Capital Battery
If the cell voltage of Ph-Fe(CN) 6 battery (1.3 V) was increased to 2 V, the capital cost could drop to the DoE target (from USD$ 168 (kW h) −1) with cost reductions of greater than 40 % for both stacks and electrolytes (Fig. 6 e). On the other hand, most non-aqueous solvents have stability windows of more than 4 V but suitable redox pairs ...