Multi-dimensional porous electrode applied to flow battery, and preparation method and application of multi-dimensional porous electrode

A liquid flow battery and porous electrode technology, applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of increased electrolyte flow resistance and pump work, reduced electrode permeability, and battery performance deterioration, and is easy to operate , Increase the specific surface area of ​​the electrode and improve the catalytic activity of the electrode

Active Publication Date: 2018-03-30
THE HONG KONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the electrode design of a flow battery, it is necessary to take into account both the electrode activity and the mass transfer characteristics of the electrode, but the specific surface area and the electrode permeability often restrict each other, and it is difficult to improve at the same time.
In general, reducing the carbon fiber diameter can increase the specific surface area of ​​the electrode, but at the same time it will greatly reduce the permeability of the electrode, resulting in a significant increase in the flow resistance of the electrolyte and pump work, deteriorating the performance of the battery.

Method used

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  • Multi-dimensional porous electrode applied to flow battery, and preparation method and application of multi-dimensional porous electrode
  • Multi-dimensional porous electrode applied to flow battery, and preparation method and application of multi-dimensional porous electrode
  • Multi-dimensional porous electrode applied to flow battery, and preparation method and application of multi-dimensional porous electrode

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Embodiment 1

[0038] An embodiment of the present invention is a multi-scale porous electrode applied to a flow battery (the schematic diagram of the structure is shown in figure 1 shown), including a porous electrode skeleton formed by carbon fibers, secondary pores are distributed on the surface of the carbon fibers, and tertiary pores are distributed on the inner surface of the secondary pores. Carbon fiber diameter is 8μm, length is 9mm; secondary hole diameter is 300-500nm, hole depth is 50-100nm, hole spacing is 50-100nm; tertiary hole diameter is 5-10nm, hole depth is 10-30nm, hole spacing 5-10mm (scanning electron microscope photo, scanning electron microscope picture as figure 2 shown).

[0039] The above method for preparing a multi-scale porous electrode applied to a flow battery includes the following steps:

[0040]Using carbon cloth as the initial material, the initial material was placed in an acetone solution containing nickel nitrate (15% by mass), impregnated and ultras...

Embodiment 2

[0042] An embodiment of the present invention is an assembly of an all-vanadium redox flow battery.

Embodiment 3

[0048] An embodiment of the present invention is a multi-scale porous electrode applied to a flow battery, comprising a porous electrode skeleton formed of carbon fibers, secondary pores distributed on the surface of the carbon fibers, and tertiary pores distributed on the inner surface of the secondary pores. Carbon fiber diameter is 9μm, length is 5mm; secondary hole diameter is 400-600nm, hole depth is 80-110nm, hole spacing is 70-110nm; tertiary hole diameter is 5-10nm, hole depth is 10-30nm, hole spacing 5-10mm.

[0049] The preparation method comprises the steps of:

[0050] Using carbon felt as the initial material, the initial material was placed in an aqueous solution containing ferric chloride (25% by mass), impregnated and ultrasonicated for 20 min, and then taken out and dried at 80°C. The obtained material was put into a tube furnace for heat treatment, the atmosphere was a mixture of carbon dioxide and nitrogen, the volume fraction of carbon dioxide was 20%, the...

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Abstract

The invention relates to a multi-dimensional porous electrode applied to a flow battery, and a preparation method and an application of the multi-dimensional porous electrode. The multi-dimensional porous electrode comprises a porous electrode framework formed by carbon fibers through lap jointing, gluing or weaving; second-stage holes are distributed in the surfaces of the carbon fibers; and third-stage holes are distributed in the inner surfaces of the second-stage holes. The multi-dimensional porous electrode can be applied to an all-vanadium redox flow battery; and when the porous electrode is applied to the all-vanadium redox flow battery, the current efficiency of the battery can reach 98% or above, the energy efficiency can reach 89%, the operating current density can reach 200mAcm<-2> or above, and the effective operating time can be more than 500 hours.

Description

technical field [0001] The invention relates to the technical field of flow batteries, in particular to a multi-scale porous electrode applied to flow batteries and its preparation method and application. Background technique [0002] Energy is the basis of human existence and the driving force of social development, and the rational development and utilization of energy has attracted much attention. The extensive use of traditional fossil energy has brought many problems such as environmental pollution and climate change. Vigorously developing renewable energy represented by wind energy and solar energy is an effective way to achieve clean and sustainable energy supply. However, renewable energy has the characteristics of intermittent and fluctuating, which will often cause a greater impact on the power grid and become a bottleneck limiting its large-scale application. The development of grid-level power storage system is an effective way to solve this problem. Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/96H01M8/18
CPCH01M4/861H01M4/8875H01M4/96H01M8/188Y02E60/50
Inventor 赵天寿曾义凯
Owner THE HONG KONG UNIV OF SCI & TECH
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