Electrolyte solution for redox flow battery and preparation method thereof
A technology of flow battery and electrolyte, applied in the field of electrolyte, to achieve the effect of reducing concentration, inhibiting the generation of sulfur dioxide and hydrogen sulfide, and scientific and reasonable steps
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Embodiment 1
[0045] Add 760mL of pure water to the reactor, slowly add 240mL of sulfuric acid and 11.5g of phosphoric acid under stirring, and when the temperature of the solution is controlled at 95°C, add 2g of V 2 o 5 , when controlling the solution temperature to 90°C, add 66.4g V 2 o 4 , keep stirring until completely dissolved, then add 60g V 2 o 3 , stirred until completely dissolved, and press-filtered through a 0.45 μm filter element. The average valence state of vanadium obtained was 3.5, the concentration of vanadium ions was 1.6 mol / L, the concentration of free sulfate was 2.2 mol / L, and the concentration of phosphoric acid was 0.1 mol / L. The 3.5-valence vanadium electrolyte obtained after dissolution can be activated for the first time, and can be charged and discharged. The detection results of impurity ion content in the 3.5-valence vanadium electrolyte are shown in Table 1.
[0046] Table 1 shows the concentration of impurity element ions in the RF electrolyte (electr...
Embodiment 2
[0060] Add 367mL of pure water to the reactor, slowly add 143mL of sulfuric acid and 5.2g of phosphoric acid under stirring, and when the temperature of the solution is controlled at 95°C, add 2g of V 2 o 5 , when controlling the solution temperature to 90°C, add 41.5g V 2 o 4 , continue to stir until completely dissolved, then add 37.5g V 2 o 3 , stirred until completely dissolved, and press-filtered through a 0.45 μm filter element. The average valence state of vanadium obtained was 3.5, the concentration of vanadium ions was 2 mol / L, the concentration of free sulfate was 2.5 mol / L, and the concentration of phosphoric acid was 0.09 mol / L. The 3.5-valence vanadium electrolyte obtained after dissolution can be activated for the first time, and can be charged and discharged. The detection results of impurity ion content in the 3.5-valence vanadium electrolyte are shown in Table 2.
[0061] The impurity ion content detection result of table 2 embodiment 2 vanadium electrol...
Embodiment 3
[0073] Add 686mL of pure water to the reactor, slowly add 314mL of sulfuric acid and 23g of phosphoric acid under stirring, and when the temperature of the solution is controlled at 95°C, add 2g of V 2 o 5 , when controlling the solution temperature to 90°C, add 124.5g V 2 o 4 , continue to stir until completely dissolved, then add 112.5g V 2 o 3 , stirred until completely dissolved, and press-filtered through a 0.45 μm filter element. The average valence state of vanadium obtained was 3.5, the concentration of vanadium ions was 3 mol / L, the concentration of free sulfate was 1.75 mol / L, and the concentration of phosphoric acid was 2 mol / L. The 3.5-valence vanadium electrolyte obtained after dissolution can be activated for the first time, and can be charged and discharged. The detection results of impurity ion content in the 3.5-valence vanadium electrolyte are shown in Table 3.
[0074] The impurity ion content detection result of table 3 embodiment 3 vanadium electroly...
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