O3-type cathode material has become a research hotspot for sodium-ion battery due to its high theoretical specific capacity.Ni0.33Fe0.33 Mn0.33(OH)2 precursor is prepared via a coprecipitation method,and then calcined with sodium to obtain O3-NaNi0.33Fe0.33Mn0.33O2 cathode material.The influence of calcination temperature on the phase structure and electrochemical performance of this cathode material is explored.Results show that calcination temperature affects the content of sodium residue on the surface of the cathode material,which in turn affects its electrochemical performance.Within the voltage range of 2.0-4.0 V,NaNi0.33Fe0.33Mn0.33O2 cathode material prepared at 850℃ exhibits the optimal electrochemical performance,its capacity retention rate is 71.08％after 100 cycles at 1 C and its discharge specific capacity is 91.67 mAh·g-1 at 5 C.
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