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A construction method of functional graphite felt and its application in vanadium battery

A construction method and technology of graphite felt, applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of decreased electrical conductivity, limited improvement of electrochemical performance, weakened positive effect of electrochemical activity, etc. Electrochemical and electrochemical polarization, low cost, excellent electrical conductivity

Inactive Publication Date: 2019-01-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional modification methods may change the microstructure and chemical composition of the electrode surface within hundreds of nanometers or even a few micrometers, and the increase of oxygen-containing groups will cause a decrease in electrical conductivity, thereby weakening the positive effect brought about by the improvement of electrochemical activity. , resulting in a limited improvement in its electrochemical performance

Method used

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  • A construction method of functional graphite felt and its application in vanadium battery
  • A construction method of functional graphite felt and its application in vanadium battery
  • A construction method of functional graphite felt and its application in vanadium battery

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Embodiment 1

[0036] In the present embodiment, the polyacrylonitrile-based raw felt is placed in a graphitization furnace, under N 2 Graphitization treatment is carried out in the atmosphere, wherein the treatment temperature is 2300 °C, and the treatment time is 3 hours, and graphite felt with excellent conductivity can be obtained; the above-mentioned graphite felt is directly placed in the mixed gas of methane and hydrogen by pyrolysis method to realize carbon nanotubes 1. Chemical deposition of nanofibers on graphite felt fibers, wherein the molar ratio of methane and hydrogen is 1:10, the decomposition temperature is 800°C, and the deposition time is 1h; finally graphite felt / nano short fiber functional composite electrodes can be obtained.

[0037] Through physical characterization, it is found that a large number of carbon nanotubes or carbon nanofibers grow on the surface of the carbon fiber of the composite electrode, the diameter of which is about 100-200nm, and its conductivity i...

Embodiment 2

[0039] In the present embodiment, the polyacrylonitrile-based raw felt is placed in a graphitization furnace, under N 2 Graphitization treatment is carried out in the atmosphere, wherein the treatment temperature is 2500 ° C, and the treatment time is 3 hours, and graphite felt with excellent conductivity can be obtained; the above-mentioned graphite felt is directly placed in a mixture of methane and hydrogen by pyrolysis to form carbon nanotubes. 1. Chemical deposition of nanofibers on graphite felt fibers, wherein the molar ratio of methane and hydrogen is 1:10, the decomposition temperature is 800°C, and the deposition time is 1h; finally graphite felt / nano short fiber functional composite electrodes can be obtained.

[0040] Such as Figure 4-Figure 5 As shown, through physical characterization, it is found that a large number of carbon nanotubes or carbon nanofibers grow on the surface of the carbon fiber of the composite electrode, the diameter of which is about 100-200...

Embodiment 3

[0042] In the present embodiment, the polyacrylonitrile-based raw felt is placed in a graphitization furnace, under N 2 Graphitization treatment is carried out in the atmosphere, wherein the treatment temperature is 2700 °C, and the treatment time is 3 hours, and graphite felt with excellent conductivity can be obtained; the above-mentioned graphite felt is directly placed in a mixture of methane and hydrogen by pyrolysis to realize carbon nanotubes. 1. Chemical deposition of nanofibers on graphite felt fibers, wherein the molar ratio of methane and hydrogen is 1:10, the decomposition temperature is 800°C, and the deposition time is 1h; finally graphite felt / nano short fiber functional composite electrodes can be obtained.

[0043] Through physical characterization, it is found that a large number of carbon nanotubes or carbon nanofibers grow on the surface of the carbon fiber of the composite electrode, the diameter of which is about 100-200nm, and its conductivity is 191.7mS ...

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Abstract

The invention relates to the field of chemical power supply and electrochemical catalysis, in particular to a construction method of a functional graphite felt and an application thereof in a vanadiumbattery. Firstly, graphitizing the raw felt at high temperature to obtain a graphite felt substrate with excellent electrical conductivity; Functional nanofibers were deposited on the carbon fiber surface of graphite mat substrate by pyrolysis treatment in carbon source atmosphere to form graphite mat / nanofiber composite electrode with high conductivity, specific surface area and electrocatalyticactivity. The invention mainly performs functional design on the conductive layer and the activated layer according to their roles in the electrode reaction process, further finishes the preparationof the high-performance graphite felt through graphitization and pyrolysis treatment, and successfully solves the contradiction between the conductivity and the electrochemical activity of the carbonfiber felt at the present stage. The ohmic polarization and electrochemical polarization in the reaction process of vanadium battery can be greatly reduced by using the functional graphite felt as thepositive and negative electrode materials of vanadium battery, and the charging and discharging performance of vanadium battery can be further improved.

Description

technical field [0001] The invention relates to the fields of chemical power sources and electrochemical catalysis, in particular to a construction method of functional graphite felt and its application in vanadium batteries. Background technique [0002] Vanadium Flow Battery (VFB) is based on VO 2 + / VO 2+ with V 3+ / V 2+ A pair of liquid flow energy storage batteries, the energy of which is stored in the electrolyte. Compared with other energy storage technologies, due to its outstanding advantages such as long service life, large scale, safety and reliability, vanadium batteries can be used not only as supporting energy storage devices in the power generation process of renewable energy such as wind energy and solar energy, but also in power grid systems. It has become one of the preferred technologies for large-scale energy storage to realize the function of frequency modulation and peak regulation. [0003] Although it has obvious advantages in battery capacity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/96H01M8/18
CPCH01M4/8647H01M4/8652H01M4/96H01M8/188Y02E60/50
Inventor 范新庄井明华张建国王绍亮刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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