Method for preparing all vanadium ion redox flow battery electrolyte

A liquid flow battery and electrolyte technology, which is applied in chemical instruments and methods, fuel cell parts, secondary batteries, etc., can solve the problems of increasing the electrolyte concentration and stability of vanadium batteries, and achieve good electrochemical reversibility , good stability and easy operation

Active Publication Date: 2008-01-23
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The above methods have failed to significantly improve...

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  • Method for preparing all vanadium ion redox flow battery electrolyte

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Embodiment 1

[0023] 0.02mol ethylenediamine, 0.02mol pyridine, 0.02mol thiazole, 0.2mol KNO 3 , 0.2mol NaNO 3 , 0.02mol EDTA, 1.5mol sulfuric acid were dissolved in 2L deionized water to prepare a composite stabilizer solution. Then weigh 5 mol of vanadyl sulfate, dissolve and dilute it to 1000 mL with a composite stabilizer solution to obtain a 5 mol / L vanadyl sulfate solution. Graphite is used as the positive and negative electrode materials, the concentrations of the positive and negative electrode solutions are 5mol / L vanadyl sulfate and 3mol / L vanadyl sulfate solution, and the charging current density is 11.5mA / cm 2 , the discharge current density is 4mA / cm 2 , the initial discharge voltage is 1.96V, the average discharge voltage is 1.24V, the voltage efficiency is 60%, and the energy efficiency is 75%.

Embodiment 2

[0025] With 0.02mol diethylenetriamine, 0.02mol imidazole, 0.02mol 2-(2,4-diylphenylthio)benzothiazole, 0.2mol LiNO 3 , 0.4mol MgCl 2 , 0.2mol EGTA, 1.5mol sulfuric acid were dissolved in 2L deionized water to prepare a composite stabilizer solution. Then weigh 5 mol of vanadyl sulfate, dissolve and dilute it to 1000 mL with a composite stabilizer solution to obtain a 5 mol / L vanadyl sulfate solution. Graphite is used as the positive and negative electrode materials, the concentrations of the positive and negative electrode solutions are 5mol / L vanadyl sulfate and 3mol / L vanadyl sulfate solution, and the charging current density is 11.5mA / cm 2 , the discharge current density is 4mA / cm 2 , the initial discharge voltage is 1.92V, the average discharge voltage is 1.22V, the voltage efficiency is 60%, and the energy efficiency is 73%.

Embodiment 3

[0027] Weigh 5 mol of vanadyl sulfate, add 800 mL of deionized water, heat, and after it is initially dissolved, add: 0.01 mol of aniline, 0.01 mol of 1,10-phenanthroline, 0.01 mol of furan, 0.1 mol of CaCl 2 , 0.03molNa 2 SO 4 , 0.01mol EDTA, 1.5mol sulfuric acid, continue to stir, after completely dissolving, set the volume to 1000mL to obtain a 5mol / L vanadyl sulfate solution. Graphite is used as the positive and negative electrode materials, the concentrations of the positive and negative electrode solutions are 5mol / L vanadyl sulfate and 3mol / L vanadyl sulfate solution, and the charging current density is 11.5mA / cm 2 , the discharge current density is 4mA / cm 2 , the initial discharge voltage is 1.90V, the average discharge voltage is 1.22V, the voltage efficiency is 60%, and the energy efficiency is 74%.

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Abstract

The present invention relates to a method to produce high concentration full vanadium ion oxidation and reduction liquid flow battery (vanadium battery) electrolyte, which produces 5-6mol/L vanadium battery electrolyte by proportionally adding organic-inorganic compound stabilizing agents. The present invention has the advantages of simple technical method, convenient operation and easy raw material acquisition, produces stable high-concentration vanadium battery electrolyte with excellent electrochemical reversibility and electrical conductivity approximate to conventional 2mol/L electrolyte and realizes battery charge and discharge.

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. Background technique [0002] All-vanadium ion reduction flow battery, referred to as vanadium battery, is a new type of green battery. As a flow battery, its energy is stored in the form of positive and negative electrolytes, and the positive and negative reactions are: [0003] Positive reaction: VO 2 + +2H + +e - →VO 2+ +H 2 O E 0 = 1.00V [0004] Negative reaction: V 3+ +e - →V 2+ E. 0 =-0.26V [0005] The positive and negative electrolytes are each driven by a pump, and reduction and oxidation reactions occur on the electrodes on both sides of the ion exchange membrane, respectively, to complete charge and discharge. Therefore, the electrolyte solution is the core of the flow battery, and its concentration ...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/18H01M10/36H01M12/00H01M14/00B01J19/00
CPCY02E60/528Y02E60/128Y02E60/10Y02E60/50
Inventor 刘建国石冬严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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