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Vanadium ion redox flow battery electrolyte, preparation method thereof and battery thereof

A liquid flow battery and electrolyte technology, which is applied in the direction of secondary batteries, regenerative fuel cells, secondary battery components, etc., can solve problems affecting the quality of electrolyte, harsh reaction conditions, high equipment requirements, etc., to reduce losses and hydrogen evolution The effect of increasing the overpotential and reducing the production cost

Active Publication Date: 2010-01-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problem that the method for above-mentioned preparation vanadyl sulfate solution exists is: (1) with elemental sulfur or SO Reduction, these materials itself are not friendly to the environment, with oxalic acid reduction, excessive oxalic acid is difficult to get rid of, so just It will affect the quality of the electrolyte; it needs to be fired at high temperature, the reaction conditions are harsh, and the requirements for equipment are high
Most of the attention is now on the first aspect of stability. For example, the prior art discloses adding some substances in the electrolyte that can make vanadium ions exceed the limit concentration in the electrolyte without precipitation or precipitation, including organic or inorganic substances. substances, liquids or solids; studies on the stability of the second aspect have not been reported

Method used

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preparation example Construction

[0020] The preparation method of the all-vanadium ion flow battery electrolyte of the present invention is characterized in that comprising the following steps:

[0021] (1) After mixing vanadium trioxide and vanadium pentoxide in a certain molar ratio, add them gradually into the concentrated sulfuric acid solution, heat and stir until all the solids are dissolved to form a vanadium-containing solution;

[0022] (2) adding alkaline hydroxide to the vanadium-containing solution of step (1) to adjust to a certain pH value, and filtering; (3) adding additives and soluble in the solution after filtering to improve the solubility and stability of the electrolyte A metal salt of a sulfuric acid system to obtain an electrolyte solution for an all-vanadium redox flow battery.

[0023] Wherein, in step (1), the mol ratio of vanadium trioxide and vanadium pentoxide is 3: 1, and the sulfuric acid concentration in the concentrated sulfuric acid is 6-8mol / l, and the temperature of heating...

Embodiment 1

[0030]Weigh 0.75 mol / l vanadium trioxide and 0.25 mol / l vanadium pentoxide, mix them evenly, add 1000 ml of sulfuric acid aqueous solution with a volume ratio of 7 mol / l, keep stirring at a constant temperature of 80°C, and completely dissolve the solid in 12 hours to obtain The mixed solution of trivalent vanadium and tetravalent vanadium, calcium hydroxide is added to adjust the pH value of the solution to -0.8, and after filtration, the vanadium electrolyte solution with a sulfuric acid concentration of 3mol / l is obtained, and the electrolytic solution is subjected to potentiometric titration analysis. The ratio of seed vanadium concentration is 1:1.02, and the total vanadium concentration is 1.97mol / l. Then add Na 2 SO 4 1.42g, urea 0.6g, absolute ethanol 50ml, glycerin 50ml. Take 100ml of the electrolyte solution on the positive and negative electrodes of the vanadium battery, and add PbSO to the negative electrode electrolyte 4 1.78g.

Embodiment 2

[0032] Weigh 0.75 mol / l vanadium trioxide and 0.25 mol / l vanadium pentoxide, mix them evenly, add 1000 ml of sulfuric acid aqueous solution with a volume ratio of 6 mol / l, keep stirring at a constant temperature of 90°C, and for 11 hours, the solids are completely dissolved. Obtain the mixed solution of trivalent vanadium and tetravalent vanadium, add calcium hydroxide to adjust the pH value of the solution to -0.9, after filtration, just obtain the vanadium electrolyte solution with sulfuric acid concentration of 4mol / l, carry out potentiometric titration analysis to the electrolyte solution, The ratio of the two vanadium concentrations is 1:1, and the total vanadium concentration is 1.99 mol / l. Then add sodium pyrophosphate Na 4 P 2 o 7 2.659g, hydrogen peroxide 0.34g, urea 0.6g. Take 100ml of the electrolyte solution on the positive and negative electrodes of the vanadium battery, and add PbSO to the negative electrode electrolyte 4 1.78g, 7.69g of 3CdSO4.8H2O was adde...

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PUM

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Abstract

The invention provides vanadium ion redox flow battery electrolyte, comprising vandic salt, sulphuric acid, additive, deionized water and metal salt can be dissolved in a sulphuric acid system. The electrolyte can greatly improve the cathode system evolution overpotential of the vanadium battery and anode system evolution overpotential, greatly reduce the ratio of gas evolution in the electrolyte caused by various polarizations in the process of operating the vanadium battery, and improve the stability of the electrolyte in the process of charge and discharge. The invention further provides a preparation method of the vanadium ion redox flow battery electrolyte, which eliminates a step of electrolyzing the obtained vanadyl sulfate solution to obtain 50% of trivalent vanadium and 50% of tetravalent vanadium, greatly simplifies the manufacture technology of the vanadium electrolyte which can be directly used for charging and discharging, reduces the lose of the vanadium in the process of preparation, and reduces the preparation cost of the electrolyte.

Description

technical field [0001] The invention relates to an electrolyte of a liquid flow battery, a preparation method thereof, and a battery, in particular to an electrolyte of an all-vanadium ion flow battery, a preparation method thereof, and a battery using the electrolyte. Background technique [0002] The all-vanadium redox flow battery is a redox flow battery in which the active material is in a cyclic flow state. It was first proposed by the University of New South Wales in Australia. After more than ten years of development, the relevant technologies have become mature, and Japan, the United States, Australia, and Canada have completed their practical research and realized industrial applications. Since the active material of the vanadium battery is stored in the liquid storage tank outside the stack, compared with the traditional solid-phase battery, it has the advantages of small concentration polarization, large battery capacity, easy adjustment, long life, and can withst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M10/02H01M8/18H01M10/36
CPCY02E60/12Y02E60/528Y02E60/50Y02E60/10
Inventor 赵瑞兰丁明明
Owner BYD CO LTD
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