| abstract |
(57) An object of the present invention is to provide a high energy density electric double layer capacitor capable of rapid charge and discharge, having high withstand voltage and excellent charge and discharge cycle durability. SOLUTION: A positive electrode 1 composed of a polarizable electrode and a porous metal. A negative electrode 5 composed of a carbonaceous material in which a carbon material capable of occluding and desorbing Li ions is made to occlude Li ions by a chemical method and / or an electrochemical method and a collector of a porous metal, and a lithium salt. The non-aqueous electrolyte solution 7 containing is used. |