US Patent 7560189 Mixed electrolyte battery

A battery (100B) comprises an electrolyte in which a first element forms a redox pair with a second element, wherein the battery (100B) is charged at a voltage sufficient to plate the first element at the anode (122B) and wherein the voltage is insufficient to plate the second element on the anode (122B). Preferred batteries include secondary batteries comprising a mixed electrolyte that includes a redox pair formed by a first element and a second element.