NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

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Provided is a nonaqueous electrolyte secondary battery which is capable of achieving high capacity and long life by suppressing the structural change of a positive electrode active material at high voltage. The nonaqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material storing and releasing lithium ions, a negative electrode containing a negative electrode active material storing and releasing lithium ions, and a nonaqueous electrolyte. The positive electrode active material is a lithium-cobalt composite oxide containing nickel, manganese, and aluminium and has a rare-earth compound or oxide deposited to a portion of the surface thereof.