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A kind of multi-diameter size electrode and its preparation method and application

A technology with multiple diameters and sizes, applied in battery electrodes, spinning solution preparation, circuits, etc., can solve problems such as reduced permeability

Active Publication Date: 2021-09-10
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to the nano-scale carbon fiber size, the carbon fiber produced by electrospinning generally has a large specific surface area (10-1000m 2 g -1 ); but at the same time, the permeability of the electrospun carbon electrode is greatly reduced compared with the commercial carbon electrode, so directly using the electrospun carbon fiber electrode in the flow battery will cause a large concentration polarization, which will lead to the battery Can only operate at lower current densities

Method used

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  • A kind of multi-diameter size electrode and its preparation method and application
  • A kind of multi-diameter size electrode and its preparation method and application
  • A kind of multi-diameter size electrode and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A double-diameter electrode prepared by the following method:

[0046] S1. Weigh 2.4g of polyacrylonitrile and 17.6g of N,N-dimethylformamide, mix them, and heat them in a water bath at 70°C for 12h to prepare a 12wt% spinning precursor solution (i.e. spinning solution); another 3g is weighed Polyacrylonitrile and 17g N,N-dimethylformamide were mixed, heated and dissolved in a water bath at 70°C, and prepared into a 15wt% spinning precursor solution;

[0047] S2, take 10mL 12wt% spinning precursor solution in the syringe, and connect a 17G needle (inner diameter 1.07mm), set the advancing speed of the solution to 1mL h -1 ; In addition, take 15mL 15wt% spinning precursor solution, connect a 15G needle (inner diameter 1.40mm), and set the advancing speed of the solution to 1.5mL h -1 . The electrospinning voltage was set to 17kV, the distance from the needle to the receiving end was 20cm, and the rotating speed of the receiving wheel was 200rpm. The ambient temperatur...

Embodiment 2

[0054] A kind of double-diameter electrode, its preparation method is basically the same as embodiment 1, difference is:

[0055] The concentrations of the two electrospinning precursor solutions are 10wt% and 15wt%, respectively, and the corresponding needles during electrospinning are 20G (inner diameter 0.60mm) and 15G (inner diameter 1.40mm) needles, respectively. The advancing speed of the needle corresponds to 1.0mL h -1 , and 1.5mL h -1 . After the same pre-oxidation and carbonization process as in Example 1, an electrode with double diameters can be obtained.

[0056] The fiber filament diameters of the fiber filament groups of the dual-diameter electrode obtained in this example were 500 nm and 10 μm, respectively. After battery test, at 300mA cm -2 Under the current density, the voltage efficiency of the battery is 79.25%, and the energy efficiency is 78.67%.

Embodiment 3

[0058] A kind of three-diameter electrode, its preparation method is basically the same as embodiment 1, difference is:

[0059] With three different concentrations of electrospinning precursor solutions, the concentrations are 5wt%, 10wt% and 15wt%, respectively, and the corresponding needles during electrospinning are 22G (inner diameter 0.40mm), 20G (inner diameter 0.60mm) and 15G (inner diameter 1.40mm). mm) needle. The advancing speed of the needle corresponds to 0.5mL h -1 , 1.0 mL h -1 , and 1.5mL h -1 . Electrodes with three diameters can be obtained through the same pre-oxidation and carbonization as in Example 1.

[0060] The fiber diameters of the fiber groups of the three-diameter electrode obtained in this example were 200 nm, 500 nm and 10 μm, respectively. After battery test, at 300mA cm -2 Under the current density, the voltage efficiency of the battery is 75.48%, and the energy efficiency is 74.82%.

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Abstract

The invention provides a multi-diameter electrode, a preparation method and application thereof, and relates to the technical field of liquid flow batteries. The multi-diameter electrode of the present invention includes carbon fiber filament groups of two or more diameter ranges, the diameter of the fiber filaments is 100nm-20μm, and the diameters of two groups of fiber filaments in adjacent diameter ranges differ by at least 100nm; wherein The diameter size of the fiber filament group with the smallest diameter is 100-1000 nm, and the diameter size of the fiber filament group with the largest diameter is 10-20 μm. The preparation method of the present invention includes the following steps: S1, dissolving polyacrylonitrile in a solvent, and preparing spinning solutions with two or more mass concentrations; S2, performing multi-needle electrospinning on the spinning solutions to obtain multi-diameter A fiber membrane formed by stacking fiber filaments of different sizes; S3, pre-oxidize and carbonize the fiber membrane to form electrodes with multiple diameters. The multi-diameter electrode of the invention has a larger specific surface area, can reduce the activation loss of the battery, increase the permeability, and reduce the concentration polarization of the battery.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to an electrode with multiple diameters and its preparation method and application. Background technique [0002] In response to global climate change, environmental pollution, energy shortage and other issues, solar energy, wind energy and other renewable energy sources have received extensive attention and development. However, these renewable energy power generation has the characteristics of volatility and intermittency, so it is necessary to use large-scale energy storage systems to realize efficient grid connection of renewable energy power generation and realize peak regulation and frequency regulation of the power grid. In recent years, flow batteries have attracted widespread attention as an energy storage system due to their advantages such as no geographical restrictions, independent capacity and power, good safety, and long cycle life. [0003] As one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/96H01M8/18D01D1/02D01D5/00D01F9/22D04H1/43D04H1/728
CPCD01D1/02D01D5/0038D01F9/22D04H1/43D04H1/728H01M4/96H01M8/188Y02E60/50
Inventor 赵天寿孙静范新庄
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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