Method for preparing all-vanadium ion redox flow battery electrolyte

A flow battery and electrolyte technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of poor stability and low concentration of vanadium battery electrolyte, and achieve the effects of good stability, easy operation and easy availability of raw materials

Active Publication Date: 2014-07-09
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

[0010] The purpose of the present invention is to provide a method for preparing the electrolyte of an all-vanadium ion redox flow battery, which solves the problems of low concentration and poor stability of the vanadium battery electrolyte in the prior art

Method used

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  • Method for preparing all-vanadium ion redox flow battery electrolyte

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Embodiment 1

[0025] Dissolve 0.5 mol of methanesulfonic acid, 0.5 mol of vinylsulfonic acid, and 0.5 mol of propynylsulfonic acid in 2L of deionized water to obtain an aqueous solution containing organic acids. The organic acid is heated during the dissolution process, and the heating temperature is 80°C. Then, weigh 3 mol of vanadyl sulfate, add an aqueous solution containing an organic acid as a diluent, pour it into a volumetric flask after it is completely dissolved, and set the volume to 1000 mL to obtain a 3 mol / L vanadyl sulfate solution. Ultrasonic treatment is carried out during the dissolving process of vanadyl sulfate, and the treatment time is 60 minutes. Graphite is used as the positive and negative electrode materials, the concentration of the positive and negative electrode solutions is 3mol / L vanadyl sulfate and 1.5mol / L organic acid aqueous solution, and the charging current density is 30mA / cm 2 , the discharge current density is 30mA / cm 2 , the voltage efficiency is 85%...

Embodiment 2

[0028] Dissolve 0.5mol ethylsulfonic acid, 0.5mol allylsulfonic acid, and 0.8mol p-toluenesulfonic acid in 2L deionized water to obtain an aqueous solution containing organic acids. The organic acid is heated during the dissolution process, and the heating temperature is 60°C. Then, weigh 3 mol of vanadyl sulfate, add an aqueous solution containing an organic acid as a diluent, pour it into a volumetric flask after it is completely dissolved, and set the volume to 1000 mL to obtain a 3 mol / L vanadyl sulfate solution. Ultrasonic treatment is carried out during the dissolving process of vanadyl sulfate, and the treatment time is 30 minutes. Graphite is used as the positive and negative electrode materials, the concentrations of the positive and negative electrode solutions are 3mol / L vanadyl sulfate and 1.8mol / L organic acid aqueous solution, and the charging current density is 30mA / cm 2 , the discharge current density is 30mA / cm 2 , the voltage efficiency is 83%, the Coulombi...

Embodiment 3

[0030] Weigh 3 mol of vanadyl sulfate, add 800 mL of deionized water, heat at 80°C, and after it is completely dissolved, add: 0.5 mol of acetylene sulfonic acid, 0.5 mol of m-hydroxybenzenesulfonic acid, 1.5 mol of p-hydroxybenzenesulfonic acid, and continue stirring , after completely dissolving, add deionized water to make the volume to 1000mL to obtain 3mol / L vanadyl sulfate solution. Ultrasonic treatment is carried out during the dissolving process of vanadyl sulfate, and the treatment time is 90 minutes. Graphite is used as the positive and negative electrode materials, the concentration of the positive and negative electrode solutions is 3mol / L vanadyl sulfate and 2.5mol / L vanadyl sulfate solution, and the charging current density is 30mA / cm 2 , the discharge current density is 30mA / cm 2 , the voltage efficiency is 87%, the Coulombic efficiency is 93%, and the energy efficiency is 81%.

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Abstract

The invention relates to the battery manufacture and energy storage field, concretely relates to a method for preparing all-vanadium ion redox flow battery (vanadium battery) electrolyte with high density and good stability, which is used for solving the problems of low concentration and poor stability of vanadium battery electrolyte existed in the prior art. The all-vanadium ion redox flow battery electrolyte takes vanadium sulfate, organic acid and water as raw materials, the concentration of vanadium sulfate in the electrolyte is 3mol / L, the concentration of organic acid in the electrolyte is 0.5mol / L-3.5mol / L; wherein organic acid is taken as supporting electrolyte for providing H<+>, and water is taken as a solvent. The method for preparing all-vanadium ion redox flow battery electrolyte has the advantages of simple process, easy operation and easy raw material acquisition, so that vanadium battery electrolyte with high density and good stability can be obtained; the electrolyte has good electrochemical reversibility and high conductivity, and is capable of realizing charge and discharge of battery.

Description

technical field [0001] The invention relates to the fields of battery manufacturing and energy storage, in particular to a method for preparing an electrolyte solution of a high-concentration and stable all-vanadium ion redox flow battery (vanadium battery). Background technique [0002] Vanadium redox flow battery, referred to as vanadium battery. It is a new type of electrochemical energy storage system. Compared with traditional storage batteries, it has the characteristics of fast charging and discharging, large capacity, low self-discharging rate and simple battery structure. It is suitable for large-scale storage of new energy such as wind energy and solar energy. ideal form of power supply. The positive and negative electrolytes of vanadium batteries contain VO 2+ / VO 2+ 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 刘建国秦野严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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