3D Porous γ-Fe2O3@C Nanocomposite as High-Performance Anode Material of Na-Ion Batteries

A simple and template-free method for preparing three-dimensional (3D) porous -Fe2O3@C nanocomposite is reported using an aerosol spray pyrolysis technology. The nanocomposite contains inner-connected nanochannels and -Fe2O3 nanoparticles (5 nm) uniformly embedded in a porous carbon matrix. The size of -Fe2O3 nanograins and carbon content can be controlled by the concentration of the precursor solution. The unique structure of the 3D porous -Fe2O3@C nanocomposite offers a synergistic effect to alleviate stress, accommodate large volume change, prevent nanoparticles aggregation, and facilitate the transfer of electrons and electrolyte during prolonged cycling. Consequently, the nanocomposite shows high-rate capability and long-term cyclability when applied as an anode material for Na-ion batteries (SIBs). Due to the simple one-pot synthesis technique and high electrochemical performance, 3D porous -Fe2O3@C nanocomposites have a great potential as anode materials for rechargeable SIBs.