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Electrolyte capable of improving hydroxy-anthraquinone solubility in anthraquinone redox flow battery and preparation method for electrolyte

An anthraquinone liquid flow electricity, hydroxyanthraquinone technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of low solubility and limit the commercial application of flow batteries, and achieve high solubility and excellent charge and discharge. performance effect

Inactive Publication Date: 2017-10-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional potassium hydroxide electrolyte, the solubility of hydroxyanthraquinone is not high, which greatly limits the commercial application of this flow battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 2 grams of tetramethylammonium chloride to 20 milliliters of 2 mol / L potassium hydroxide solution, add 6 grams of 1,4-dihydroxyanthraquinone and heat to 60 degrees Celsius. The solution was used as an anthraquinone flow battery negative electrode electrolyte, and the battery was charged and discharged. The battery current density can reach a maximum of 0.08A / cm 2 .

Embodiment 2

[0018] Add 2 grams of tetraethylammonium chloride to 20 milliliters of 1 mol / L potassium hydroxide solution, add 9 grams of 1,4-dihydroxyanthraquinone, and heat to 70 degrees Celsius. This solution is used as the negative electrode electrolyte of anthraquinone flow battery, and the battery is charged and discharged. The battery current density can reach a maximum of 0.11A / cm 2 .

Embodiment 3

[0020] Add 2 grams of tetrabutylammonium chloride to 20 milliliters of 2 mol / L potassium hydroxide solution, add 5 grams of 2,6-dihydroxyanthraquinone, and heat to 80 degrees Celsius. This solution is used as the negative electrode electrolyte of anthraquinone flow battery, and the battery is charged and discharged. The battery current density can reach a maximum of 0.06A / cm 2 .

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Abstract

The invention discloses an electrolyte capable of improving hydroxy-anthraquinone solubility in an anthraquinone redox flow battery and a preparation method for the electrolyte, and belongs to the fields of energy and chemical industry. The electrolyte comprises deionized water, potassium hydroxide, hydroxy-anthraquinone and tetra alkyl ammonium halide, wherein the hydroxy-anthraquinone is selected from at least one kind of 1, 4-dyhydroxyl anthraquinone, 1, 8-dyhydroxyl anthraquinone, 2, 6-dyhydroxyl anthraquinone and 1, 4, 5, 8-tetrahydroxy anthraquinone; the tetra alkyl ammonium halide is preferably selected from tetraethyl ammonium chloride and tetraethyl ammonium bromide, wherein the adding mass percentage of the tetra alkyl ammonium halide is 0.1-20% of the total weight of the electrolyte. At the room temperature, hydroxy-anthraquinone and tetra alkyl ammonium halide are dissolved into potassium hydroxide at the mass ratio of 1-5 to 1, and steps of stirring and heating are performed to reach 60-90 DEG C to obtain the electrolyte. The hydroxy-anthraquinone is high in solubility in the electrolyte provided by the invention; and in addition, when the electrolyte is used for the anthraquinone redox flow battery, the battery obtains very excellent charging-discharging performance.

Description

technical field [0001] The invention belongs to the field of energy and chemical industry, and relates to a chemical reagent required for improving the solubility of hydroxyanthraquinone electrolyte and a specific preparation method. Background technique [0002] Anthraquinone flow battery is a new type of flow battery, which is mainly composed of negative electrolyte-hydroxyanthraquinone solution, positive electrolyte-potassium ferrocyanide solution, liquid storage tank, bipolar plate, proton exchange membrane and so on. The negative electrode electrolyte—hydroxyanthraquinone solution is an important part of the anthraquinone flow battery, and the concentration of the hydroxyanthraquinone solution directly affects the charge and discharge performance and current density of the anthraquinone flow battery. [0003] Hydroxyanthraquinone is a small molecular organic compound, slightly soluble in water, and turns purple when dissolved in alkaline solutions such as potassium hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 李明强周珊珊
Owner DALIAN UNIV OF TECH
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