Preparation method of thermally-reduced graphene oxide/nano carbon fiber composite electrode for full-vanadium flow battery

An all-vanadium redox flow battery and nano-carbon fiber technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of unstable electrocatalytic performance of electrode materials and low surface activity of electrode materials, and achieve excellent electrocatalytic activity. Electrochemical activity, the effect that the experimental conditions are easy to meet

Inactive Publication Date: 2015-02-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a thermally reduced graphene oxide / nano-carbon fiber composite electrode for an all-vanadium redox flow battery, which solves the problem of low surface activity of the electrode material and the electrode reaction of the all-vanadium redox flow battery existing in the prior art. The electrocatalytic performance of the material is unstable and other problems

Method used

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Examples

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preparation example Construction

[0032] In a specific embodiment of the present invention, the preparation method of thermally reduced graphene oxide / carbon nanofiber composite electrode for all-vanadium redox flow battery comprises the following steps and process method:

[0033] 1) Preparation of spinning solution: adding polyacrylonitrile or polyethylene glycol into dimethylformamide or dimethylacetamide in a certain proportion, stirring evenly under water bath conditions;

[0034] 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).

[0035] 2) Add graphite oxide powder...

Embodiment 1

[0048] 1) Add polyacrylonitrile with a mass fraction of 10% into dimethylformamide under stirring conditions, and stir for 2 hours at a water bath temperature of 60° C. to obtain a spinning solution. The average molecular weight of polyacrylonitrile is 150,000.

[0049] 2) Add graphite oxide powder to the spinning solution, the mass ratio of the added graphite oxide powder to the polyacrylonitrile in the solution is 1:100, stir for 12 hours, and then ultrasonic for 6 hours to obtain a uniform composite spinning solution .

[0050] 3) adding the composite spinning solution obtained in step 2) into a 20ml syringe, and using electrospinning technology to obtain a nanofiber membrane, the thickness of the nanofiber membrane is 0.5 mm;

[0051] Among them, the electrospinning process parameters are: the needle aperture is 0.3 mm, the distance between the needle and the nanofiber film collecting plate on the roller is 12 cm, the spinning voltage between the needle and the roller is 2...

Embodiment 2

[0056] 1) Polyethylene glycol with a mass fraction of 10% was added to dimethylacetamide under stirring conditions, and the temperature of the water bath was 40° C. and stirred for 3 hours to obtain a spinning solution. The average molecular weight of polyethylene glycol was 8,000.

[0057] 2) Add graphite oxide powder to the spinning solution, the mass ratio of the added graphite oxide powder to polyethylene glycol in the solution is 1:100, stir for 12 hours, and then ultrasonic for 6 hours to obtain a uniform composite spinning liquid.

[0058] 3) adding the composite spinning solution obtained in step 2) into a 20ml syringe, and using electrospinning technology to obtain a nanofiber membrane, the thickness of the nanofiber membrane is 0.5 mm;

[0059] Among them, the electrospinning process parameters are: the aperture of the needle head is 0.6 mm, the distance between the needle head and the nanofiber film collecting plate on the rotating roller is 15 cm, the spinning volt...

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Abstract

The invention relates to the field of battery manufacturing and energy source storage and particularly provides a preparation method of a thermally-reduced graphene oxide / nano carbon fiber composite electrode for a full-vanadium flow battery. The preparation method comprises the following steps: firstly, preparing a spinning solution for an experiment; secondly, uniformly mixing graphite oxide powder and the spinning solution; stripping the graphite oxide powder into graphene oxide by using an ultrasonic manner; preparing a nano fiber membrane by adopting an electrostatic spinning method; and then pre-oxidizing the nano fiber membrane in the air and carbonizing in an inert atmosphere pipe type furnace to obtain the needed thermally-reduced graphene oxide / nano carbon fiber composite electrode. According to the full-vanadium flow battery composite electrode prepared by the method, the diameter of carbon fibers is a nano scale; and the carbon fibers are compounded with thermally-reduced graphene oxide and the roughness of the fibers is greatly increased, so that the specific surface area of the electrode is two orders of magnitudes higher than that of a traditionally-used electrode material. Meanwhile, the high-activity thermally-reduced graphene oxide is adopted so that the electrochemical activity of the electrode is 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 heat-reduced graphene oxide / 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 f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8817H01M4/8875H01M4/8882Y02E60/50
Inventor 刘建国魏冠杰严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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