Patent ID: 8741483

Claim:
A positive electrode active material for non-aqueous electrolyte secondary battery, wherein particles of at least one compound selected from erbium hydroxide, erbium oxyhydroxide, ytterbium hydroxide, ytterbium oxyhydroxide, terbium hydroxide, terbium oxyhydroxide, dysprosium hydroxide, dysprosium oxyhydroxide, holmium hydroxide, holmium oxyhydroxide, thulium hydroxide, thulium oxyhydroxide, lutetium hydroxide, and lutetium oxyhydroxide are uniformly dispersed and adhered on an entire surface of a positive electrode active material particle containing lithium, wherein the positive electrode active material is prepared by adding a solution of salt selected from erbium salt, ytterbium salt, terbium salt, dysprosium salt, holmium salt, thulium salt and lutetium salt to a solution dispersing the positive electrode active material particle and depositing a hydroxide selected from erbium hydroxide, ytterbium hydroxide, terbium hydroxide, dysprosium hydroxide, holmium hydroxide, thulium hydroxide and lutetium hydroxide on the surface of the positive electrode active material particle; and heat-treating the positive electrode active material particle depositing the hydroxide on the surface, wherein a pH of the solution dispersing the positive electrode active material particle is 6 to 10; and wherein the positive electrode active material particle containing lithium is at least one compound selected from a positive electrode active material particle containing lithium having at least one element selected from nickel and cobalt, and lithium manganese oxide having spinal structure.