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Method for improving activity of carbon fiber felt for vanadium battery

A technology of carbon fiber mat and vanadium battery, which is applied in the field of vanadium battery, can solve the problems affecting vanadium battery, etc., and achieve the effect of excellent battery performance, conducive to popularization and application, and control of electrical conductivity

Active Publication Date: 2022-02-18
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the pore size of the carbon fiber felt is not uniform due to physical extrusion force in the assembly of the vanadium battery in the prior art, which affects the performance of the vanadium battery, and provides a method for improving the activity of the carbon fiber felt. Carbon nanotubes are introduced into the upper and lower ends of the felt to change the pore size of the carbon fibers at the upper and lower ends, so as to improve the activity of the carbon fiber felt and improve the performance of the vanadium battery

Method used

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Examples

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preparation example Construction

[0044] In the step C of the present invention, the nickel powder solution is prepared by the following method: first soak the nickel powder in hydrogen peroxide, filter, wash, and dry, according to the fact that the nickel powder accounts for 3 to 10% of the total mass of the nickel powder solution, mix with water Mixed, ultrasonic treatment, that is.

[0045] When preparing the nickel powder liquid, the particle size of the nickel powder is 50-100nm; the mass percent concentration of the hydrogen peroxide is 5-15%; the soaking time is 2-4 hours; the washing is water washing 2 to 4 times; the ultrasonic treatment time is 15 to 30 minutes.

[0046]In step C of the present invention, the mass concentration of hydrogen peroxide is 30% to 50%, and pyrrole is polymerized by using high-concentration and strong oxidizing hydrogen peroxide; Adding too much leads to waste, so the addition of hydrogen peroxide is controlled to be 3 to 6% of the volume of the nickel powder solution.

...

Embodiment 1

[0060] Immerse the upper and lower ends of the pretreated carbon fiber felt with a thickness of 3 mm into 1 / 4 of the total thickness in the pyrrole-acetone mixture (pyrrole: acetone volume ratio is 1:1), soak until liquid remains on the surface, take it out, and place it in the After standing at room temperature for 4 hours;

[0061] Put the part of the carbon fiber felt that has been treated with the pyrrole-acetone mixture solution into the nickel powder solution with a particle size of 50nm and a mass concentration of 3% for 15 minutes, and keep the ultrasonic dropwise addition of nickel powder with a mass concentration of 30% and a volume of Liquid 6% hydrogen peroxide, after the dropwise addition, after 5 minutes of reaction, raise the carbon fiber felt part to a height of 3 / 4 of the part treated with the pyrrole-acetone mixture, then ultrasonically react for 5 minutes, and wash 3 times, Drying; the other side is treated in the same way (the part of the other side of the ...

Embodiment 2

[0064] Immerse the upper and lower ends of the pretreated carbon fiber felt with a thickness of 5 mm into 1 / 4 of the total thickness in the pyrrole-acetone mixture (pyrrole: acetone volume ratio is 2:1), soak until there is liquid residue on the surface, take it out, and place it in the After standing at room temperature for 5 hours;

[0065] Put the part of the carbon fiber felt that has been treated with the pyrrole-acetone mixture solution into the nickel powder solution with a particle size of 70nm and a mass concentration of 5% for 20 minutes. After the 5% hydrogen peroxide of the powder liquid is added dropwise, after 10 minutes of reaction, the carbon fiber felt part is raised to a height of 2 / 3 of the part treated with the pyrrole-acetone mixture, and then ultrasonically reacted for 10 minutes, after washing 4 times , dry; the other side is treated in the same way (the part of the other side of the carbon fiber felt that has been treated with the pyrrole-acetone mixed ...

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Abstract

The invention discloses a method for improving the activity of a carbon fiber felt for a vanadium battery, and belongs to the technical field of vanadium batteries. The method comprises the following steps: putting the carbon fiber felt into a sulfuric acid solution for ultrasonic treatment; immersing the upper end and the lower end which account for 1 / 4-1 / 3 of the total thickness of the felt into pyrrole-acetone liquid for modification; respectively putting the upper end and the lower end of the modified carbon fiber felt into nickel powder liquid and hydrogen peroxide for ultrasonic treatment, adjusting the height, and respectively carrying out ultrasonic treatment on the upper end and the lower end accounting for 1 / 3-3 / 4 of the thickness of the treated part; and carrying out calcining in nitrogen and acetylene, and finally soaking in mixed acid to obtain the electrode for the vanadium battery. Carbon nanotubes are introduced into the upper and lower ends of the carbon fiber felt by using a vapor deposition method, so that the pore diameters of the carbon fibers at the upper and lower ends are changed, the purposes of improving the activity of the carbon fiber felt and improving the performance of the vanadium battery are achieved, and the problem that the performance of the vanadium battery is influenced by non-uniform pore diameters of the carbon fiber felt due to physical extrusion stress during vanadium battery assembly is solved.

Description

technical field [0001] The invention belongs to the technical field of vanadium batteries, and in particular relates to a method for improving the activity of carbon fiber mats used in vanadium batteries. Background technique [0002] Vanadium battery is a relatively clean battery system suitable for large-scale energy storage. The composition of vanadium battery is usually composed of plate frame, current collector, electrode, membrane, etc., and these series of materials are used to form a battery under pressure. In these materials, the electrodes of the battery mainly play two roles, one is to provide a place for the electrolyte reaction, and the other is to conduct the current generated by the electrolyte reaction to the current collector, so porous materials with certain conductivity are usually used As the electrode of vanadium battery. Carbon fiber felt is the most commonly used electrode material for vanadium batteries, but because this series of products is not spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/88H01M4/96H01M8/18Y02E60/50
Inventor 李道玉杨小琴丁治天姚洁
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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