Patent ID: 8288032

Claim:
An energy storage device cell comprising: a capacitor cathode including: a capacitor cathode collector foil; and a capacitor cathode electrode layer formed on one face of the capacitor cathode collector foil, the capacitor cathode electrode layer containing microparticles of activated carbon; a first separator; a common anode including: an anode collector foil having a through-hole; and an anode electrode layer formed on one face of the anode collector foil; a second separator; and a battery cathode including: a battery cathode collector foil; and a battery cathode electrode layer formed on one face of the battery cathode collector foil, the battery cathode electrode layer containing particles of a lithium-containing metal compound, wherein the first separator is sandwiched by the capacitor cathode electrode layer and the anode electrode layer, the second separator is sandwiched by the anode collector foil and the battery cathode electrode layer, and the anode collector foil contacts the second separator.