Current collector comprising plurality of projections, electrode, and non-aqueous electrolyte secondary battery comprising the same

摘要

A current collector includes a substrate, a plurality of projections formed on a first portion of the substrate, and at least two adjacent minute projections formed on a second portion of the substrate. The substrate is a metal sheet. The first and second portions are formed on the surface of the substrate. The second portion includes 2 to 100 of minute projections. The minute projections have a height of below 35% of the average height of the plurality of projections. By forming an electrode active material layer on the face of the current collector where the plurality of projections are formed to make an electrode, the detachment of the electrode active material layer, and the spread of the detachment are significantly curbed.