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Electrolyte for all-vanadium redox flow battery and preparation method thereof, and all-vanadium redox flow battery including the electrolyte

A technology of all-vanadium redox flow battery and electrolyte, which is applied in the field of electrolyte for all-vanadium redox flow battery and its preparation, and all-vanadium redox flow battery including the electrolyte, which can solve the restriction of liquid flow energy storage system Improve the specific energy and other issues to achieve the effect of high total vanadium concentration, good stability and electrochemical activity

Active Publication Date: 2009-11-04
大力储能技术湖北有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stability of V(II), V(III), and V(IV) increases with the increase of temperature, but V(V) will produce thermal precipitation effect at 40°C and above, so it is used in the electrolysis of all-vanadium redox flow battery The preparation method of the solution is limited by the solubility of vanadium in different valence states in the range of 10°C-40°C. The total vanadium concentration of the electrolyte in the all-vanadium redox flow battery is generally in the range of 2.0mol / L, which restricts the ratio of the liquid flow energy storage system. energy boost

Method used

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preparation example Construction

[0020] In an embodiment of the present invention, the preparation method for the electrolyte solution of the all-vanadium redox flow battery includes the following specific steps: first, the oxide of V-valence vanadium such as V 2 o 5 Etc with a reducing agent such as oxalic acid, hydrogen peroxide, sulfur dioxide, etc. or will such as V 2 o 3 with V 2 o 5 A variety of vanadium oxides are added to a sulfuric acid solution with a concentration of 3.0-9.0mol / L to obtain a positive electrode electrolyte precursor containing vanadium of III valence, namely V(III) or vanadium of IV valence, namely V(IV), or containing IV valence Vanadium is the anode electrolyte precursor of the mixture of V (IV) and V valence vanadium, V (V) or the mixture of III valence vanadium, V (III) and IV valence vanadium, V (IV); and, a vanadium Oxides such as V 2 o 5 or V 2 o 3 Etc. and an optional reducing agent such as oxalic acid, hydrogen peroxide, sulfur dioxide, etc. or such as V 2 o 3 wit...

Embodiment 1

[0027] V with a molar ratio of 1:1 2 o 5 and V 2 o 3 332.0 g of the mixture was dissolved in 1.5 L of sulfuric acid aqueous solution with a temperature of 60 °C and a concentration of 3.0 mol / L, and filtered while hot to obtain a mixture containing V(IV) and V(V) with a total vanadium concentration of 2.7 mol / L catholyte precursor.

[0028] V with a molar ratio of 1:2 2 o 5 and V 2 o 3 241.0 g of the mixture was dissolved in 1.0 L of sulfuric acid aqueous solution with a temperature of 60 °C and a concentration of 0.05 mol / L, and filtered while it was hot to obtain a mixture containing V(IV) and V(III) with a total vanadium concentration of 3.0 mol / L negative electrode electrolyte precursor.

[0029] Place the above-mentioned positive electrode electrolyte precursor and negative electrode electrolyte precursor in an electrolytic cell separated by an ion exchange membrane, use a platinum-plated titanium mesh as the positive electrode, and use carbon materials such as gr...

Embodiment 2

[0031] Weigh 182.0g of V 2 o 5 Mix evenly with 360.0g of oxalic acid, then dissolve in 1000.0mL sulfuric acid aqueous solution with a temperature of 90°C and a concentration of 3.0mol / L, and filter while hot to obtain a total vanadium concentration of 2.0mol / L containing V(IV) The anode electrolyte precursor of the mixture of V(III).

[0032] Weigh 182.0g of V 2 o 5 Dissolve in 500.0 mL of sulfuric acid aqueous solution with a concentration of 9.0 mol / L, heat to 90°C, and slowly add 250 mL of hydrogen peroxide with a concentration of 20.0% dropwise. Stir to V 2 o 5 Completely dissolved to obtain a positive electrode electrolyte precursor with a total vanadium concentration of 4.0 mol / L.

[0033] Place the above-mentioned positive electrode electrolyte precursor and negative electrode electrolyte precursor in an electrolytic cell separated by an ion exchange membrane, use a platinum-plated titanium mesh as the positive electrode, and use carbon materials such as graphite ...

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Abstract

The invention provides an electrolyte for an all-vanadium redox flow battery and a preparation method thereof, and an all-vanadium redox flow battery including the electrolyte. The electrolyte for an all-vanadium redox flow battery comprises anode electrolyte and cathode electrolyte which contain vanadiferous ions and sulfate ions, concentration of the sulfate ions in the anode electrolyte is more than that of the sulfate ions in the cathode electrolyte, the total vanadium concentration of the anode electrolyte and the cathode electrolyte is 2.0-8.0mol / L respectively. The preparation method of the electrolyte for an all-vanadium redox flow battery comprises the following steps: dissolving one or more vanadium oxides and optional reducers in sulfuric acid solution with a first concentration and a second concentration respectively to obtain an anode electrolyte precursor and a cathode electrolyte precursor with the total vanadium concentration of 2.0-8.0mol / L respectively, wherein, the first concentration is larger than the second concentration; and electrolyzing the anode electrolyte precursor and the cathode electrolyte precursor respectively to obtain the anode electrolyte and the cathode electrolyte of the all-vanadium redox flow battery.

Description

technical field [0001] The present invention relates to an electrolyte solution for an all-vanadium redox flow battery and a preparation method thereof, and an all-vanadium redox flow battery comprising the electrolyte, in particular to a positive electrode electrolyte and an all-vanadium redox flow battery Negative electrode electrolyte solution and its preparation method, and all-vanadium redox flow battery including the positive electrode electrolyte solution and the negative electrode electrolyte solution. Background technique [0002] All-vanadium redox flow battery has the advantages of high energy conversion efficiency, long service life, capacity can be adjusted according to user requirements, high safety and environmental friendliness. one of the most promising approaches. [0003] Different from other chemical power sources, the electroactive substances of the all-vanadium redox flow battery exist in the form of ions or ion associations dissolved in the electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M10/02H01M8/18H01M10/36H01M10/38H01M12/02H01M12/00
CPCY02E60/528Y02E60/128Y02E60/10Y02E60/50Y02P70/50
Inventor 刘素琴黄可龙吴雪文张庆华李虹云刘维维仲晓玲史小虎陈若媛
Owner 大力储能技术湖北有限责任公司
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