Patent ID: 8753761

Claim:
A flow battery comprising: a first aqueous electrolyte comprising a first metal ligand coordination compound; a second aqueous electrolyte comprising a second metal ligand coordination compound; a first electrode in contact with said first aqueous electrolyte; a second electrode in contact with said second aqueous electrolyte and a separator disposed between said first aqueous electrolyte and said second aqueous electrolyte; wherein at least one of the first or second metal ligand coordination compound is of the formula M(L1) 3−x−y (L2) x (L3) y m , x and y are independently 0, 1, 2, or 3, such that 3−x−y is not less than zero; m is −5, −4, −3, −2, −1, 0, +1, +2, +3, +4, or +5; and M is Al, Cr, Fe, or Ti; L1, L2, and L3 are each independently ascorbate, a catecholate, a pyrogallate, lactate, gluconate, or citrate; and wherein the first and second metal coordination compounds comprise different non-zero valent metals or metalloids.