A METHOD FOR PRODUCING VANADIUM ELECTROLYTE FROM SLIGHTLY SOLUABLE V2O5 BY USING VANADIUM REDOX FLOW BATTERY STACK

摘要

PURPOSE: A manufacturing method of vanadium electrolyte is provided to manufacture vanadium electrolyte from V2O5 by using a Vanadium redox flow battery stack without separate apparatus on the cheap. CONSTITUTION: A manufacturing method of vanadium electrolyte comprises: a step of dissolving V2O5 into a H2SO4 solution-containing positive electrode electrolyte tank(20); a step of generating V3+ by solving Zn and V4+ electrolyte into a H2SO4 solution-containing negative electrode electrolyte tank(19); a step of transferring V5+ electrolyte solved in the positive electrode electrolyte tank to a negative electrode and transferring V3+ electrolyte in the negative electrode electrolyte tank to a positive electrode; a step of generating V4+ by reducing the V5 electrolyte at the negative electrolyte, and by oxidizing V3+ at the positive electrolyte; a step of forming V3+ by transferring V4+ generated at the negative electrode to the positive electrode electrolyte tank, and by transferring V4+ generated at the positive electrode to the negative electrode electrolyte tank; and a step of generating vanadium electrolyte with wanted concentration and composition by dissolving V2O5 into the positive electrode electrolyte tank and dissolving Zn and V3+ into the negative electrode tank.