| 摘要 |
PURPOSE: A positive electrode active material is provided to realize high charging voltage and high energy density, to ensure good rechargeable cycle characteristic even under high charging voltage, and to suppress the gas generation within a battery. CONSTITUTION: A positive electrode active material comprises: a complex oxide particle containing at least lithium and one or more transition metals; and a coating layer provided in at least a part of the complex oxide particle, wherein the coating layer contains at least one element M which is different from a principal transition metal constituting the complex oxide particle and which is selected among elements belonging to the Groups 2 to 13, and at least one element X selected among phosphorus (P), silicon (Si) and germanium (Ge), and the element M and the element X show different distribution from each other in the coating layer. |
