Sulfur-Doped TiO₂ Anchored on a Large-Area Carbon Sheet as a High-Performance Anode for Sodium-Ion Battery

Well-tailored sulfur-doped anatase titanium dioxide nanoparticles anchored on a large-area carbon sheet are designed, where the in situ sulfur-doped titanium dioxide directly comes from titanium oxysulfate and the large-area carbon sheet is derived from glucose. When applied as an anode material for sodium-ion batteries, it exhibits an excellent electrochemical performance including a high capacity [256.4 mA h g^-1 at 2 C (1 C = 335 mA h g^-1) after 500 cycles] and a remarkable rate of cycling stability (100.5 mA h g^-1 at 30 C after 500 cycles). These outstanding sodium storage behaviors are ascribed to the nanosized particles (about 8-12 nm), good electronic conductivity promoted by the incorporation of carbon sheet and sulfur, as well as the unique chemical bond based on the electrostatic interaction.