Porous carbon fiber electrode for flow battery and preparation method of porous carbon fiber electrode

A porous carbon fiber and liquid flow battery technology, which is applied in the directions of battery electrodes, fiber treatment, fiber chemical characteristics, etc., can solve the problems that porous fiber filaments are difficult to obtain a uniformly distributed pore structure, and cannot contribute specific surface area, etc., to achieve good transmission performance, Effect of reducing activation loss and improving overall performance

Active Publication Date: 2021-02-09
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, it is difficult to obtain a uniformly distributed pore structure in the porous fiber filaments obtained by using this method, and most of the pores are distributed inside the fiber filaments, so they cannot contribute to the available specific surface area.

Method used

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  • Porous carbon fiber electrode for flow battery and preparation method of porous carbon fiber electrode
  • Porous carbon fiber electrode for flow battery and preparation method of porous carbon fiber electrode
  • Porous carbon fiber electrode for flow battery and preparation method of porous carbon fiber electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A porous carbon fiber electrode is prepared by the following method:

[0047] (1) Weigh 3g of polyvinyl alcohol and 17g of deionized water, mix, heat and dissolve in a 70°C water bath; add 10 μL of 5wt% boric acid, and stir for 2h in a 70°C water bath; add 15g of PTFE water emulsion with a mass fraction of 60%. Stir at room temperature for 6h;

[0048] (2) Take 15mL of the precursor solution in step (1), connect a 20G (inner diameter 0.60mm) needle, and set the advancing speed of the solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, the rotating speed of the receiving wheel is 200rpm, the ambient temperature is 25°C, the relative humidity is 40%, and the composite fiber membrane is removed after spinning for 10h;

[0049] (3) Put the composite fiber membrane in step (2) in a muffle furnace, pre-oxidize at 280 °C for 1 h, and the heating rate is 2 °C min -1 ; Place the pre-oxidized composite fiber m...

Embodiment 2

[0055] A porous carbon fiber electrode is prepared by the following method:

[0056] (1) Weigh 2g of polyvinyl alcohol and 18g of deionized water, mix, heat and dissolve in a 70°C water bath, add 2.5g of lignin, continue heating and stirring for 10h; add 13.5g of PTFE water emulsion with a mass fraction of 60%, and Stir for 6h;

[0057] (2) Take 15mL of the precursor solution in step (1), connect a 20G (inner diameter 0.60mm) needle, and set the advancing speed of the solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, the rotating speed of the receiving wheel is 200rpm, the ambient temperature is 25°C, the relative humidity is 40%, and the composite fiber membrane is removed after spinning for 10h;

[0058] (3) Put the composite fiber membrane in step (2) in a muffle furnace, pre-oxidize at 280 °C for 1 h, and the heating rate is 2 °C min -1 ; Place the pre-oxidized composite fiber membrane under a nitroge...

Embodiment 3

[0062] A porous carbon fiber electrode is prepared by the following method:

[0063] (1) Weigh 2g of polyvinyl alcohol and 18g of deionized water, mix, heat and dissolve in a water bath at 70°C, add 2.5g of lignin, continue heating and stirring for 10h; add 5g of PTFE water emulsion with a mass fraction of 60%, and Stir for 6h;

[0064] (2) Take 15mL of the precursor solution in step (1), connect a 20G (inner diameter 0.60mm) needle, and set the advancing speed of the solution to 1.0mL h -1 , the electrospinning voltage is 17kV, the distance from the needle to the receiving end is 20cm, the rotating speed of the receiving wheel is 200rpm, the ambient temperature is 25°C, the relative humidity is 40%, and the composite fiber membrane is removed after spinning for 10h;

[0065] (3) Put the composite fiber membrane in step (2) in a muffle furnace, pre-oxidize at 280 °C for 1 h, and the heating rate is 2 °C min -1 ; Place the pre-oxidized composite fiber membrane under a nitroge...

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Abstract

The invention provides a porous carbon fiber electrode for a flow battery and a preparation method of the porous carbon fiber electrode, and relates to the technical field of flow batteries. The porous carbon fiber electrode is prepared by the following method comprising the steps that S1, a water-soluble high-molecular polymer is dissolved in water to obtain a polymer solution; S2, a pore-formingagent is added into the polymer solution, and uniform mixing is conducted to obtain an electrostatic spinning stock solution; S3, electrostatic spinning is conducted by adopting the electrostatic spinning stock solution to obtain a composite fiber membrane consisting of carbon fiber yarns; and S4, the composite fiber membrane is pre-oxidized, and is carbonized in an inert gas atmosphere to obtainthe porous carbon fiber electrode. The carbon fiber electrode not only has a large fiber diameter, but also has nanoscale mesopores and micropores, so that it is ensured that the electrode has a large specific surface area while having good transmission performance, reaction active sites are increased, the activation loss of the battery can be reduced, and the overall performance of the flow battery is improved.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to a porous carbon fiber electrode for a liquid flow battery and a preparation method thereof. Background technique [0002] The energy storage system with high power density is the development direction and trend of energy storage technology in the future. In order to realize the high-efficiency operation of the battery at high current density, it is necessary to further improve the key components of the battery. Taking the flow battery as an example, it is necessary to further reduce the activation polarization, ohmic polarization and concentration polarization of the battery, among which the specific surface area of ​​the electrode material needs to be greatly increased to reduce the activation polarization of the battery. At present, the electrode materials used in flow batteries are mainly graphite felt, carbon paper and carbon cloth. These commercial carbon mate...

Claims

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Application Information

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IPC IPC(8): D04H1/4382D04H1/4242D06C7/04D01D5/00D01F9/17D01F9/21H01M4/86H01M4/88H01M4/96
CPCD04H1/4382D04H1/4242D06C7/04D01D5/003D01D5/0069D01D5/0092H01M4/8803H01M4/96H01M4/8605D01F9/21D01F9/17Y02E60/50
Inventor 赵天寿孙静范新庄
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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