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Composite carbon fiber electrode material with adjustable structure function, preparation method thereof and application thereof in flow battery

A technology of composite carbon fiber and electrode materials, applied in nanotechnology for materials and surface science, fuel cells, regenerative fuel cells, etc., can solve the problem that the performance of liquid flow batteries is difficult to further improve, and achieve good conductivity and reaction The effect of activity, high conductivity, and easy operation

Active Publication Date: 2020-07-31
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by its electrochemical activity and inherent structure, it is difficult to further improve the performance of flow batteries.

Method used

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  • Composite carbon fiber electrode material with adjustable structure function, preparation method thereof and application thereof in flow battery
  • Composite carbon fiber electrode material with adjustable structure function, preparation method thereof and application thereof in flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Composite carbon fiber electrode material with adjustable structure and function

[0029] (1) Preparation of nitrogen-doped chitin cellulose elastic carbonaceous microspheres

[0030] Nitrogen-doped chitin cellulose elastic carbonaceous microspheres are synthesized by microemulsion method, comprising the following steps:

[0031] 1) Chitin powder is sequentially washed with NaOH, HCl and NaClO 2 The aqueous solution was washed and purified, and dried for later use.

[0032] 2) Take 7g of purified chitin powder and place it in a mixture of 200g of NaOH / urea / water (mass ratio: 11:4:85), freeze at -30°C for 4 hours, and thaw; repeat freezing and thawing twice , and degassed by centrifugation to obtain a chitin dispersion.

[0033] 3) Mix 280g of isooctane and 10g of Span 85, stir at high speed at 2000 rpm for 20min, and disperse evenly. The resulting dispersion was placed in an ice-water bath, and the chitin dispersion obtained in step 2) was added dropwise w...

Embodiment 2

[0045] Example 2 The electrochemical performance of the composite carbon fiber electrode material whose structure and function can be regulated

[0046] Method: Using a three-electrode system, use the 1cm electrode prepared in Example 1 2 The blank carbon fiber electrode material and the 3# composite carbon fiber electrode material with adjustable structure and function are used as the working electrode, the saturated common electrode is used as the reference electrode, the platinum sheet is used as the counter electrode, and 0.1M VOSO 4 +2.0M H 2 SO 4 As the electrolyte, the electrochemical performance of the electrode was investigated by cyclic voltammetry with a scan rate of 5mV / s.

[0047] Such as figure 2 As shown, two pairs of redox peaks appear on the surface of both electrodes, corresponding to V 4+ / V 5+ and V 2+ / V 3+ electrochemical redox process. The composite carbon fiber electrode with adjustable structure and function prepared by the present invention s...

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Abstract

The invention discloses a composite carbon fiber electrode material with an adjustable structure function, a preparation method thereof and application thereof in a flow battery. The preparation method comprises the following steps: adding synthesized elastic carbonaceous microspheres into a mixed solution of polyacrylonitrile (PAN) and N, N-dimethylformamide (DMF), and uniformly mixing to obtaina spinning solution; spinning by utilizing the spinning solution to obtain original polyacrylonitrile nanofibers; and carrying out pre-oxidation treatment and carbonization treatment on the obtained original polyacrylonitrile nanofibers to obtain a target product. When the material is applied to an electrode material of a flow battery, activated polarization caused by charge transfer resistance, ohmic polarization caused by contact resistance and concentration polarization caused by mass transfer can be effectively reduced, so that the energy efficiency and the power density of the battery areimproved, and the cycle life of the battery is prolonged. The method is simple and easy to operate, has universality, can perform targeted design on the material structure and function according to different requirements, and is wide in application.

Description

technical field [0001] The invention relates to the technical field of battery materials and energy storage, in particular to a composite carbon fiber electrode material with adjustable structure and function, a preparation method thereof, and an application in a liquid flow battery. Background technique [0002] With the continuous development of new energy sources such as wind energy and solar energy, the corresponding energy storage supporting equipment has also received more and more attention. Compared with other energy storage technologies, vanadium redox flow batteries, iron-chromium redox flow batteries, and organic redox flow batteries have outstanding advantages such as large storage capacity, long service life, safety and reliability, and have become the first-choice technologies for large-scale energy storage. [0003] As the place where the electrochemical reaction of the flow battery occurs, the porous electrode largely determines the performance of the battery...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/88H01M8/18B82Y30/00
CPCH01M4/96H01M4/8878H01M4/8882H01M8/188B82Y30/00Y02E60/50
Inventor 房大维井明华齐笑辰
Owner LIAONING UNIVERSITY