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Provided is a positive-electrode active material powder or positive electrode that can improve the cycling characteristics of a non-aqueous electrolyte secondary battery that is under high voltage and can demonstrate excellent capacity retention. The positive-electrode active material powder of the present invention has a composition indicated by formula (I), Lix-wNawCo1-yMyO2+z (wherein 0.950≤x≤1.100, 0
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