A redox flow battery system is provided with one or more tanks for containing electrolytes. Embodiments of electrolyte tanks include active and/or passive dividers within a single tank structure. Dividers may be configured to prevent mixing of a charged electrolyte and a discharged electrolyte stored within a single tank.
STATEMENT OF FEDERALLY SPONSORED RESEARCH
 Inventions conceived after the filing of the priority application (U.S. patent application Ser. No. 12/498,103, filed on Jul. 6, 2009) that are included in this continuation-in-part patent application were made with Government support under DE-0E0000225 "Recovery Act--Flow Battery Solution for Smart Grid Renewable Energy Applications" awarded by the US Department of Energy (DOE). The Government has certain rights in such inventions. However, the Government does not have rights in U.S. Pat. No. 7,820,321 which was conceived and filed without Government support, nor in the direct continuation and divisional applications thereof.