VANADIUM REDOX SECONDARY BATTERY AND METHOD FOR PRODUCING VANADIUM REDOX SECONDARY BATTERY

摘要

Provided are: a vanadium redox secondary battery that has an excellent energy density when inputting/outputting at a high current density, has a long life, and can maintain voltage for a long time; and a method for producing said vanadium redox secondary battery. This battery 1 comprises: a positive electrode material 5 including a positive-electrode active material that includes vanadium ions having an oxidation number changing between pentavalence and tetravalence, or vanadium-containing ions having an oxidation number changing between pentavalence and tetravalence, by an oxidation-reduction reaction; a negative electrode material 6 including a negative-electrode active material that includes vanadium ions having an oxidation number changing between divalence and trivalence, or vanadium-containing ions having an oxidation number changing between divalence and trivalence, by an oxidation-reduction reaction; and a diaphragm 7 that partitions the electrode materials and that lets hydrogen ions pass through. The diaphragm 7 has a volume resistivity of 280 Ω·cm or higher at 1 kHz as measured in a 0.5 M sulfuric acid.