| 摘要 |
PROBLEM TO BE SOLVED: To provide a solution for the problem wherein in the vanadium Redox pro battery, V5+ may have increased temperature, make polymer to be deposited by occurring dehydration condensation reaction if sulfuric acid concentration is low, and V2+, V3+ and V4+ can be extracted with ease if the electrolyte concentration is low. SOLUTION: In the Redox pro cell in which positive electrode and negative electrode being porous carbon electrode of liquid permeability are divided by diaphragm and charge and discharge by oxidation and deoxidation reaction of positive electrode liquid and negative electrode liquid, vanadium concentration of the positive electrode liquid and negative electrode liquid is 0.5 mol/L-8 mol/L, the concentration of sulfuric acid ion is 0.3 mol/L-9 mol/L, and the sulfuric acid ammonium is to be in the positive electrode liquid and/or negative electrode liquid. In accordance with the present invention, the stability of V5+ in the electrolyte can be improved and the extraction of V2+, V3+ and V4+ can be suppressed.
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