Non-aqueous electrolyte secondary battery, electrode used for secondary battery, and method of manufacturing electrode

A battery electrode comprising:

• a positive electrode and a negative electrode,
• wherein:
• the positive electrode comprises (i) a positive electrode current collector comprising a first metallic foil, (ii) a positive electrode tab comprising the first metallic foil, the positive electrode tab protruding from the positive electrode current collector and being continuous with the positive electrode current collector without a joint, and (iii) a positive electrode active material layer disposed on two surfaces of the positive electrode current collector;
• the negative electrode comprises (i) a negative electrode current collector comprising a second metallic foil, (ii) a negative electrode tab comprising the second metallic foil, the negative electrode tab protruding from the negative electrode current collector and being continuous with the negative electrode current collector without a joint, and (iii) a negative electrode active material layer disposed on two surfaces of the negative electrode current collector and on an area comprising a proximal end part of the negative electrode tab on a negative electrode current collector side;
• and
• a width H1 of the negative electrode active material layer including the area comprising the proximal end part, a width H2 of the negative electrode active material layer or negative electrode current collector at a location other than the negative electrode tab, and a width H3 of the positive electrode current collector or positive electrode active material layer satisfy relationships of H2<H3, and (H1−H2)≧(H3−H2)÷2.