Liquid-circulating battery

摘要

The present invention provides a liquid-circulating battery comprising: a positive electrode; a negative electrode; a permeable membrane interposed between said positive and negative poles to hold the same in separated relation to each other and to partition the same into a positive chamber and a negative chambers; two porous carbon electrodes of a liquid-permeable type disposed respectively in said positive and negative chambers; and positive and negative electrolytic solutions, said positive and negative electrolytic solutions being circulated respectively into said positive and negative chambers such that an oxidation-reduction reaction occurs and causes charging and discharging. Said permeable membrane is defined by the following requirement (a), and each of said positive and negative electrolytic solutions is defined by the following requirement (b): (a) an ion-exchange membrane including as an ion exchanger layer a polymeric pellicle which results from crosslinking of a halogenated alkylated product of an aromatic polysulfone type polymer with use of a polyamine and which has an ion exchange capacity of 0.3 to 0.8 (milliequivalent/gram of dry resin) and a thickness 0.1 to 120 mu m, said polysulfone type polymer having as a recurring unit a group represented at least by the following formula (I); and (b) an electrolytic solution having a vanadium ion concentration of 0.5 to 8 mols/liter.