NOVELTY - An energy storage device comprises an anode (1), a cathode (3), a separator (5), an electrolytic solution containing an aprotic non-aqueous solvent comprising mobile ions, and a region in the anode and/or cathode in which a charge adsorbing/desorbing reaction occurs. The separator electrically separates the anode and cathode from each other, and allows the mobile ions to pass.    USE - For secondary batteries, redox capacitors, and energy device modules used for electric and hybrid vehicles (all claimed), portable information communication equipment (word processors, personal computers, cellular phones), portable equipment (portable copiers, electronic organizers, liquid crystal TVs), household appliances (refrigerators, stereos, washers), industrial applications, and medical instruments.    ADVANTAGE - The energy storage device has excellent input/output characteristics at low temperature, and high energy density. The device is operated without undergoing over-charging or over-discharging.    DETAILED DESCRIPTION - An energy storage device comprises an anode (1), a cathode (3), a separator (5), an electrolytic solution containing an aprotic non-aqueous solvent comprising mobile ions, and a region in the anode and/or cathode in which a charge adsorbing/desorbing reaction occurs. The anode and cathode each have a region where a reaction accompanied by charge exchange occurs. The separator electrically separates the anode and cathode from each other, and allows the mobile ions to pass. INDEPENDENT CLAIMS are included for the following:    (1) secondary battery, which is a coin-shaped or cylindrical battery comprising the energy storage device;    (2) redox capacitor comprising the energy storage device;    (3) energy device module comprising energy storage devices connected in series, parallel or series-parallel, and a control circuit for controlling current and/or voltage of an electric circuit formed by the connection;    (4) electric vehicle comprising the energy storage device module, and an electric motor driven by the power supplied by the module; and    (5) hybrid vehicle comprising the energy storage device module, and an electric motor driven by the power supply by the module and an internal combustion engine.    DESCRIPTION OF DRAWING(S) - The figure shows the partial sectional view of the energy storage device.    anode (1)    cathode (3)    separator (5)    cathode tab (6)    anode tab (7)