Acid radical detection method for all-vanadium electrolyte

A detection method and electrolyte technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of many manual operations, poor repeatability, slow detection speed of sulfate gravimetric method, etc., and achieve the effect of simple method, low cost and fast measurement speed.

Active Publication Date: 2013-12-18
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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Problems solved by technology

[0008] In order to overcome the shortcomings of the existing schemes in the detection of acid radicals in the electrolyte of vanadium batteries, especially the detection speed of the sulfate radical gravimetric method is slow, there are many manual operations, and the shortcomings of poor repeatability, the present invention proposes a detection method based on acid-base titration

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  • Acid radical detection method for all-vanadium electrolyte
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  • Acid radical detection method for all-vanadium electrolyte

Examples

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Embodiment 1

[0018] Take known V concentration as 1.6mol / l, V 3+ 0.5ml of 0.8mol / l sulfate-containing electrolyte (the remaining V ions are VO 2+ ), add 7ml 50g / l EDTA-2Na solution, add water to 100ml, use Mettler-Toledo T50, acid-base titration electrode, use 0.5037mol / l sodium hydroxide solution as a single breakthrough titration solution, and consume the solution 7.5ml, the sulfate concentration of the solution can be calculated as:

[0019] C SO 4 2 - = ( V NaOH × C NaOH ) / V 0 + C V 2 ...

Embodiment 2

[0021] Take known vanadium concentration as 2.4mol / l, VO 2 + 0.05mol / l vanadium battery electrolyte containing sulfate 0.5ml, add 11ml 50g / l EDTA-2Na solution, add water to 100ml, use Mettler-Toledo T50, acid-base titration electrode, with 0.5037mol / l Sodium hydroxide solution single-jump titration solution consumes 11ml of titration solution, and the sulfuric acid concentration of the solution can be calculated as:

[0022] C SO 4 2 - = V NaOH × C NaOH / V 0 - C VO 2 + 2 ...

Embodiment 3

[0024] Pure VOCl with a known vanadium concentration of 3.95 mol / l 2 Aqueous solution, the content of hydrochloric acid is unknown, take 0.5ml, add 18ml 50g / l EDTA-2Na solution, add water to 100ml, use Mettler-Toledo T50, acid-base titration electrode, use 0.5037mol / l sodium hydroxide solution alone Overcome the titration solution, consume 8.8ml of titration solution, the chloride ion concentration of the solution can be calculated as:

[0025] C C l - = ( V NaOH × C NaOH ) / V 0 + C V 3 + = 8.8 × 0.5037 / ...

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Abstract

The invention relates to an acid radical detection method for all-vanadium electrolyte. Vanadium is complexed by using EDTA (Ethylene Diamine Tetraacetic Acid)-2Na, then the total number of hydrogen ions in a solution is determined by using a sodium hydroxide acid-base titration method, and by calculating, the acid radical content of an original solution can be obtained. The method is used for rapidly and accurately detecting the concentration of acid radicals. The method comprises the following main steps: 1, taking 0.5 ml of an original solution, and determining the concentration of vanadium in the solution and the concentration of vanadium of each valence state by using a redox potential titration method; 2, taking 0.5 ml of the original solution, adding EDTA-2Na into the original solution, wherein the amount of the EDTA-2Na is 1.1-2 times as much as the amount of a vanadium material; 3, by using an acid-base potentiometric titration electrode, titrating the solution by using a sodium hydroxide solution with a known concentration until a first potential is over completely, so that a total concentration of hydrogen ions is obtained; 4, calculating the concentration of original hydrogen ions according to the valence state and concentration of vanadium; and 5, according to the concentration of vanadium ions and the concentration of original hydrogen ions, calculating a total concentration of acid radicals. According to the method provided by the invention, the concentration of acid radicals in a solution can be determined quickly and accurately so as to provide guidance for the production of electrolyte.

Description

technical field [0001] The invention relates to the technical field of material measurement, in particular to an anion indirect detection method of an all-vanadium redox flow battery electrolyte. technical background [0002] As an emerging energy storage battery, vanadium battery has been widely used in the field of new energy in recent years. Electrolyte, as the main energy storage medium, is the main component of vanadium batteries. The concentration of acid radicals will affect the stability, viscosity, and conductivity of the solution, and ultimately affect the efficiency of the battery. Therefore, it is necessary to accurately measure the concentration of acid radicals in the solution for timely adjustment. [0003] In the production process of vanadium electrolyte, it is of practical significance to quickly and effectively detect the concentration of acid radicals in the solution for large-scale mass production of vanadium battery electrolyte. [0004] In the existi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/44
Inventor 宋明明邸卫利刘月菊
Owner DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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