Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF4 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
lengthaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com