ELECTRICITY STORAGE DEVICE ELECTRODE AND MANUFACTURING METHOD FOR SAME

An electrode for an electricity storage device (10) of the present invention includes a porous layer (1) having either fibers or whiskers (1a) containing tungsten oxide. A valence band photoelectron spectrum of the fibers or whiskers (1a) obtained by an X-ray photoelectron spectroscopic analysis has a peak within 1 eV from a Fermi level of the tungsten oxide.