Cathode for whole vanadium oxide reduction flow battery and preparation method thereof

A liquid flow battery, vanadium oxidation technology, applied in the field of vanadium batteries, to achieve the effect of improving volume specific energy, excellent mechanical properties and electrochemical properties, good tensile strength and bending strength

Inactive Publication Date: 2005-11-09
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal foil / mesh as a positive electrode material for all-vanadium redox flow batteries can improve mechanical strength, but how to make it resistant to strong acid corrosion and maintain high electrochemical activity is a difficult topic and requires a lot of research work

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation of embodiment 1 electrode (DSA-1) of the present invention

[0017] Prepare the gel according to the conventional sol-gel method: weigh chloroiridic acid, TaCl in a mass ratio of 3:2:1 5 , MgCl 2 The metal salts were dissolved in n-butanol or distilled water, and the solutions of various metal salts were mixed evenly, and NaHCO 3 Adjust the pH value of the solution to 1-3 to obtain a sol. The sol was left for 2 hours to obtain a gel.

[0018] Spray the gel on a 0.5mm metal foil / network with an air spray gun, dry it in a drying oven at 60-100°C, and then spray repeatedly to 10-100μm. After drying, heat treatment at 300-600° C. for 10-70 minutes in a muffle furnace.

[0019] The heat-treated electrode is soaked in 1-2M sulfuric acid for 1-4 hours, taken out, and washed with distilled water to obtain the target electrode.

[0020] With the electrode as the positive electrode, the graphite electrode as the negative electrode, and the N-115 Nafion membra...

Embodiment 2

[0022] Embodiment 2 The preparation of electrode (DSA-2) of the present invention

[0023] Weigh chloroiridic acid and TaCl at a mass ratio of 3:2 5 dissolved in n-butanol, with NaHCO 3 Adjust the pH of the solution. The platinum mesh is used as the positive electrode, the foil or mesh of metal titanium, tin, lead, etc. is used as the negative electrode, and the above-mentioned solution is the electrolyte. at 1-100mA / cm 2 Constant current electrodeposition was carried out at a high current density. The deposition time is 3-30 minutes, determined according to the thickness of the desired deposition layer.

[0024] The electrodeposited foils or meshes of titanium, tin, lead, etc. are washed in distilled water and dried in a drying oven at 60-100°C. After drying, heat treatment at 300-600° C. for 10-70 minutes in a muffle furnace.

[0025] The heat-treated electrode is soaked in 1-2M sulfuric acid for 1-4 hours, taken out, and washed with distilled water to obtain the targe...

Embodiment 3

[0027] Embodiment 3 The preparation of electrode (DSA-3) of the present invention

[0028] Weigh chloroiridic acid and AgNO at a mass ratio of 1:2:2:3 3 , TaCl 5 , MgCl 2 dissolved in n-butanol, with NaHCO 3 Adjust the pH value of the solution to make a colloidal solution required by the conventional electrostatic spraying method, and spray it on the foil or mesh of metal titanium, tin, lead, etc. with an electrostatic spraying device. The spraying time is determined according to the thickness of the desired deposited layer.

[0029] After spraying, the foil or mesh is dried in a drying oven at 60-100°C. After drying, heat treatment at 300-600° C. for 10-70 minutes in a muffle furnace.

[0030] The heat-treated electrode is soaked in 1-2M sulfuric acid for 1-4 hours, taken out, and washed with distilled water to obtain the target electrode.

[0031] The electrochemical and mechanical properties of the 0.51 mm thick DSA-3 electrode were tested according to the method of E...

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Abstract

This invention relates to an electrode used in V oxide liquid flow battery, which takes a metal foil / net as the collector deposited with Ir, Ta, Mg, Co, Ag, Ru, Mn and Fe on the surface. The electrode has high mechanical strength, high non-corrodibility against strong acid and keeps high electrochemical activation. When it has the same thickness with that of carbon conduction plastics, or even thinner, it has even better tensile strength and bending strength, suitable for increasing the volume ratio energy of the battery. Charge, discharge experiment in 2M V electrolyte is carried out taking this invented electrode as the positive, graphite electrode as the negative, N-115 Nafion as the membranes when the current density is set, the voltage efficiency is increased by 10% to that of carbon electrodes.

Description

technical field [0001] The invention relates to an energy storage type liquid flow battery-all-vanadium ion flow battery, which belongs to the field of vanadium batteries. Background technique [0002] Vanadium battery is one of the green storage batteries with strong development momentum at present, and its manufacture, use and disposal process do not produce harmful substances. All-vanadium ion flow battery has high relative electrode potential of ions in different valence states, can be deeply discharged at high current density, charged quickly, and has high energy conversion rate. It can prepare megawatt-level battery packs and provide electric energy with high power for a long time. broad. [0003] The all-vanadium ion flow battery (hereinafter referred to as vanadium battery) uses vanadium-containing solution as the positive and negative active materials, that is, the electrolyte. Complete electronic exchange to realize its charging and discharging. The properties o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/00
Inventor 刘素琴黄可龙张波李林德李晓刚常志峰陈立泉
Owner CENT SOUTH UNIV
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