METHOD OF MANUFACTURING ELECTROLYTE FOR VANADIUM SECONDARY BATTERY AND APPARATUS THEREOF

摘要

The present invention provides an economic and direct method of manufacturing an electrolyte for a secondary battery using cheap V2O5, in which insoluble pentavalent vanadium is not produced, and an apparatus including the electrolyte. According to the present invention, a sulfuric acid (H2SO4) aqueous solution is inserted in a half cell for oxidation, and a V2O5 dispersion and an H2SO4 aqueous solution are inserted in a half cell for reduction, respectively. Then, a potential is applied to an oxidation electrode and a reduction electrode by voltage of 1.7-2.5 V and current of 20-100 mA/cm2. The application of the potential is conducted by two steps. A trivalent vanadium solution (electrolyte for an anode) and a tetravalent vanadium solution (electrolyte for a cathode) may be economically manufactured by using cheap V2O5 (a pentavalent material) without generating insoluble pentavalent vanadium. [Reference numerals] (AA) Water or sulfuric acid