POSITIVE ELECTRODE AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY INCLUDING THE SAME

A positive electrode disclosed herein includes: a positive electrode active material layer containing a first lithium-transition metal composite oxide in a form of secondary particles and a second lithium-transition metal composite oxide in a form of single particles; and a positive electrode current collector. In the first lithium-transition metal composite oxide, a boron compound is placed on the surfaces of the secondary particles, and a porosity of the secondary particles is 2% to 8%. In the second lithium -transition metal composite oxide, an aluminum compound is placed on the surfaces of the single particles. The first and second lithium-transition metal composite oxides each contain nickel at 70 mol% or more relative to the total amount of transition metal elements, and the mass ratio of the first lithium-transition metal composite oxide : the second lithium-transition metal composite oxide is 80 : 20 to 50 : 50.