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Application of inorganic acids as additives for improving concentration and stability of vanadium electrolyte solution

A technology of electrolyte concentration and inorganic acid, applied in acidic electrolytes, aqueous electrolytes, circuits, etc., can solve the problems of poor stability of vanadium battery electrolytes, and achieve the effects of easy operation, good stability, and easy availability of raw materials

Inactive Publication Date: 2017-01-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of inorganic acid as the application of improving vanadium electrolytic solution concentration and stability additive, by reducing sulfuric acid concentration in original electrolytic solution, adding other kinds of inorganic acid, both realized improving H + Concentration reduces SO 4 2- Concentration, comprehensively improve the stability of vanadium ions in four valence states, and solve the problem of poor electrolyte stability of vanadium batteries existing in the prior art

Method used

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  • Application of inorganic acids as additives for improving concentration and stability of vanadium electrolyte solution
  • Application of inorganic acids as additives for improving concentration and stability of vanadium electrolyte solution

Examples

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Effect test

Embodiment 1

[0022] Take 1.1mol V 5+ , 1.1mol V 4+ and 2mol H 2 SO 4 Mix the valence electrolyte, add 3mol HBr, stir at room temperature for 30min, pour it into a volumetric flask, and set the volume to 1000mL to obtain 1.1mol V 5+ , 1.1mol V 4+ Mixed valence state vanadium electrolyte. Fill the two glass tubes with 10ml of electrolyte, seal them and place them in a low-temperature test chamber at -10°C and a constant temperature water bath at 50°C. After 6 months of stability testing, there is no precipitation in the electrolyte, as shown in Figure 1 ( a) and Figure 1(b), illustrating that the electrolyte can work within this range.

Embodiment 2

[0024] Take 1.8mol V 5+ and 1mol H 2 SO 4 Electrolyte, add 1mol HNO 3 and 1mol HCl, stirred at room temperature for 30min, poured into a volumetric flask, and set the volume to 1000mL to obtain 1.8mol / L V 5+ vanadium electrolyte. Fill the two glass tubes with 10ml of electrolyte, seal them and place them in a -10°C low-temperature test box and a 50°C constant temperature water bath respectively. After 6 months of stability testing, there is no precipitation in the electrolyte, indicating that the electrolyte can Work within this range.

Embodiment 3

[0026] Take 2.0mol V 4+ and 1mol H 2 SO 4 Electrolyte, add 0.2mol H 3 PO 4 and 1.5mol HCl, stirred at room temperature for 30min, poured into a volumetric flask, and set the volume to 1000mL to obtain 2mol / L V 4+ vanadium electrolyte. Fill the two glass tubes with 10ml of electrolyte, seal them and place them in a -10°C low-temperature test box and a 50°C constant temperature water bath respectively. After 6 months of stability testing, there is no precipitation in the electrolyte, indicating that the electrolyte can Work within this range.

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Abstract

The invention relates to the field of battery manufacturing and energy storage, in particular, relates to an application of inorganic acids as additives for improving the concentration and stability of a vanadium electrolyte solution, and is used for solving the problem of poor stability of a vanadium battery electrolyte solution in the prior art. With the electrolyte solution having a certain vanadium concentration and sulfuric acid concentration as a raw material, inorganic acid with a certain concentration is added in the electrolyte solution; by reducing the concentration of sulfuric acid in an original electrolyte solution, other species of inorganic acids are added; therefore, the H<+> concentration is increased, the concentration of SO4<2-> is decreased, the stability of tetravalence vanadium ions is comprehensively increased, and the electrolyte solution can work in a temperature range of -10 to 50 DEG C. The method has the advantages of simpliness, easy operation, and easily obtained raw materials, and the good-stability vanadium battery electrolyte solution can be obtained.

Description

technical field [0001] The invention relates to the field of battery manufacturing and energy storage, in particular to the application of an inorganic acid as an additive to improve the concentration and stability of vanadium electrolyte. Background technique [0002] All-vanadium redox flow battery (referred to as vanadium battery) is a new type of electrochemical energy storage system. Compared with traditional batteries, it has the characteristics of fast, large-capacity charge and discharge, low self-discharge rate and simple battery structure. It is one of the ideal forms of power supply for large-scale energy storage of new energy sources such as wind energy and solar energy. The positive and negative electrolytes of vanadium batteries contain V 4+ / V 5+ with V 2+ / V 3+ The sulfuric acid solution of the redox couple is not only a conductive medium, but also an electroactive material for energy storage, and is the core of vanadium battery energy storage and energy ...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0011Y02E60/50
Inventor 秦野何虹祥刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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