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A kind of oriented ordered electrode and its preparation method and application

A directional and electrode technology, applied in battery electrodes, circuits, fuel cells, etc., can solve the problems of uneven distribution of electrolyte in electrodes, large flow resistance and concentration polarization, failure to be effectively solved, etc. The effect of distribution, reduction of flow resistance and concentration polarization, reduction of transport resistance

Active Publication Date: 2022-02-11
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, directly using electrospinning electrodes as electrodes in flow batteries will cause large flow resistance and concentration polarization.
Although some researchers have tried to reduce the flow resistance and improve the uniform distribution of the electrolyte in the electrode by designing the macroscopic geometric structure of the carbon fiber electrode, so far, this problem has not been effectively solved.
In addition, the battery structure with flow channels will lead to uneven distribution of electrolyte in the electrodes, which will lead to excessive local current density and affect the overall performance of the battery.

Method used

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  • A kind of oriented ordered electrode and its preparation method and application
  • A kind of oriented ordered electrode and its preparation method and application
  • A kind of oriented ordered electrode and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0044] An oriented ordered electrode is prepared by the following method:

[0045] (1) Weigh 3g of polyacrylonitrile (PAN) and 17g of N,N-dimethylformamide, mix them, heat and dissolve them in a water bath at 70°C, and prepare a 15wt% spinning precursor solution.

[0046] (2) Take 15mL of 15wt% PAN solution, connect it to a 15G needle (inner diameter 1.40mm), and set the advancing speed of the solution to 1.0mL·h -1 . Set the electrospinning voltage to 17kV, the distance from the needle to the receiving end to 17cm, and the rotating speed of the receiving wheel to 500rpm. The ambient temperature of electrospinning was 25 °C and the relative humidity was 55%. Take it off after spinning for 10 hours.

[0047] (3) Pre-oxidize the removed PAN filaments in a muffle furnace at 250 °C for 2 h, with a heating rate of 1 °C min -1 . The pre-oxidized fiber filaments were carbonized at 1100°C for 1 hour under a nitrogen atmosphere, and the heating rate was 5°C·min -1 .

[0048] The...

Embodiment 2

[0053] A double-layer composite electrode of oriented and ordered carbon fibers and dense carbon fibers is prepared by the following method:

[0054] (1) Weigh 2g of polyacrylonitrile and 18g of N,N-dimethylformamide, mix them, heat and dissolve them in a 70°C water bath, and prepare a 10wt% spinning precursor solution.

[0055] (2) Take 10mL of 10wt% PAN solution, connect 20G (inner diameter 0.60mm), set the advancing speed of the solution to 1.0mL·h -1 . Set the electrospinning voltage to 17kV, the distance from the needle to the receiving end to 20cm, and the rotational speed of the receiving wheel to 100rpm. The ambient temperature of electrospinning was 25 °C and the relative humidity was 40%. Take it off after spinning for 10 hours.

[0056] (3) Pre-oxidize the removed PAN filaments in a muffle furnace at 250 °C for 2 h, with a heating rate of 1 °C min -1 . The pre-oxidized fiber filaments were carbonized at 1100°C for 1 hour under a nitrogen atmosphere, and the hea...

Embodiment 3

[0060] An oriented and ordered electrode with catalyst particles loaded on the surface of fiber filaments is prepared by the following method:

[0061] (1) Weigh 2g of polyacrylonitrile, 1g of manganese nitrate particles and 17g of N,N-dimethylformamide, mix them, heat and dissolve in a water bath at 70°C, and configure PAN(10wt%) / Mn(NO 3 ) 2 (5 wt%) spinning precursor solution.

[0062] (2) Take 10mL of the mixed solution in step 1, connect 20G (inner diameter 0.60mm), and set the advancing speed of the solution to 0.6mL h -1 . Set the electrospinning voltage to 17kV, the distance from the needle to the receiving end to 17cm, and the rotational speed of the receiving wheel to 500rpm. The ambient temperature of electrospinning was 25 °C and the relative humidity was 55%. Take it off after spinning for 10 hours.

[0063] (3) Pre-oxidize the removed PAN filaments in a muffle furnace at 250 °C for 2 h, with a heating rate of 1 °C min -1 . The pre-oxidized fiber filaments w...

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Abstract

The invention provides an oriented ordered electrode, a preparation method and application thereof, and relates to the technical field of liquid flow batteries. The oriented and ordered electrode of the present invention includes a carbon fiber group, and the carbon fiber group includes several oriented carbon fiber filaments and several cross-arranged carbon fiber filaments, wherein the ratio of the number of the oriented carbon fiber filaments to the cross-arranged carbon fiber filaments is 70:30 -95:5; the diameters of the aligned carbon fiber filaments and the cross-arranged carbon fiber filaments are 200nm-20μm. The oriented and ordered electrode of the present invention can greatly reduce fluid transmission resistance, increase the active area of ​​the electrode, and further improve the uniformity of electrolyte distribution in the electrode. The oriented and ordered electrode of the present invention is suitable for redox flow batteries.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to an oriented ordered electrode and its preparation method and application. Background technique [0002] In recent years, with the increasing energy crisis and environmental problems, countries all over the world are vigorously developing new energy power generation, and the proportion of solar energy and wind energy in the total global power generation continues to grow as renewable energy. However, the intermittent and fluctuating characteristics of solar energy and wind energy lead to unstable power output. An energy storage system with a certain scale can overcome the instability of renewable energy power generation and power supply by supplementing and absorbing renewable energy power, thereby improving the stability of wind power and photovoltaic power grid connection. Flow batteries are considered to be one of the main directions of energy storage systems bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M4/88H01M8/18D04H1/43D04H1/728D06C7/04
CPCH01M4/96H01M4/8875H01M8/188D04H1/43D04H1/728D06C7/04Y02E60/50
Inventor 赵天寿孙静范新庄
Owner GUANGZHOU HKUST FOK YING TUNG RES INST