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
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  • 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% ( Sk

Method used

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  • 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

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Example Embodiment

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

[0026] Surface treatment of metal foil / net in advance;

[0027] Mix 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 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 material; the conductive agent can be acetylene black, Super P, One or more of graphitized carbon fiber and vapor-grown carbon fiber; the binder is polyvinylidene fluoride PVDF, polytetrafluoroethylene PTFE, carboxyl styrene butadiene latex SBR, sodium carboxymethyl cellulose CMC, Nafion solution, etc.

[0030] In the preparation method of the present invention, the deposition method includes electrostatic spraying, ai...

Example Embodiment

[0032] Example 1

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

[0034] Mix CMC (sodium carboxymethyl cellulose) and ...

Example Embodiment

[0036] Example 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 56.1m 2 / g.

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

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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

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Application Information

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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
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