Redox flow battery

A redox flow battery, comprising:

• an ion-exchange membrane;
• a current collector plate;
• and
• an electrode that is disposed between the ion-exchange membrane and the current collector plate,
• wherein the current collector plate includes a plurality of flow passage networks formed in a surface on the electrode side and through which an electrolytic solution circulates, and
• wherein the plurality of flow passage networks includes liquid inflow passages supplying electrolytic solution to the electrode and liquid outflow passages discharging electrolytic solution to outside of the electrode,
• wherein the electrode includes a main electrode layer having a region in which an electrolytic solution flow from a surface on the current collector plate side to a surface on the ion-exchange membrane side, and
• the region includes a plurality of main electrode pieces which are arranged in parallel in a plane direction,
• wherein the electrode further includes a liquid outflow layer that is disposed on an ion-exchange membrane side of the main electrode pieces and a liquid inflow layer that is disposed between the main electrode layer and the current collector, and
• wherein the liquid inflow layer is in fluid communication with the liquid inflow passages and the outflow layer is in fluid communication with the liquid outflow passages.