REDOX FLOW BATTERY SYSTEM WITH REPLACEABLE BARRIER ELECTROLYTE SOLUTION

A redox flow battery system includes a redox flow battery and an ancillary cell that is fluidly connected to the redox flow battery. The ancillary cell includes a barrier electrolyte chamber containing a barrier electrolyte solution. The ancillary cell is designed to adjust either the state of charge or the pH of first and second electrolyte solutions in the redox flow battery.