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The high-temperature -phase NaMnO2 is a promising material for Na-ion batteries (NIBs) due to its high capacity and abundant resources. However, the synthesis of phase-pure -NaMnO2 is burdensome and costineffective because it needs to be sintered under oxygen atmosphere at high temperature and followed by a quenching procedure. Here we first report that the pure phase can be stabilized by Cu-doping and easily synthesized by replacing a proportion of Mn with Cu via a simplified process includingdoi:10.1088/0256-307x/35/4/048801 fatcat:r2dmz2mdu5gijjawxomnrzdohu