an electric energy storage device includes a first electrode , a gel type ionic conducting polymer electrolyte separator formed on the first electrode , and a second electrode corresponding to the first electrode . the energy storage device has an increased unit storage capacitance and more minimized size by using the gel type ionic conducting polymer electrolyte separator . also , the energy storage device produces a reduced resistance by the gel type ionic conducting polymer electrolyte separator , such that the high frequency response characteristic is improved , the available frequency region is enlarged and the allowable ripple current is increased . a method for manufacturing the electric energy storage device includes the steps of : forming an ionic conducting polymer electrolyte separator including i ) preparing common solvent for an electrolyte and for dissolving polymer and ii ) dissolving polymer at least one selected from the group consisting of polymer of polyacrylate series , polyvinylidenefluoride , copolymer of polyvinylidenefluoride and polymer of polyether series in the common solvent .