POWER STORING ELEMENT-USE ELECTRODE, POWER STORING ELEMENT, POWER STORING METHOD

摘要

A negative electrode having both functions as a secondary battery and an electric double-layer capacitor, and permitting free settings of an output density and an energy density. The electrode comprises a conductive substrate, and a conductive material carried on the surface of the conductive substrate and having a gap allowing the intercalation of cations in an electrolyte and a gap allowing contact between the conductive substrate and the electrolyte, wherein no intercalation of cations occurs in the conductive substrate to allow charges to be stored even if a negative voltage that causes the intercalation of cations in the conductive material is applied to the electrode in the electrolyte.