High-capacity FeTiO₃/C negative electrode for sodium-ion batteries with ultralong cycle life

The development of electrode materials which improve both the energy density and cycle life is one of the most challenging issues facing the practical application of sodium-ion batteries today. In this work, FeTiO₃/C nanoparticles are synthesized as negative electrode materials for sodium-ion batteries. The electrochemical performance and charge-discharge mechanism of the FeTiO₃/C negative electrode are investigated in an ionic liquid electrolyte at 90 °C. The FeTiO₃/C negative electrode delivers a high reversible capacity of 403 mAh g⁻¹ at a current rate of 10 mA g⁻¹, and exhibits high rate capability and excellent cycling stability for up to 2000 cycles. The results indicate that FeTiO₃/C is a promising negative electrode material for sodium-ion batteries.