Method for preparing electrolyte for all-vanadium redox flow battery

A liquid flow battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of diaphragm water migration, waste of resources, and various processes, and achieve the effects of simplifying the assembly process, improving work efficiency, and simplifying the preparation process

Inactive Publication Date: 2011-05-25
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of electrolyzing vanadium oxides or compounds, there is a possibility of removing NH during the preparation process. 4 + Difficulties in other impurities, various processes, migration of diaphragm water and waste of resources, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] V 2 O 3 : Metallurgical grade

[0012] V 2 O 3 : Analytical pure

[0013] H 2 SO 4 : Analytically pure, d=1.84

[0014] Mix 7.2g vanadium trioxide and 1g vanadium pentoxide uniformly and add them to 12mL concentrated sulfuric acid, then put them into a tube furnace and calcinate at 170℃ for 2h, then dissolve the calcined product in a 3mol / L sulfuric acid solution , Obtain the electrolyte for all vanadium redox flow battery. Potentiometric titration method was used to analyze the concentration of vanadium ions in the electrolyte, and the concentration ratio of trivalent vanadium to tetravalent vanadium was ≈1.

Embodiment 2

[0016] V 2 O 3 : Metallurgical grade

[0017] V 2 O 3 : Analytical pure

[0018] H 2 SO 4 : Analytically pure, d=1.84

[0019] Mix 10.8g vanadium trioxide and 1.8g vanadium pentoxide evenly and add them to 18mL concentrated sulfuric acid, then put them in a tube furnace and calcinate at 100℃ for 3h, then dissolve the calcined product in a 5mol / L sulfuric acid solution In the process, an electrolyte for an all-vanadium redox flow battery is obtained. Potentiometric titration method was used to analyze the concentration of vanadium ions in the electrolyte, and the concentration ratio of trivalent vanadium to tetravalent vanadium was ≈1.

Embodiment 3

[0021] V 2 O 3 : Metallurgical grade

[0022] V 2 O 3 : Analytical pure

[0023] H 2 SO 4 : Analytically pure, d=1.84

[0024] Mix 21.6g vanadium trioxide and 2.4g vanadium pentoxide uniformly and add them to 36mL concentrated sulfuric acid, then put them in a tube furnace and calcinate at 250℃ for 0.5h, then dissolve the calcined product in 2mol / L sulfuric acid In the solution, an electrolyte for an all-vanadium redox flow battery is obtained. Potentiometric titration method was used to analyze the concentration of vanadium ions in the electrolyte, and the concentration ratio of trivalent vanadium to tetravalent vanadium was ≈1.

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Abstract

The invention provides a method for preparing electrolyte for an all-vanadium redox flow battery, which comprises the following steps of: uniformly mixing vanadium trioxide with vanadium pentoxide according to the weight ratio of 6-9:1, adding the mixture into a certain amount of concentrated sulfuric acid, arranging the mixed solution into a tube furnace, performing calcination at 100 to 250 DEG C, and dissolving a calcination product into 2 to 5 mol/L sulfuric acid solution to obtain the electrolyte for the vanadium battery, wherein each of trivalent vanadium and tetravalent vanadium accounts for 50 percent of the concentration of the total vanadium. The method for preparing the electrolyte is simple, and solves the problems of wasting of resources and secondary pollutions.

Description

Technical field [0001] The invention relates to the field of electrochemistry, in particular to a preparation method of an electrolyte for an all-vanadium redox flow battery. Background technique [0002] In recent years, the world's energy shortage and the increasing environmental pollution have put forward new requirements for new energy technologies and efficient energy storage systems. The all-vanadium redox flow battery is a new type of pollution-free electrochemical energy storage device, which has attracted people's attention because of its long cycle life, flexible design, fast response, deep discharge and low maintenance costs. The electrolyte is the active material of the electrochemical reaction of the all-vanadium redox flow battery and the carrier of electric energy. Its performance has a direct impact on the battery performance. Theoretically the electrolyte can be VOSO 4 It is directly dissolved and prepared, but the cost of this method is higher. The practical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 陈孝娥崔旭梅王军黄载春
Owner PANZHIHUA UNIV
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