Electrode for non-aqueous electrolyte solution secondary battery, method of producing electrode and non-aqueous electrolyte solution secondary battery including electrode

An electrode for a secondary battery which is any electrode of positive and negative electrodes of a non-aqueous electrolyte solution secondary battery, the electrode comprising:

• a long sheet-shaped electrode current collector;
• and
• an electrode active material layer formed on the electrode current collector, wherein
• a surface part of the electrode active material layer has a plurality of first grooves extending in a width direction of the electrode current collector and at least one second groove extending in a longitudinal direction of the electrode current collector;
• each of the first grooves is formed to be continuous from one end to another end;
• a region in which the first grooves and the at least one second groove are formed is uniformly divided into three layers, which are an upper layer, an intermediate layer and a lower layer, in a thickness direction from the surface part of the electrode active material layer to the electrode current collector;
• and
• electrode densities (g/cm3) of the upper layer, the intermediate layer and the lower layer of the region in which the first grooves and the at least one second groove are formed are d1, d2, and d3, respectively, and a relationship of 0.8<(d1/d3)<1.1 is satisfied.