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
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[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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