ELECTRODE, STORAGE ELEMENT, AND LITHIUM ION CAPACITOR

PROBLEM TO BE SOLVED: To realize low resistivity and low heat generating properties of a storage element by providing one having low electric resistance as an electrode using a collector made of perforated foil (metal foil having a plurality of through holes formed in the foil face).SOLUTION: This electrode 8 comprises the collector 2 made of foil-like expanded metal, and an active material layer 3 formed in a portion 22 excluding a region used as an ear portion 23 on both sides of the collector 2. A large number of rhombic through holes are formed in the faces of the collector 2. An A value calculated in the following expression (1): A=( - )/( - ), by resistivity in a direction where resistivity becomes maximum in the face of the collector 2, resistivity in a direction where resistivity becomes minimum, and resistivity in a direction Dalong a line connecting a center of gravity Cof the ear portion 23 and a center of gravity Cof the active material layer 3 is brought close to 1. In this collector 2, resistivity in a direction Dalong a longer diagonal line LW of a rhombus is minimum, and the direction Dis brought in line with the direction D.