| abstract |
(57) [Problem] To provide an electricity storage device having a high energy density and a low internal resistance by an optimal combination of current collectors. SOLUTION: The positive electrode is configured to include a positive electrode using activated carbon as an electrode active material, a negative electrode using a carbon material capable of absorbing and desorbing lithium ions as an electrode active material, and an electrolyte solution containing lithium ions. A power storage device using an aluminum foil or an aluminum oxide foil as a positive electrode current collector, and using a copper foil or a metal foil whose surface is covered with a copper plating film as a negative electrode current collector constituting a negative electrode. |