POSITIVE ELECTRODE ACTIVE MATERIAL AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY USING THE POSITIVE ELECTRODE ACTIVE MATERIAL

The present disclosure provides a positive electrode active material capable of imparting a nonaqueous electrolyte secondary battery with excellent output characteristic and cycle characteristic. The positive electrode active material herein disclosed includes a core part including a lithium composite oxide, a first region formed on at least a partial surface of the core part, and including tungsten (W), and a second region formed on at least a partial surface of the first region, and including titanium (Ti). The W concentration of the first region with TEM-EDX analysis is higher than the W concentration of the core part.