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Preparation method of electrolyte used for all-vanadium redox flow battery

An all-vanadium redox flow battery and electrolyte technology, which is applied in the field of electrolyte preparation for flow batteries, can solve the problems of large power consumption, difficult application and high cost, and achieves a production cost reduction, no environmental pollution, and high production efficiency. Effect

Active Publication Date: 2010-12-15
四川环通电子有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrolyte in this patent application technology does not introduce impurities, the efficiency of cathodic electrolysis is improved by increasing the contact area between the negative electrode and the electrolyte; however, the positive electrode is expensive, the electrolysis process takes a long time, and the power consumption is large. The cost is very high , difficult to apply
[0007] In summary, the preparation method of electrolyte for vanadium-vanadium redox flow battery in the prior art has defects in raw material cost, process route, safety, environment, energy consumption, etc., and it is difficult to popularize and apply

Method used

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  • Preparation method of electrolyte used for all-vanadium redox flow battery
  • Preparation method of electrolyte used for all-vanadium redox flow battery
  • Preparation method of electrolyte used for all-vanadium redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take 5ml of the electrolyte solution in the vanadium battery liquid storage tank, and use potentiometric titration analysis to determine that the oxidation state of vanadium in the electrolyte solution is a single trivalent, the total concentration of vanadium is 1.96mol / L, and the pH is 0.5. 500ml of 2.5mol / L tetravalent vanadium electrolyte is now required.

[0039] According to the formula V 1 =[(5-m 2 )×C 2 ×V 2 ] / [(5-m 1 )×C 1 ];

[0040] n=0.1×(C 2 ×V 2 ×m 2 —C 1 ×V 1 ×m 1 );

[0041] V 3 =V 2 —V 1 ;

[0042] C 3 =0.4×(C 2 ×V 2 ×m 2 —C 1 ×V 1 ×m 1 ) / (V 2 —V 1 );

[0043] calculated V 1 =0.32L, n=0.31mol, V 3 =0.18L, C 3 =7.2 mol / L.

[0044] Fix the 1000ml flask on the magnetic stirrer, take 320ml of electrolyte and put it in the flask, add 58 vanadium pentoxide (analytical pure), 180ml of 7.2mol / L sulfuric acid, stir for 1.5h to get a clear and transparent blue solution. Stand still for 3 hours to separate the electrolyte from impuri...

Embodiment 2

[0047] Get 5ml of electrolyte in the vanadium battery liquid storage tank, adopt potentiometric titration analysis, determine that the valence state of vanadium in the electrolyte is divalent, trivalent, the total oxidation state number is 2.5, the total concentration of vanadium is 1.56mol / L, and the pH is 1.0. Now, 3 liters of electrolytic solution with a molar ratio of trivalent vanadium to tetravalent vanadium of 1, a total number of oxidation states of 3.5, and a total concentration of vanadium of 2.0 mol / L is required.

[0048] According to the formula V 1 =[(5-m 2 )×C 2 ×V 2 ] / [(5-m 1 )×C 1 ]

[0049] n=0.1×(C 2 ×V 2 ×m 2 —C 1 ×V 1 ×m 1 )

[0050] V 3 =V 2 —V 1

[0051] C 3 =[C 2 ×V 2 +0.2×(C 2 ×V 2 ×m 2 —C 1 ×V 1 ×m 1 )] / (V 2 —V 1 );

[0052] calculated V 1 =2.3L, n=1.18mol, V 3 =0.7L, C 3 =9.8 mol / L.

[0053] Fix a 5000ml flask on a magnetic stirrer, put 2300ml of electrolyte in the flask, add 220g (analytical pure) vanadium pentoxide,...

Embodiment 3

[0056] Get 5ml of electrolyte in the vanadium battery liquid storage tank, adopt potentiometric titration analysis, determine that the valence state of vanadium in the electrolyte is divalent, trivalent, the total oxidation state number is 2.15, the total concentration of vanadium is 2.5mol / L, and the pH is 1.25. 3 liters of 2.6mol / L trivalent vanadium electrolyte is now required.

[0057] According to the formula in Example 2, calculate V 1 =2.19L, n=1.16mol, V 3 =0.81L, C 3 = 12.5 mol / L.

[0058] Fix a 5000ml flask on a magnetic stirrer, put 2190ml of electrolyte in the flask, add 237g of vanadium pentoxide (chemically pure), 810ml of 12.5mol / L sulfuric acid, and stir for 0.15h to obtain a clear and transparent dark green solution. Stand still for 1h to separate the electrolyte from impurities.

[0059] Take 5ml of the supernatant, and use potentiometric titration analysis to determine that the valence state of vanadium in the electrolyte is a single trivalent, and the ...

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Abstract

The invention discloses a preparation method of electrolyte used for an all-vanadium redox flow battery. According to the preparation method, vanadium electrolyte, pentavalent vanadium compound and suThe invention discloses a preparation method of electrolyte used for an all-vanadium redox flow battery. According to the preparation method, vanadium electrolyte, pentavalent vanadium compound and sulfuric acid after the discharging of the vanadium battery are mixed in a certain proportion, stirred and fully reacted, and then the electrolyte needed is obtained. The preparation method has the advalfuric acid after the discharging of the vanadium battery are mixed in a certain proportion, stirred and fully reacted, and then the electrolyte needed is obtained. The preparation method has the advantages of cheap reaction materials, mild reaction condition, low energy consumption, simple technique, easy and safe operation, low requirement of equipment and has a good application prospect.ntages of cheap reaction materials, mild reaction condition, low energy consumption, simple technique, easy and safe operation, low requirement of equipment and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrolyte preparation for a flow battery, and in particular relates to a method for preparing an electrolyte for an all-vanadium flow battery. Background of the invention [0002] The all-vanadium redox flow battery is an excellent energy storage system. It has no solid-state reaction, no change in the structure and shape of the electrode material, and is cheap, long-lived, high-reliable, and low in operation and maintenance costs. It can meet the needs of power supply in remote areas. And solve the problem of power grid peak regulation. [0003] High-efficiency energy storage vanadium batteries mainly use all-vanadium ions as the electrolyte, and V(V) / V(IV) and V(III) / V(II) pairs are formed at the positive and negative electrodes during charging and discharging. The rated power and rated energy are independent, the power depends on the battery stack, and the energy depends on the electrolyte. The amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 冯秀丽刘联李晓兵刘效疆
Owner 四川环通电子有限责任公司