| 摘要 |
PURPOSE: A device and a method for manufacturing an electrolyte for a vanadium redox flow battery by using electrolysis are provided to manufacture anolyte and catholyte of high purity without secondary treatment for removing impurities as impurities are not generated. CONSTITUTION: A device for manufacturing an electrolyte for a vanadium redox flow battery by using electrolysis includes first, second, and third electrolyzing devices. A method for manufacturing the electrolyte for a vanadium redox flow battery by using electrolysis includes the following steps of: primarily electrolyzing sulfuric acid solution in which sulfuric acid oxide vanadium is dissolved with the first electrolyzing device; secondarily electrolyzing second catholyte obtained in the primary electrolysis process; and discharging and electrolyzing third anolyte and third catholyte obtained in the secondary electrolysis process. [Reference numerals] (AA) Vanadyl sulfate (VOSO_4); (BB) Stirring (sulfuric acid solution); (CC) First electrolysis; (DD) Second electrolysis; (EE) Electrolysis; (FF) Discharge; (GG) Third electrolysis; (HH) Catholyte; (II) Anolyte; (JJ) Cathode: 2VOSO_4 + 2H_2SO_4 + 2e^-→V_2(SO_4)_3 + 2H_2O + SO_4^2-; (KK) Cathode: V_2(SO_4)_3 +2e^-→2VSO_4 + SO_4^2-; (LL) Anode: V_2(SO_4)_3 + 4H_2O→(VO_2)_2SO_4 + 2H_2SO_4 + 4H^+ + 4e^-; (MM) Cathode: V^2+ -> discharging <- charging V^3+ e^-; (NN) Anode: VO_2 ^+ + 2H^+ + e^- -> charging <- discharging VO^2+ + H_2O |
