VANADIUM REDOX CELL AND METHOD FOR OPERATING SAME

摘要

Provided is a vanadium redox cell and a method for operating the same, the balance of a redox state between a positive electrode and a negative electrode in the vanadium redox cell being adjustable when the redox becomes imbalanced. This vanadium redox cell includes: a negative electrode that includes a vanadium-containing negative-electrode active substance in which the oxidation number changes between bivalency and trivalency; a positive electrode including a vanadium-containing positive-electrode active substance in which the oxidation number changes between tetravalency and pentavalency; a barrier film for partitioning the negative electrode and the positive electrode; a control means for controlling the discharge lower limit voltage between the negative electrode and the positive electrode; and a detection means for detecting an imbalance of the redox state between the positive electrode and the negative electrode. The control means switches the discharge lower limit voltage between the negative electrode and the positive electrode from a first voltage during normal operation to a second voltage lower than the first voltage when an imbalance in the redox state between the positive electrode and the negative electrode is detected by the detection means.