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Preparation method of tungsten-based catalyst/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 low surface activity of electrode materials and unstable electrocatalytic performance of electrode materials, and achieve excellent electrocatalytic activity and electrocatalytic performance. Improvement of chemical activity and improvement of energy efficiency

Inactive Publication Date: 2015-02-04
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 preparation method of a tungsten-based catalyst / nano-carbon fiber composite electrode for an all-vanadium redox flow battery, so as to solve the problem of low surface activity of the electrode material and problems of the electrode material in the electrode reaction of the all-vanadium redox flow battery existing in the prior art. Unstable electrocatalytic performance and other issues

Method used

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Examples

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preparation example Construction

[0033] In a specific embodiment of the present invention, the preparation method of tungsten-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 tungsten salts (one or more of tungsten-...

Embodiment 1

[0049] 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.

[0050] 2) Add tungstic acid to the spinning solution, the mass ratio of the added tungstic acid to the polyacrylonitrile in the solution is 1:50, stir for 12 hours, and then ultrasonic for 6 hours to obtain a uniform composite spinning solution.

[0051] 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;

[0052] 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 25 kV, and the colle...

Embodiment 2

[0057] 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.

[0058] 2) Add tungstic acid to the spinning solution, the mass ratio of the added tungstic acid to polyethylene glycol in the solution is 1:50, 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 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;

[0060] 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 voltage between the ...

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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 tungsten-based catalyst / nano carbon fiber composite electrode for a full-vanadium flow battery. The preparation method comprises the following steps: preparing a spinning solution for an experiment; uniformly mixing a tungsten salt with the spinning solution; preparing a nano fiber membrane by adopting an electrostatic spinning method; and pre-oxidizing the nano fiber membrane in air and carbonizing in an inert atmosphere pipe type furnace to obtain the needed tungsten-based catalyst / nano carbon fiber composite electrode. After the obtained electrode material is washed and dried, related electrochemical performance characterization and charging and discharging performance tests can be carried out on the electrode material. According to the prepared tungsten-based catalyst / nano carbon fiber composite electrode for the full-vanadium flow battery, the diameter of carbon fibers is nano-grade; and compared with a traditionally-used electrode material, the specific surface area is greatly enlarged. Nano carbon fibers are compounded with a high-activity tungsten-based catalyst, and the electrochemical activity of an electrode is greatly improved, so that the energy efficiency of the full-vanadium flow battery is extremely improved.

Description

technical field [0001] The invention relates to the field of battery manufacturing and energy storage, in particular to a method for preparing a tungsten-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): H01M4/88
CPCH01M4/88H01M4/90Y02E60/50
Inventor 刘建国魏冠杰严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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