Patent ID: 8692517

Claim:
An electrical energy storage device comprising an anode cell and a cathode cell, the anode cell comprising an anode electrode and an anode solution electrode and the cathode cell comprising a cathode electrode and a cathode solution electrode, an electrical connection between the anode electrode and the cathode electrode, the electrical connection comprising a DC power source connection and an electrical load connection, a direct electrical connection between the anode solution electrode and the cathode solution electrode, the anode cell containing an anodic reversible redox couple electrolyte comprising ions capable of being oxidised in the anode cell during a charging cycle to form higher oxidation state ions which are capable of being reduced in the anode cell during a discharge cycle, and the cathode cell containing a cathodic reversible redox couple electrolyte comprising ions capable of being reduced in the cathode cell during a charging cycle to form lower oxidation state ions which are capable of being oxidized in the cathode cell during a discharge cycle.