Nonaqueous electrolyte secondary battery and positive electrode active material for nonaqueous electrolyte secondary batteries

A nonaqueous electrolyte secondary battery comprising a positive electrode, a negative electrode and a nonaqueous electrolyte,

• the positive electrode including lithium transition metal oxide particles as a positive electrode active material, the lithium transition metal oxide particles containing nickel as a main transition metal component,
• the lithium transition metal oxide particles being such that a first compound containing at least one element Ma selected from the group consisting of Group IV elements and Group V elements except for titanium is sintered to a portion of the surface of the lithium transition metal oxide particles, the first compound having a composition different from that of the lithium transition metal oxide particles, and
• the positive electrode further including a second compound particle containing Li2WO4,
• wherein an amount of the Li2WO4 in the positive electrode active material, Li2WO4 presented in the second compound/(element Ma present in the first compound+transition metal elements present in lithium transition metal oxide), is in a range of 0.05 mol % to 1.5 mol %,
• wherein the second compound particle is mixed into the positive electrode,
• wherein the second compound particle has a composition different from that of the lithium transition metal oxide particles, and
• wherein the second compound particle containing Li2WO4 is not dissolved in the surface of the lithium transition metal oxide particles, and/or is not diffused into the lithium transition metal oxide particles.