Positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A positive electrode active material for a nonaqueous electrolyte secondary battery, the positive electrode active material comprising a secondary particle of a lithium transition metal oxide, the secondary particle being formed by coagulation of primary particles of the lithium transition metal oxide;

• secondary particles of a rare earth compound, the secondary particles each being formed by coagulation of primary particles of the rare earth compound;
• and particles of an alkali-metal fluoride,
• the secondary particles of the rare earth compound each being deposited on a groove between a pair of adjacent primary particles of the lithium transition metal oxide, the groove being formed in a surface of the secondary particle of the lithium transition metal oxide, so as to come into contact with both of the pair of adjacent primary particles of the lithium transition metal oxide in the groove,
• the particles of the alkali-metal fluoride being deposited on the surface of the secondary particle of the lithium transition metal oxide.