▎ 摘　　要

NOVELTY - Forming an electrode material, comprises: forming a layer including graphene oxide on a first conductive layer; immersing the first conductive layer and a second conductive layer in an electrolyte (415) after forming the layer; and electrochemically reducing at least part of the graphene oxide in the layer on the first conductive layer. USE - The method is useful for forming an electrode material which is used in an electrode, where the electrode is used in a power storage device (all claimed) comprising lithium primary battery, lithium secondary battery, or lithium-ion capacitor and the power storage device is used for supplying electric power to electric appliances including display devices, lighting devices, desktop personal computers and laptop personal computers, image reproduction devices which reproduce still images and moving images stored in recording media comprising digital versatile discs, mobile phones, portable game machines, portable information terminals, e-book readers, video cameras and digital still cameras, high-frequency heating appliances comprising microwave ovens, electric rice cookers and electric washing machines, air-conditioning systems including air conditioners, electric refrigerators, electric freezers, electric refrigerator-freezers, freezers for preserving DNA, and dialyzers. ADVANTAGE - The method provides: electrode material which exhibits high conductivity; and the power storage device with high charge and discharge capacity, high reliability, and high durability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) manufacturing an electrode, comprising forming an active material layer including at least an active material and graphene oxide over a current collector, and electrochemically reducing at least part of the graphene oxide in the active material layer over the current collector; (2) manufacturing a power storage device, comprising forming the electrode as at least one of a positive electrode (405) and a negative electrode (411); (3) a material comprising (a) carbon whose proportion measured by X-ray photoelectron spectroscopy is 80-90%, and oxygen atoms whose proportion measured by X-ray photoelectron spectroscopy is 10-20%, where a proportion of sp2-bonded carbon of the carbon is 50-80%; (4) an electrode material comprising the material; and (5) the power storage device comprising a positive electrode, a negative electrode, an electrolyte and a separator (413), where one or both of the positive electrode and the negative electrode includes the electrode material. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the power storage device. Positive electrode current collector (401) Positive electrode (405) Negative electrode (411) Separator (413) Electrolyte (415)