NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

This positive electrode has a positive electrode collector and a positive electrode mixture layer formed on the surface of the positive electrode collector. The positive electrode mixture layer contains a lithium transition metal composite oxide containing 85 mol % or more of Ni and 1-15 mol % inclusive of Al relative to the total number of moles of metal elements other than Li, and in which the total amount of Ni, Al, and Mn contained is 99.9 mol % or more. The density of the positive electrode active material in the positive electrode mixture layer is 3.45 g/cmor higher. In an observation of a cross-section of the positive electrode using a scanning electron microscope, the proportion of the cross-section area of the lithium transition metal composite oxide devoid of cracks relative to the cross-section area of the lithium transition metal composite oxide exposed on the cross-section is 51% or higher.