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Sodium-deficient O3–Na₀.₉Mn₀.₄Fe₀.₅Ti₀.₁O₂ as a cathode material for sodium-ion batteries

A novel sodium-deficient material O3-type Na₀.₉Mn₀.₄Fe₀.₅Ti₀.₁O₂ has been successfully synthesized for the first time by molten salt method. This material delivers a reversible capacity of about 109 mA h g⁻¹ at 0.1C, and excellent cycling performance with capacity retention of 102 mA h g⁻¹ after 150 cycles. In addition, the NMFTO also demonstrates a good rate capability at various current densities from 0.1C to 5C. Even after a long cycling life up to 400 cycles, the reversible capacity remains as high as 60 mA h g⁻¹ at 5C.