Abstract
A solid‐state thin film rechargeable battery has been prepared using a novel efficient technique of "surface complexation method" by which a thin layer of Prussian blue (PB) can be overlaid on a solid polymer electrolyte of Nafion (Nf) as matrix. An electrochemical cell made of the composite PB‐Nf film sandwiched with supporting electrodes was examined on i‐V curves in solid state and for characteristics as a rechargeable battery. The resulting PB‐Nf battery showed good durability in repetitive cycles of charging and discharging and gave the following results: open‐circuit voltage of the unit cell per 160 μm 0.68V, short‐circuit current 0.2–2 mA/cm2 depending upon the water content of the Nf matrix, and an energy density of about 50 Wh/kg.