▎ 摘　　要

NOVELTY - The secondary battery (100) has an electrode assembly (110) that is provided with a positive electrode (111), a separator (113), and a negative electrode (112) and is accommodated in a battery case together with an electrolyte. The battery case is made of metal. A conductive carbon layer is formed on portion or all of the inner surface of the battery case in contact with the electrolyte. A conductive layer (151-154) is formed with a conductive polymer layer and a conductive epoxy layer. The conductive carbon layer comprises graphene. The metal is selected from the group that comprises aluminum, nickel, stainless steel, copper, iron, bronze and brass. The conductive epoxy layer includes conductive filler that is selected from the group that comprises gold, platinum, silver, copper or nickel metal powder, carbon or carbon fiber, graphite, and composite powder, and an epoxy polymer. USE - Secondary battery such as lithium secondary battery for use in portable device such as portable computer, portable phone and camera. ADVANTAGE - The corrosion of a secondary battery case due to contact with an electrolyte is effectively suppressed. DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the coin-type secondary battery. Secondary battery (100) Electrode assembly (110) Positive electrode (111) Negative electrode (112) Separator (113) Conductive layers (151-154)