NOVELTY - The capacitor (1) has a positive electrode (11) and a negative electrode (12) laminated in multiple numbers on sides of a separator (13) using lithium salt as electrolyte. The positive electrode makes a positive electrode electrical power collector (11b) to support positive electrode active material mixture (11a). The negative electrode makes a negative electrode electrical power collector (12b) to support negative electrode active material mixture (12a). The power collectors are metal porous bodies of a three-dimensional structure.    USE - Lithium ion capacitor for use as a small backup power supply, an electrical storage device of photovoltaic power generation and an electrical storage system of clean energy by wind power generation for a computer, a hybrid vehicle and an electric vehicle.    ADVANTAGE - The lithium ion can be doped in a quick and uniform manner by supplying lithium ion to along vertical direction with respect to surfaces of the electrodes without drilling to the power collectors.    DETAILED DESCRIPTION - The positive electrode electrical power collector is the metal porous body of the three-dimensional structure containing 50 weight percentage or more of aluminum or 20 weight percentage or more of chromium. The negative electrode electrical power collector is the metal porous body of the three-dimensional structure containing 50 weight percentage or more of copper, 50 weight percentage or more of nickel or 50 weight percentage or more of aluminum. The positive electrode active material mixture has carbonaceous material, which is activated charcoal, carbon nanotube or graphene. The negative electrode active material mixture has carbon material, which carries out occlusion desorption of lithium ion.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a lithium ion capacitor.    Lithium ion capacitor (1)    Positive electrode (11)    Positive electrode active material mixture (11a)    Positive electrode electrical power collector (11b)    Negative electrode (12)    Negative electrode active material mixture (12a)    Negative electrode electrical power collector (12b)    Separator (13)