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Method for preparing electrolyte of vanadium flow battery

A vanadium redox flow battery and electrolyte technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of heating, insoluble trivalent vanadium oxide, and take a long time to dissolve, and achieve the effect of a simple preparation route

Inactive Publication Date: 2012-05-23
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above needs to use purified solid vanadium trioxide and vanadium pentoxide as raw materials, which takes a long time to dissolve and
In particular, trivalent vanadium oxides are difficult to dissolve in sulfuric acid solutions, and often require heating and take a long time to dissolve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1000ml of 20wt% NaVO 3 Add about 700 ml of a saturated solution of sodium dithionite to the solution at a constant temperature of 100°C, and react for 2 hours. of which NaVO 3 About 1.7 moles, about 0.8 moles of sodium dithionite, sodium dithionite is oxidized into sulfuric acid, and the valency of sulfuric acid is 6 moles of electrons lost per mole. Calculated by reducing pentavalent vanadium to trivalent, the required amount of sodium dithionite is 0.57 moles. Adding more sodium dithionite can prevent the air from oxidizing the reduced low-valence vanadium to high-valence. The precipitate was obtained by centrifugation. Wash the precipitate with deionized water and ethanol in sequence to obtain the target low-valent vanadium oxide. Dilute the concentrated sulfuric acid to a concentration of one to one with the volume of water, take 800 milliliters of one to one sulfuric acid aqueous solution and add 330 milliliters of 20wt% NaVO at a constant temperature of 4...

Embodiment 2

[0029] Take 1000ml of 20wt% NaVO 3 Add 4 g of NaOH solid to the solution at a constant temperature of 60° C., and then add about 150 ml of 4 moles per liter of dihydrazine sulfate solution dropwise, and react for 3 hours. of which NaVO 3About 1.7 moles, dihydrazine dithionate is about 0.6 moles, and dihydrazine dithionate is oxidized to nitrogen gas to lose 8 moles of electrons per mole. Calculated by reducing pentavalent vanadium to trivalent, the required amount of dihydrazine sulfate is 0.425 moles. Adding dihydrazine sulfate can prevent the air from oxidizing the reduced low-valence vanadium to high-valence. The resulting precipitate was separated by centrifugation. Wash the precipitate with deionized water and ethanol in sequence to obtain the target low-valent vanadium oxide. Dilute concentrated sulfuric acid to a concentration of one to one volume of water, take 800 milliliters of one to one sulfuric acid aqueous solution and add 330 milliliters of 20wt% NaVO at a c...

Embodiment 3

[0031] Take 1000ml of 20wt% NaVO 3 The solution was added dropwise with concentrated H at room temperature 2 SO 4 to pH 2. The precipitate was obtained by centrifugation. Deionized water and ethanol were used to wash the precipitate in sequence to obtain the target pentavalent vanadium oxide. Calculated on the basis of 100% vanadium extraction rate, the pentavalent vanadium in the precipitate is about 1.6 moles. Dilute concentrated sulfuric acid to a concentration of 1:3 of water volume, take 500 ml of 1:3 sulfuric acid aqueous solution at a constant temperature of 60°C, add pentavalent vanadium oxide precipitate, slowly add a saturated aqueous solution of sodium metabisulfite until the amount of sodium metabisulfite reaches 1.6 moles . If the soluble reducing agent sodium metabisulfite is used, the required amount of sodium metabisulfite is 0.8 mole, based on the reduction of pentavalent vanadium to tetravalent. Adding more sodium metabisulfite can prevent the air from ...

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PUM

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Abstract

The invention, belonging to the field of electrochemical engineering and industry, particularly relates to a method for preparing an electrolyte of a vanadium flow battery, comprising the following steps: using soluble vanadate or its solution as a raw material, reacting deposits obtained by reducing pentavalent vanadium through adding a reducing agent in a neutral or alkaline solution with vanadate or potassium vanadate in a sulfuric acid solution, or precipitating vanadate in an acid solution and then reacting with the reducing agent in the sulfuric acid solution, to prepare an aqueous solution having a sulfuric acid concentration of 1-6 mol / L and a total vanadium concentration of 1-5 mol / L. The electrolyte can be directly used as the electrolyte of positive and negative electrode of the vanadium flow battery. The method has the advantages of few operation steps, simple process, and stable quality, and is especially suitable for the application of vanadium flow batteries.

Description

technical field [0001] The invention belongs to the field of electrochemical engineering and industrial devices, and in particular relates to a method for preparing an electrolyte for a vanadium redox flow battery, which is used for simple and convenient preparation of an electrolyte suitable for the application of a vanadium redox flow battery. Background technique [0002] Energy is the basis for the survival and development of human society, and the utilization of natural mineral energy to electric energy represents the process of technological development. The rapid development of human society in modern times, especially in the 20th century, has made the conflict between human beings and the natural world more and more intense. Seeking ways of sustainable development and protecting natural resources and the natural environment have become serious challenges in the 21st century. Scientists have proposed the technologies of making full use of resources and minimizing the ...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 程杰文越华曹高萍杨裕生
Owner NO 63971 TROOPS PLA
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