Electrode manufacturing method, electrode current collector, and electrode

An electrode manufacturing method comprising:

• manufacturing an electrode by:
• forming an active material layer on a surface of an electrode current collector;
• forming a groove portion on a surface of the active material layer;
• and
• peeling off a part of the active material layer, wherein:
• the electrode current collector includes a metal foil and an adhesive layer;
• in planar view, the metal foil includes a first region and a second region;
• the adhesive layer covers the first region;
• the second region is adjacent to the first region;
• in the second region, the metal foil is exposed;
• the active material layer is formed to include a first portion and a second portion;
• the second portion is adjacent to the first portion;
• the first portion covers the adhesive layer;
• the second portion covers the second region;
• the groove portion is formed in each of the first portion and the second portion;
• a part of the groove portion is formed along a boundary between the first portion and the second portion;
• and
• as the part of the active material layer, the second portion is peeled off,
• wherein the part of the groove portion acts as a cut line of the active material layer when the second portion is peeled off.