Preparation method of electrolyte for vanadium redox battery (VRB)

A technology for all-vanadium redox flow batteries and electrolytes, which is applied in the field of preparation of electrolytes for all-vanadium redox flow batteries, can solve the problems of low solubility, small preparation volume, and difficult purification, and achieve the effect of simple process steps

Inactive Publication Date: 2011-06-29
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the results of research and tests, the applicant believes that the method for electrolytic preparation of vanadium electrolyte proposed in the above-mentioned disclosed patents and articles has the following disadvantages: 1. The solubility of vanadium pentoxide powder in sulfuric acid solution is not large, and the electrolytic reaction speed is relatively slow , needs to be added in batches, which leads to complicated steps; 2. Since the vanadium pentoxide powder is reduced on the surface of the negative electrode, it is necessary to suspend the vanadium pentoxide powder in the solution and contact the negative electrode by means of stirring or nitrogen gas for reduction , which will lead to a small amount of preparation and a long electrolysis time; 3. When the positive electrode electrolyte is a sulfuric acid solution or a mixed solution

Method used

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  • Preparation method of electrolyte for vanadium redox battery (VRB)
  • Preparation method of electrolyte for vanadium redox battery (VRB)
  • Preparation method of electrolyte for vanadium redox battery (VRB)

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Take by weighing 50g of vanadium pentoxide, 125g of 98% sulfuric acid and appropriate amount of distilled water. Add 50g of vanadium pentoxide powder to 165.6g of 98% sulfuric acid, place it on a magnetic heating stirrer, stir at 140°C for 0.5h, filter out a small amount of insoluble vanadium pentoxide, and obtain sulfuric acid and vanadium sulfate the mixed solution 3; get 50ml of this mixed solution and add it into the electrolytic cell 2 without diaphragm, use the direct current constant voltage constant current power supply 1, put the lead plate electrode 4 that is connected with the direct current constant voltage constant current power supply 1 into the place filled with sulfuric acid and In the electrolytic cell 2 without diaphragm of the vanadium sulfate mixed solution 3, a constant current electrolysis method is adopted, and the current density is 300mA / cm 2 After 20 hours of electrolysis, a solution of tetravalent vanadium ions was obtained; the electrolytic s...

Embodiment 2

[0035] Weigh 50g of vanadium pentoxide, 200g of 98% sulfuric acid and appropriate amount of distilled water according to the proportioning ratio. Add vanadium pentoxide powder to 165.6g of 98% sulfuric acid, place it on a magnetic heating stirrer, stir at 120°C for 1 hour, filter out a small amount of insoluble vanadium pentoxide, and obtain a mixture of sulfuric acid and vanadium sulfate Solution 3: Take 50ml of the mixed solution and add it to the electrolytic cell 2 without a diaphragm, use a DC constant voltage and constant current power supply 1, and put the lead plate electrode 4 connected with the DC constant voltage and constant current power supply 1 into a tank containing sulfuric acid and vanadium sulfate In the electrolytic cell 2 without diaphragm of the mixed solution 3, a constant current electrolysis method is adopted, and the current density is 200mA / cm 2, electrolyzed for 19 hours to obtain a solution of tetravalent vanadium ions; the electrolytic solution wa...

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Abstract

The invention relates to a preparation method of an electrolyte for a vanadium redox battery (VRB), wherein the electrolyte for the VRB is prepared by means of an electrolytic process, the electrolyte for the VRB prepared by means of an electrolytic process is a quadrivalent vanadium ion solution, and the preparation method comprises the following basic steps: 1) preparing a mixed solution composed of sulfuric acid and vanadium sulphate, adding vanadium pentoxide powder into a 98% sulfuric acid solution, then heating and stirring, and then diluting with distilled water to prepare a mixed solution comprising sulfuric acid and vanadium sulphate; 2) filtering the mixed solution comprising sulfuric acid and vanadium sulphate to remove a small quantity of insoluble vanadium pentoxide to obtain a mixed solution comprising sulfuric acid and vanadium sulphate, wherein the mixed solution can meet the requirements for the preparation of the quadrivalent vanadium ion solution; and 3) pouring the mixed solution comprising sulfuric acid and vanadium sulphate into an electrolytic cell without a diaphragm to electrolyze to obtain a quadrivalent vanadium ion solution. The preparation method provided by the invention has the advantages that the preparation cost is reduced and the process is simple.

Description

technical field [0001] The invention belongs to the field of energy storage batteries, and in particular relates to a method for preparing an electrolyte for an all-vanadium redox flow battery. Background technique [0002] As far as the applicant knows, the current methods for preparing the electrolyte solution for all-vanadium redox flow batteries mainly include chemical methods and electrolytic methods. The chemical method is to use the oxide or compound of vanadium to produce the electrolyte solution for vanadium battery by heating or adding a certain amount of reducing agent in a certain sulfuric acid solution. The chemical method to prepare the electrolyte solution for vanadium batteries is simple and does not require high equipment, but the disadvantage is that because the vanadium pentoxide and vanadium trioxide required for the preparation of the electrolyte are solid powders, the dissolution rate is slow and the production capacity is low. The addition of reducing...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 李爱魁曾瑜杜忠东陈家宏陈轩恕罗传仙刘飞张杰
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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