A method for constructing seed tree effect of high specific surface carbon fiber mat and application thereof

A carbon fiber felt, high specific surface technology, applied in the construction method of planting effect and its application in vanadium batteries, can solve the problem of engineering promotion without vanadium batteries, providing economic benefits, low electrochemical activity and surface area, no modification It can solve the problems of vanadium batteries and other problems, and achieve the effects of easy engineering preparation, improved electrochemical surface area and low cost.

Inactive Publication Date: 2019-01-15
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

Polyacrylonitrile (PAN)-based carbon felt has become the material of choice for vanadium battery energy storage systems due to its low price and high stability. Cost Limiting Factor
In recent years, a large number of researchers have devoted themselves to improving the activity of electrode materials. Although some achievements have been achieved, up to now, there is still no modification method available for large-scale production to effectively improve the activity of vanadium batteries, and there is no project for vanadium batteries. Promotion provides economic benefits
[0004] In fact, the specific surface area of ​​commercial PAN-based carbon fiber felt is only 0.05-0.5m 2 g -1 , while other commonly used carbon materials have a specific surface area of ​​hundreds or even thousands of m 2 g -1 , if the surface area can be increased to 50 or even 100m by means of planting trees, digging pits, etc. 2 g -1 or so, then its current density will be reduced to below 1% under the same current

Method used

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  • A method for constructing seed tree effect of high specific surface carbon fiber mat and application thereof
  • A method for constructing seed tree effect of high specific surface carbon fiber mat and application thereof
  • A method for constructing seed tree effect of high specific surface carbon fiber mat and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] In this example, graphene oxide is dispersed in a Nafion (perfluorosulfonic acid) / ethanol solution with a weight concentration of 0.02%, and the concentration is 2 mg·mL -1 A dispersion of graphene oxide; then soak the polyacrylonitrile graphite felt in the dispersion, put it into an oven for drying after the absorption is complete, the temperature of the oven is 60°C, and the drying time is 6h; Graphite felt in N 2 The carbonization treatment is carried out in the atmosphere, the carbonization temperature is 1000°C, and the carbonization time is 3h. Finally, a carbon fiber felt composite electrode with a high specific surface area modified by nanometer graphene oxide can be obtained.

[0039] Through physical characterization, it is found that the nano-graphene oxide bonded on the surface of the carbon fiber is a flake-like structure, and most of them exist in a multi-layer graphene structure. ranging from tens of nanometers to hundreds of nanometers, such as image ...

Embodiment 2

[0041] In this embodiment, the multi-walled carbon nanotubes are dispersed in the Nafion / ethanol solution with a weight concentration of 0.02%, and the concentration is prepared into a dispersion liquid of 1.5wt.% multi-walled carbon nanotubes; then the polyacrylonitrile graphite felt is soaked In this dispersion liquid, after the absorption is complete, put it into an oven for drying. The temperature of the oven is 60°C, and the drying time is 6 hours; 2 The carbonization treatment is carried out in the atmosphere, the carbonization temperature is 1000°C, and the carbonization time is 3h. Finally, a high specific surface carbon fiber felt composite electrode decorated with multi-walled carbon nanotubes can be obtained.

[0042] Through physical characterization, it is found that the fiber surface of the composite electrode is relatively rough, and some carbon nanotubes are agglomerated into large-sized particles, while most of the carbon nanotubes are more uniformly dispersed ...

Embodiment 3

[0044] In this embodiment, the carbon fiber felt is soaked in a concentration of 1mol L -1 Ni(NO 3 ) 3 solution; then put it into an oven for drying, the temperature of the oven is 60°C, and the drying time is 6h; after drying, place it in H 2 The thermal reduction of the catalyst is carried out in the mixed gas of Ar / Ar, and the thermal reduction atmosphere is H with a molar ratio of 1:9. 2 / Ar mixed gas, the reduction temperature is 600°C, and the reduction time is 3h; then the chemical vapor deposition of carbon nanotubes and carbon nanofibers is carried out in the mixed gas of acetylene and hydrogen, wherein the molar ratio of acetylene and hydrogen is 1:25, and the deposition The temperature is 700°C, and the deposition time is 0.5h; it is carbonized at a temperature of 1000°C, and the carbonization time is 3h, and finally a high specific surface carbon fiber felt composite electrode modified by carbon nanotubes can be obtained.

[0045] Through physical characterizati...

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Abstract

The invention relates to the field of chemical power supply and electrochemical catalysis, in particular to a method for constructing seed tree effect of high specific surface carbon fiber mat and application thereof. In the post-treatment process of carbon fiber mat, carbon fiber mat composite electrode with high specific surface area was formed by bonding, growth and deposition of typical nano-functional materials on the surface of carbon fiber mat. Like trees planted on the surface of carbon fiber, these nano-functional materials can not only directly increase the surface area of carbon fiber mat composite electrode, but also improve the wettability of carbon fiber mat and thereby increase its electrochemical surface area. The invention mainly utilizes the tree planting effect of the typical nano functional material to make the prepared carbon fiber felt composite electrode have high electrochemical surface area, and the electrode is used as the positive electrode material and the negative electrode material of the vanadium battery, so that the electrochemical polarization in the reaction process of the vanadium battery can be greatly reduced, and the charging and discharging performance of the 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 method for constructing a tree-planting effect of a carbon fiber felt with a high specific surface area and its application in a vanadium battery. Background technique [0002] Vanadium Flow Battery (VFB) has become one of the preferred technologies for large-scale energy storage due to its outstanding advantages such as long service life, large scale, safety and reliability, but at this stage its high energy storage price limits the use of vanadium batteries Further promotion of technology. In addition to further reducing the cost of key materials of vanadium batteries, further improving the performance of vanadium batteries, and then increasing the power of a single stack is an important way to reduce the cost of vanadium battery energy storage. [0003] As the place where the electrode reaction of the vanadium battery occurs, the electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/88H01M4/96H01M8/188Y02E60/50
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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