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Li-ion batteries is the most efficient technology for electrochemical energy storage. However, there are many research devoted to development of sodium-ion batteries due to large abundance and low cost of sodium compared with lithium. O3-type NaNi1/3Fe1/3Mn1/3O2 (111NFM) and related compositions are promising cathode materials for Na-ion batteries due to the high potential of Ni2+/Ni4+-couple and suppression of iron cations migration at desodiated state. NaFe1-x-yNixMnyO2 solid solution materials can deliver 130 mAh g−1 of reversible capacity in a voltage range of 2 – 4 V versus Na+/Na, yet it shows very smooth charge/discharge curves with no significant voltage hysteresis, which may be attributed to stable electrochemical behavior