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Preparation method of electrolyte for all-vanadium redox flow battery

A liquid flow battery and vanadium oxidation technology, which is applied to fuel cell components, regenerative fuel cells, etc., can solve the problems of long production cycle, high equipment requirements, and high energy consumption, and achieve low cost, simple equipment, and short time consumption Effect

Active Publication Date: 2014-07-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has the disadvantages of long preparation period, high equipment requirements, high energy consumption, and high cost.

Method used

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Examples

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Effect test

preparation example Construction

[0025] The preparation method of the electrolytic solution for the all-vanadium redox flow battery of the present invention, its steps are as follows:

[0026] a, mix the mixture with sulfuric acid, react at 75 to 95°C for 10 to 40 minutes to obtain a mixed solution, wherein the mixture includes vanadium trioxide and vanadium pentoxide, and by mass ratio, vanadium trioxide: pentoxide Divanadium=2.5~4:1;

[0027] b. Add deionized water to the mixed solution obtained in step a, keep the temperature at 75-95° C. for 5-20 minutes, and filter. The obtained filtrate is the electrolyte solution for the all-vanadium redox flow battery. Among them, adding deionized water can dilute the acidity of the solution and the concentration of vanadium ions, so that the solution will not become viscous due to excessive acidity or concentration, and the difficulty of filtration is reduced.

[0028] Further, the mixture in step a is vanadium trioxide and vanadium pentoxide.

[0029] In addition,...

Embodiment 1

[0041] V 2 o 5 : industrial pure

[0042] V 2 o 3 : industrial pure

[0043] h 2 SO 4 : Analytical pure, specific gravity d=1.84

[0044] Prepare 20ml of dilute sulfuric acid with a specific gravity of 1.42 in a three-necked round-bottomed flask, heat the dilute sulfuric acid to 80°C while maintaining a water bath at 90°C, and slowly add 1.25 g V 2 o 5 and 3.75 g V 2 o 3 Add 20ml of deionized water after reacting for 30min, continue water bath for 15min, get the solution and carry out suction filtration, measure the total vanadium ion concentration with ferrous ammonium sulfate titration method to be 1.4569mol L -1 , where the concentration ratio of trivalent vanadium and tetravalent vanadium is 1.0301.

Embodiment 2

[0046] V 2 o 5 : industrial pure

[0047] V 2 o 3 : industrial pure

[0048] h 2 SO 4 : Analytical pure, specific gravity d=1.84

[0049] h 2 o 2 : Analytical pure, specific gravity d=1.04

[0050] Prepare 80ml of dilute sulfuric acid with a specific gravity of 1.42 in a three-neck round bottom flask, heat the dilute sulfuric acid to 80°C while maintaining a water bath at 90°C, and slowly add 4.44 g V 2 o 5 and 15.56 g V 2 o 3 Add 1mL of hydrogen peroxide to react for 30min, then add 80ml of deionized water, continue the water bath for 15min, and filter the solution with suction, and measure and measure the total vanadium ion concentration by ammonium ferrous sulfate titration method to be 1.4708mol L- 1 , where the concentration ratio of trivalent vanadium and tetravalent vanadium is 1.1613.

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Abstract

The invention relates to a preparation method of electrolyte for an all-vanadium redox flow battery, which belongs to the field of the preparation of the electrolyte. The invention aims at solving the technical problem for providing a chemical preparation method of electrolyte for the all-vanadium redox flow battery. The preparation method comprises the following steps of a, mixing a mixture and sulfuric acid to be reacted for 10minutes to 40 minutes at the temperature of 75 to 95 DEG C to obtain a mixed liquid, wherein the mixture contains vanadium trioxide and vanadium pentoxide in a mass ratio of (2.5-4):1; b, adding deionized water into the mixed liquid to be reacted for 5 minutes to 20 minutes at the temperature of 75 to 95 DEG C, and filtering the mixed liquid, wherein the filtered liquid is the electrolyte for the vanadium battery. The preparation method is short in process flow, simple in equipment, short in consumption time, high in utilization rate of raw materials, low in cost and capable of avoiding secondary pollution, the prepared electrolyte is used as a positive and negative electrolyte of the battery, the assembling procedure of the battery can be simplified, and the working efficiency can be increased.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte for an all-vanadium redox flow battery, and belongs to the field of electrolyte preparation. Background technique [0002] With the application of renewable energy such as wind energy and solar energy and the establishment of smart grids, it is urgent to develop efficient, environmentally friendly, and inexpensive energy storage technologies. Vanadium redox flow battery (Vanadium Redox Flow Battery, referred to as vanadium battery) is a new type of green energy storage system. Its electrolyte is a single metal solution. It has long cycle life, flexible design, fast response, deep discharge and maintenance. Advantages of low cost. At present, vanadium batteries are considered to be a promising energy storage technology. The vanadium battery electrolyte is not only an important part of the battery, but also an active material for energy storage. The development of high-quality and low-cost ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/18
CPCY02E60/528H01M8/18Y02E60/50
Inventor 罗冬梅刘维燥曾凡波李丹孟晓玲
Owner SICHUAN UNIV
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