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

Electrode used for vanadium redox flow battery and preparation method for electrode

An all-vanadium redox flow battery and electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low voltage efficiency and achieve the effects of improving voltage efficiency, good electrochemical activity, and obvious effects

Active Publication Date: 2012-01-11
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
View PDF3 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the electrodes of all-vanadium redox flow batteries reported in the literature mainly use carbon materials such as graphite plates, graphite felts, carbon felts, etc. Although these materials have good resistance to strong acid corrosion, their voltage efficiency is as low as 81% ( Skyllas-Kazacosm, Grossmith F. Efficient vanadium redox flow cell [J]. J. Electrochem. Soc., 1987, 134(12): 2950-2953.)
Metal foil / mesh as a positive electrode material for vanadium redox flow batteries can improve mechanical strength, but how to maintain high electrochemical activity requires in-depth work

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
  • Electrode used for vanadium redox flow battery and preparation method for electrode
  • Electrode used for vanadium redox flow battery and preparation method for electrode
  • Electrode used for vanadium redox flow battery and preparation method for electrode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of the present invention comprises:

[0026] Pre-surface-treat the metal foil / mesh;

[0027] Mixing the nano-carbon-based electrode material with the conductive agent and the binder in a weight ratio of 90:1-5:1-5;

[0028] The electrode material is deposited on the surface of the current collector to obtain an electrode for an all-vanadium redox flow battery.

[0029] In the present invention, the nano-carbon-based electrode material is one or more of graphene oxide, reduced graphene, carbide, carbon nitride or carbon / metal nitride composite materials; the conductive agent can be acetylene black, Super P, One or more of graphitized carbon fibers and vapor-grown carbon fibers; the binder is polyvinylidene fluoride PVDF, polytetrafluoroethylene PTFE, carboxylated styrene-butadiene latex SBR, sodium carboxymethylcellulose CMC, Nafion solution, etc.

[0030] In the preparation method of the present invention, the deposition method includes electros...

Embodiment 1

[0033] Get 23ml of 98wt% concentrated sulfuric acid and place it in a reaction vessel, keep the temperature at about 0°C with an ice-water bath, mix 1g of commercially available artificial graphite and 1NaNO 3 Add sulfuric acid and stir vigorously for 10min; slowly add 3g KMnO while stirring 4 , while controlling the reaction temperature below 20°C, remove the ice-water bath after the addition; continue to stir the above mixture in a 35°C water bath for 30 minutes, slowly add 46ml of water to raise the temperature to 98°C and keep it for 10 minutes; use warm water at about 50°C Dilute to 140ml, add H 2 o 2 (5wt%), filtered while hot, washed twice with 5wt% hydrochloric acid, and then washed with deionized water until no SO 4 2- Existence; dry the obtained material in a vacuum oven at 50°C for 24 hours, grind to obtain graphene oxide, and the measured specific surface area is 42.7m 2 / g.

[0034] Mix CMC (sodium carboxymethyl cellulose) and water to prepare a 1-3% solution...

Embodiment 2

[0037] The graphene oxide obtained in Example 1 was placed in a tube furnace and heat-treated at 120° C. for 12 hours at a heating rate of 5° C. min to obtain an electrode material. The measured specific surface area was 56.1 m 2 / g.

[0038] Except that the vacuum drying temperature of the electrode was changed to 120° C. for 24 hours, the preparation method was the same as in Example 1. The thickness of the electrode material was measured with a micrometer to be 30 μm. According to the ICP emission spectrum test result, the electrode material accounted for 7wt% of the entire electrode. The battery performance test method is the same as in Example 1, and the results are shown in Table 1.

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
Thicknessaaaaaaaaaa
Specific surface areaaaaaaaaaaa
Sheet thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses an electrode of a vanadium redox flow battery. The electrode is obtained by depositing a nano-carbon-based electrode material in a current collector, wherein the electrode comprises 0.1-10 of the nano-carbon-based electrode material in percentage by weight; the nano-carbon-based electrode material has the thickness of 1-200 mu m; the surface of the nano-carbon-based material comprises oxygen functional groups; the nano-carbon-based electrode material comprises a conductive agent and a bonding agent; the electrode material is deposited on the current collector to serve as an anode; a graphite electrode serves as a cathode; a Nafion117 film serves as a diaphragm; by charging and discharging in 2M vanadium ion electrolyte, under the same test condition, the voltage efficiency is improved by nearly 15 percent compared with the voltage efficiency of the battery which takes a common carbon electrode as the a; and the electrode with high performance is provided for the field of vanadium redox flow battery manufacturing.

Description

technical field [0001] The invention belongs to the field of vanadium redox flow energy storage batteries, and in particular relates to an electrode for an all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] All-vanadium redox flow battery, based on VO 2 + / VO 2 + and V 2+ / V 3+ When the battery is charged and discharged, the electrode reaction process is as follows: [0003] positive electrode V 0 = 0.999V (vs. NHE) (1) [0004] negative electrode V 0 = -0.255V (vs. NHE) (2) [0005] where V 0 is the standard potential of the redox couple relative to the standard hydrogen electrode. [0006] The battery system assembly design is flexible, easy to combine modules, and the storage scale can be large or small; it can respond at high speed and output high power; the battery system is easy to maintain, safe and stable, and environmentally friendly. Large-scale photoelectric conversion systems, energy storage power suppl...

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
IPC IPC(8): H01M4/96H01M4/88
CPCY02E60/50
Inventor 崔光磊韩鹏献王海波刘志宏陈骁姚建华朱玉伟
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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