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Porous carbon fiber electrode for flow battery and preparation method thereof

A porous carbon fiber, flow battery technology, applied in battery electrodes, fiber processing, fiber chemical characteristics, etc., can solve the problems of porous fiber filaments that are difficult to obtain a uniformly distributed pore structure and cannot contribute specific surface area, etc., to achieve good transmission performance, The effect of reducing activation loss and increasing specific surface area

Active Publication Date: 2022-05-27
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 thereof
  • Porous carbon fiber electrode for flow battery and preparation method thereof
  • Porous carbon fiber electrode for flow battery and preparation method thereof

Examples

Experimental program
Comparison scheme
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 water bath at 70 °C; add 10 μL of 5wt% boric acid, stir in a water bath at 70 °C for 2 hours; Stir at room temperature for 6h;

[0048] (2) Take 15mL of the precursor solution of 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 receiving rotor speed 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 of step (2) in a muffle furnace, pre-oxidize at 280°C for 1h, and the heating rate is 2°C min -1 ;Place the pre-oxidized composite fiber membrane in a nitrogen protective atmosphere, carbonize it at 1300 °C fo...

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 to heat and stir for 10h; add 13.5g of 60% PTFE water emulsion, at room temperature under stirring for 6h;

[0057] (2) Take 15mL of the precursor solution of 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 receiving rotor speed 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) The composite fiber membrane of step (2) is placed in a muffle furnace, pre-oxidized at 280°C for 1 h, and the heating rate is 2°C min -1 ; Put the pre-oxidized composite fiber membrane in a nitrogen protective atmos...

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 70°C water bath, add 2.5g of lignin, continue to heat and stir for 10h; add 5g of 60% PTFE water emulsion, at room temperature Stir for 6h;

[0064] (2) Take 15mL of the precursor solution of 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 receiving rotor speed 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) The composite fiber membrane of step (2) is placed in a muffle furnace, pre-oxidized at 280°C for 1 h, and the heating rate is 2°C min -1 ; Put the pre-oxidized composite fiber membrane in a nitrogen protective atmosphere, carbon...

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Abstract

The invention provides a porous carbon fiber electrode for a flow battery and a preparation method thereof, and relates to the technical field of flow batteries. The porous carbon fiber electrode of the present invention is prepared by the following methods: S1, dissolving the water-soluble polymer in water to obtain a polymer solution; S2, adding a pore-forming agent to the polymer solution, and mixing evenly to obtain an electrospinning stock solution ; S3, performing electrospinning using the above electrospinning stock solution to obtain a composite fiber membrane composed of carbon fiber filaments; S4, pre-oxidizing the above composite fiber membrane, and carbonizing it in an inert gas atmosphere to obtain a porous carbon fiber electrode. The carbon fiber electrode of the present invention not only has a larger fiber diameter, but also has nano-scale mesopores and micropores, which ensures that the electrode has good transmission performance and also has a large specific surface area, increasing reactive sites, and can Reduce the activation loss of the battery and improve the overall performance of the flow battery.

Description

technical field [0001] The present invention relates to the technical field of liquid flow batteries, in particular to a porous carbon fiber electrode for liquid flow batteries 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 efficient operation of the battery under high current density, it is necessary to further improve the key components of the battery. Taking a flow battery as an example, it is necessary to further reduce the activation polarization, ohmic polarization and concentration polarization of the battery. To reduce the activation polarization of the battery, the specific surface area of ​​the electrode material needs to be greatly increased. At present, the electrode materials used in flow batteries are mainly graphite felt, carbon paper and carbon cloth. These commercial carbon materials ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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