NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

This non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes lithium composite oxide particles A and B, which include Ni and Mn. The lithium composite oxide particles A are composed of secondary particles a2, which are agglomerates of primary particles a1, and include at least one of zirconium and boron. The lithium composite oxide particles B are composed of at least one of primary particles b1, which have a larger diameter than the primary particles a1, and secondary particles b2, which are agglomerates of the primary particles b1 and have a smaller diameter than the secondary particles a2. The contained ratio of the lithium composite oxide particles A to the lithium composite oxide particles B by mass is in the range of 8:2 to 4:6.