NOVELTY - The iron flow redox cell comprises: a first half-cell (102) comprising a first electrolyte providing a source of ferrous ion (Fe2+) and an electrode disposed within the first half-cell; a second half-cell (104) comprising a second electrolyte providing a source of Fe2+ ion and ferric ions (Fe3+) and an electrode disposed within the second half-cell; a separator arranged between the first and second half-cells; and a first storage tank (112) arranged external to the first half-cell for circulating the first electrolyte to and from the first half-cell.    USE - The iron flow redox cell is useful in a battery (claimed), which is useful in electric vehicles, an energy transmission grid and power plants.    ADVANTAGE - The iron flow redox cell ensures economic production of the battery with improved coulombic efficiency and round-trip storage efficiency.    DETAILED DESCRIPTION - The iron flow redox cell comprises: a first half-cell (102) comprising a first electrolyte providing a source of ferrous ion (Fe2+) and an electrode disposed within the first half-cell; a second half-cell (104) comprising a second electrolyte providing a source of Fe2+ ion and ferric ions (Fe3+) and an electrode disposed within the second half-cell; a separator arranged between the first and second half-cells; a first storage tank (112) arranged external to the first half-cell for circulating the first electrolyte to and from the first half-cell; and a second storage tank (114) arranged external to the second half-cell for circulating the second electrolyte to and from the second half-cell. The half-cells conduct an oxidation reduction reaction to charge and discharge a battery. The second electrolyte comprises a Fe3+ stabilizing agent (1-5 M). The first electrolyte comprises a hydrogen evolution suppressing agent. The electrode in the first half-cell comprises a slurry comprising electrically conductive particles such as graphite particles, iron particles and/or iron coated particles. The electrically conductive particles have a particle size of 1-1500 microns. The iron flow redox cell has an energy to power ratio of 1:1-3:1, a plating capacity of 150-200 mAh/cm2, a plating efficiency of 60-99%, and a watt-hour efficiency of 40-85%. A temperature of the electrolyte is 20-80 degrees C during operation of the cell. A pH of the first electrolyte is greater than 2.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a flow battery.    First half-cell (102)    Second half-cell (104)    Electrodes (108, 110)    First storage tank (112)    Second storage tank. (114)