Compound porous electrode and preparation method thereof as well as flow battery comprising compound porous electrode

A porous electrode and solution technology, used in battery electrodes, indirect fuel cells, circuits, etc., can solve the problem of not being able to improve electrochemical activity and electrical conductivity at the same time, and achieve improved electrochemical activity, mild treatment conditions, and simple process. Effect

Active Publication Date: 2013-11-27
DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to provide a composite porous electrode, its preparation method and a flow battery including the same, so as to solve the technical problem that the electrochemical activity and electrical conductivity cannot be simultaneously improved in the prior art

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  • Compound porous electrode and preparation method thereof as well as flow battery comprising compound porous electrode
  • Compound porous electrode and preparation method thereof as well as flow battery comprising compound porous electrode

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[0029] This application overcomes the general belief in the prior art that the material properties of graphene derivatives and porous electrodes are too different to be firmly attached to the surface of porous electrodes, especially when the battery is running, the electrolyte will flow through at a relatively large flow rate. Porous electrodes are very easy to wash away the catalytic components loosely attached to the surface of the porous electrodes. The invention provides a preparation method of a composite porous electrode, the preparation method comprising: Step S1, dispersing a solution having graphene oxygen-containing derivatives into a porous electrode body to obtain a composite porous electrode prefabricated body; Step S2, removing The solvent of the solution in the composite porous electrode prefabricated body obtains the composite porous electrode.

[0030]When the composite porous electrode formed by compounding graphene oxygen-containing derivatives rich in oxyge...

Embodiment 1

[0052] (1) Put the polyacrylonitrile graphite felt with a thickness of 5mm and a size of 300mm*500mm into deionized water for ultrasonic cleaning for 20 minutes, put it in an oven at 80°C for 12 hours, and place it in a desiccator for later use.

[0053] (2) Add 750 mg of graphene oxide into 750 ml of deionized water, and use ultrasonic treatment with a frequency of 20000 Hz for 30 min to prepare a dispersion liquid with a graphene oxide content of 1 mg / ml.

[0054] (3) Pour 750ml of the prepared dispersion into a square container with a size of 300mm*500mm*50mm, completely immerse the polyacrylonitrile graphite felt in the solution after ultrasonic cleaning, soak for 1 hour, and then put the dispersion and The container of polyacrylonitrile graphite felt was placed in an oven at 120° C., and heated for 24 hours to remove the solvent to prepare a graphene oxide-polyacrylonitrile graphite felt composite porous electrode.

[0055] (4) The porous composite porous electrode was us...

Embodiment 2

[0057] (1) Put the polyacrylonitrile graphite felt with a thickness of 5mm and a size of 300mm*500mm into deionized water for ultrasonic cleaning for 120 minutes, put it in an oven at 120°C for 8 hours, and place it in a desiccator for later use.

[0058] (2) Add 600 mg of graphene oxide to 600 ml of ethanol, and use ultrasonic treatment at a frequency of 20000 Hz for 30 min to prepare a dispersion with a graphene oxide content of 1 mg / ml.

[0059](3) Pour 600ml of the prepared dispersion into a square container with a size of 300mm*500mm*50mm, immerse the polyacrylonitrile graphite felt after ultrasonic cleaning into the solution to a depth of 4mm, soak for 1 hour, and then The container containing the dispersion liquid and polyacrylonitrile graphite felt was placed in an oven at 70°C, and heated for 24 hours to remove the solvent, so as to prepare a graphene oxide-polyacrylonitrile graphite felt composite porous electrode.

[0060] (4) The porous composite porous electrode w...

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Abstract

The invention provides a compound porous electrode and the preparation method thereof as well as a flow battery comprising the compound porous electrode. The preparation method of the compound porous electrode comprises the following steps of: step S1, dispersing the solution with a graphene oxygen-containing derivative to a porous electrode body, thus obtaining a prefabricated body of the compound porous electrode; step S2, removing the solvent of the solution in the prefabricated body of the compound porous electrode, thereby obtaining the compound porous electrode. According to the preparation method provided by the invention, oxygen-containing groups on the surface of the graphene oxygen-containing derivative of the acquired compound porous electrode can catalyze the electrochemical reactions between vanadium ion electrons, the conduction performance of electrons is optimized, the electrochemical activity of the electrode is improved, furthermore, during the compounding process of the graphene oxygen-containing derivative and the porous electrode body, the graphene oxygen-containing derivative cannot cause an overoxidation effect on the porous electrode body, and furthermore no negative effect is caused to the stability and service life of electrode materials; meanwhile, the preparation method is simple in technical process, mild in treatment conditions and suitable for industrial application.

Description

technical field [0001] The invention relates to the field of flow batteries, in particular to a composite porous electrode, a preparation method thereof and a flow battery comprising the same. Background technique [0002] Flow battery is a new type of electrochemical energy storage system. Compared with other energy storage technologies, flow battery has the advantages of large power, large capacity, high energy conversion efficiency, long service life, high safety, and environmental protection. Large-scale energy storage systems supporting photovoltaic power generation and wind power generation, smart grid peak regulation, communication base stations, and distributed power sources have broad application prospects. [0003] The all-vanadium redox flow battery 3 is a kind of redox flow battery. It uses vanadium ion electrolytes in different valence states as the positive and negative active materials of the battery 3, and the positive electrode 31 is V 4+ / V 5+ Electric pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/86H01M8/20
CPCY02E60/528Y02E60/50
Inventor 高艳汤浩殷聪谢光有房红琳杜坤周正
Owner DONGFANG ELECTRIC (CHENGDU) HYDROGEN FUEL CELL TECH CO LTD
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