Add the composite spinning solution obtained in step 2) into a 20ml syringe, the diameter of the pinhole is 0.3mm, the distance between the needle and the roller is 12cm, and the spinning voltage between the needle and the roller is 25kV , the collecting plate is carbon paper with a thickness of 200 microns, the rotating speed of the roller is 200 rpm, the flow rate of the spinning solution is 0.5 ml / hour, the spinning temperature is 40° C., and the humidity is 50% RH....

Embodiment 2

[0056] The difference from Example 1 is:

[0057] 1) Polyethylene glycol with a mass fraction of 10% was added to dimethylformamide under stirring conditions, and the temperature of the water bath was 40° C. and stirred for 3 hours to obtain a composite spinning solution. The average molecular weight of polyethylene glycol was 8000.

[0058] 2) Add bismuth powder to the spinning solution, the mass ratio of the added bismuth powder to polyacrylonitrile in the solution is 1:100, stir for 12 hours, and then ultrasonic for 6 hours to obtain a uniform composite spinning solution.

[0059] 3) adding the composite spinning solution obtained through step 2) into a 20ml syringe, the diameter of the pinhole is 0.6 millimeters, the distance between the needle and the roller is 15 centimeters, and the spinning voltage between the needle and the roller is 25kV, the collecting plate is carbon paper with a thickness of 200 microns, the rotating speed of the roller is 200 rpm, the flow rate o...

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Abstract

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method of a bismuth-base catalyst / carbon nanofiber combination electrode for an all-vanadium redox flow battery. Firstly, spinning solution required for an experiment is prepared and then bismuth salt and the spinning solution are uniformly mixed. According to an electrostatic spinning method, a required nanofiber film is prepared and then the nanofiber film is pre-oxidized in the air and is carbonized in an inert atmosphere tube furnace so as to obtain the required bismuth-base electrocatalyst / carbon nanofiber combination electrode. After the obtained electrode material is cleaned and dried, testing of related electrochemical performance representation and charge-discharge properties can be carried out on the electrode material. The carbon fiber diameter, which is prepared according to the preparation method, is in the nano class; compared with a specific surface area of a conventionally used electrode material, the specific surface area of the bismuth-base catalyst / carbon nanofiber combination electrode is greatly increased. Moreover, the carbon nanofibers are compounded with a high-activity bismuth-base electrocatalyst, and thus, electrochemical activity of the electrode can be greatly improved, so that energy efficiency of the all-vanadium redox flow battery is greatly improved.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to a method for preparing a bismuth-based catalyst / nano-carbon fiber composite electrode for an all-vanadium redox flow battery. Background technique [0002] The all-vanadium redox flow battery is a new type of secondary battery that utilizes the chemical changes in different valence states of vanadium ions to store energy. The electrochemical polarization is reduced, and its rated power and rated power can be designed separately. Instantaneous charging can be achieved by replacing the electrolyte, and 100% deep discharge will not damage the battery. Based on the above advantages, it 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 all-vanadium redox flow batteries are mainly carbon-based graphite felt or carbon felt, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88D01F1/10D04H1/4382D04H1/728D06C7/04D06B21/00
CPCD01F1/10D04H1/4382D04H1/728D06B21/00D06C7/04H01M4/88H01M4/9083Y02E60/50
Inventor 刘建国魏冠杰严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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