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Method for preparing all-vanadium ion redox flow battery electrolyte

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

Active Publication Date: 2012-03-14
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 vinyl sulfonic acid, and 0.5 mol of propynyl sulfonic acid with 2L of deionized water to prepare 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 and add an aqueous solution containing organic acid as a diluent. After all of it is dissolved, pour it into a volumetric flask and dilute to 1000 mL to obtain a 3mol / L vanadyl sulfate solution. Ultrasonic treatment was carried out during the dissolution of vanadyl sulfate, and the treatment time was 60 minutes. Graphite is used as the anode and cathode materials, the concentration of the anode and cathode solutions are both 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%, the Coulomb efficiency is 93%, and t...

Embodiment 2

[0028] Dissolve 0.5 mol of ethyl sulfonic acid, 0.5 mol of allyl sulfonic acid, and 0.8 mol of p-toluene sulfonic acid with 2 L of deionized water to prepare an organic acid-containing aqueous solution. The organic acid is heated during the dissolution process, and the heating temperature is 60°C. Then, weigh 3 mol of vanadyl sulfate and add an aqueous solution containing organic acid as a diluent. After all of it is dissolved, pour it into a volumetric flask and dilute to 1000 mL to obtain a 3mol / L vanadyl sulfate solution. Ultrasonic treatment was carried out during the dissolution of vanadyl sulfate, and the treatment time was 30 minutes. Graphite is used as the anode and cathode materials, the concentration of the anode and cathode 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 Coulomb efficiency is 90%, and the en...

Embodiment 3

[0030] Weigh 3mol vanadyl sulfate, add 800mL deionized water, heat at 80℃, wait for all of them to dissolve, add: 0.5mol ethynylsulfonic acid, 0.5mol m-hydroxybenzenesulfonic acid, 1.5mol p-hydroxybenzenesulfonic acid, continue to stir After dissolving completely, add deionized water to make the volume to 1000mL to obtain a 3mol / L vanadyl sulfate solution. Ultrasonic treatment was performed during the dissolution of vanadyl sulfate, and the treatment time was 90 minutes. Graphite is used as the anode and cathode materials, the concentration of the anode and cathode solutions are both 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 Coulomb 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 field of battery manufacturing and energy storage, in particular to a method for preparing an electrolyte for an all-vanadium ion redox flow battery (vanadium battery) with high concentration and good stability. 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 batteries, it has the characteristics of fast, large-capacity charging and discharging, low self-discharge rate and simple battery structure. It is suitable for large-scale storage of new energy such as wind and solar energy. The ideal form of power supply. The anode and cathode electrolyte of vanadium battery contains 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. It is the core of energy storage and energy conversion for vanadium...

Claims

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Application Information

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