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A kind of preparation method of high-performance composite carbon felt

A composite carbon, high-performance technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor performance of a single VRB, poor hydrophilicity of carbon felt, and low electrochemical activity, and achieve improved conductivity and good stability. , the effect of high electrochemical catalytic activity

Active Publication Date: 2016-11-02
刘奇
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a preparation method of high-performance composite carbon felt, to solve the problem of poor hydrophilicity, poor stability, low electrical conductivity, low electrochemical activity and single carbon felt existing in the prior art. Problems such as poor VRB performance

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  • A kind of preparation method of high-performance composite carbon felt

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Embodiment 1

[0034] A kind of preparation method of high-performance composite carbon felt that the present invention proposes, comprises the following steps:

[0035] 1. Preparation of functionalized carbon nanotubes: first put 200mg of dried carbon nanotubes into 500-1000ml of deionized water, stir for 20-30 minutes; then weigh 600mg of p-aminobenzenesulfonic acid, stir for 1h, then add 2ml Hydrochloric acid, heat the above solution in water at 30°C for 3h; weigh 1g of sodium nitrite and add it to the above solution, react in water at 30°C for 3h; Then dry at 50°C to obtain functionalized carbon nanotubes.

[0036] 2. Preparation of functionalized carbon nanotube solution: Weigh 50 mg of functionalized carbon nanotubes, add 150 ml of deionized water, then add 5 ml of Nafion solution with a mass fraction of 5%, ultrasonicate for 30 minutes, then stir for 2 hours before use.

[0037] 3. Preparation of modified carbon felt: 500mg carbon felt was vacuum-dried at 70°C for 6 hours, then soake...

Embodiment 2

[0042] The difference from Example 1 is:

[0043] 1. During the preparation of the functionalized carbon nanotubes, the mass of the carbon nanotubes becomes 400 mg.

[0044] 2. The composite carbon felt was prepared in the same steps as in Example 1.

[0045] The internal resistance of the separator in the all-vanadium redox flow battery measured at room temperature is 0.85Ω / cm 2 , the surface resistance of the composite film prepared at this ratio is higher than that of the original carbon felt (0.68Ω / cm 2 ), the performance of the battery in VRB is similar to that of the original carbon felt, which is suitable for the application requirements of VRB. The carbon nanotubes prepared in this ratio have a low degree of functional grouping, so the proton conductivity and hydrophilic performance are reduced, and the voltage efficiency will be reduced during the charging and discharging process of the battery.

Embodiment 3

[0047] The difference from Example 1 is:

[0048] 1. Add 20 mg of functionalized carbon nanotubes to the preparation of the functionalized carbon nanotube solution.

[0049] 2. The composite carbon felt was prepared in the same steps as in Example 1.

[0050]During the preparation process, due to the reduced addition of functionalized carbon nanotubes, under the same conditions, the loading of functionalized carbon nanotubes on the composite electrode decreases, so the proton conductivity of the composite electrode will decrease, which is lower than that of Example 1. Therefore, the internal resistance of the separator in the all-vanadium redox flow battery measured at room temperature is 0.62Ω / cm 2 , the surface resistance of the composite film prepared at this ratio is lower than that of the original carbon felt (0.68Ω / cm 2 ), the battery voltage efficiency in VRB is higher than that of original carbon felt, which basically meets the application requirements of VRB. Howev...

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Abstract

The invention relates to the field of electrode materials for vanadium redox batteries (VRB), in particular to a preparation method of high-performance composite carbon felt, and solves the problems that the existing carbon felt electrode for the vanadium battery is poor in hydrophilicity, small in active area, low in electrochemical activity and conductivity, poor in vanadium ion electric catalytic performance, and low in single battery performance. The preparation method comprises the following steps: taking commercial carbon felt as a raw material, and using a method that a binder is used for binding to prepare the functionalized carbon tube composite carbon felt. The composite carbon felt prepared by the method disclosed by the invention has the advantages of good hydrophilicity, electrochemical catalysis performance, conductivity, chemical stability and single VRB performance. The preparation method disclosed by the invention is simple and easy in operation, the product cost is low, industrialized production is facilitated, environment friendliness is achieved, and the high-performance composite carbon felt can be widely applied to the field of the vanadium redox batteries.

Description

technical field [0001] The invention relates to the field of electrode materials for all-vanadium redox flow batteries (VRB), in particular to a preparation method of a suitable high-performance composite carbon felt. Background technique [0002] With the rapid development of the economy, new energy materials have attracted widespread attention due to their environmental friendliness and abundant resources. However, the renewable energy generation process such as wind energy and solar energy has the disadvantages of discontinuity and instability. In order to solve this problem, it is necessary to develop large-scale energy storage technologies that are efficient, cheap, less polluting, and safe and reliable. All-vanadium redox flow battery (VRB) is widely used in wind energy and solar power generation process energy storage equipment due to its advantages of power and energy independence, long cycle life, high energy efficiency, low maintenance cost, fast and deep charge an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88
CPCH01M4/8668H01M4/88Y02E60/50
Inventor 贾传坤刘奇贺浩韦铭泽刘亚栋
Owner 刘奇
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