Facile synthesis of porous Fe2TiO5 microparticulates serving as anode material with enhanced electrochemical performances†
Porous iron titanium oxide (Fe2TiO5) microparticulates have been successfully synthesized via a facile hydrothermal route followed by a subsequent calcination process. Polyvinyl-pyrrolidone (PVP), serving as a surfactant, played a pivotal role in controlling the size and inducing the mesoporous structure of Fe2TiO5. The measured specific surface area is 83.1 m2 g−1 and the dominant pore size is ca. 10 nm. When tested as the anode material of lithium-ion batteries (LIBs), the as-prepared porous Fe2TiO5 microparticulates delivered a high reversible capacity of 468.3 mA h g−1 after 100 cycles at a current density of 100 mA g−1, which nearly quadrupled that of porous TiO2 microspheres and doubled that of Fe2O3 nanoparticles. Moreover, the porous Fe2TiO5 microparticulates also showed more superior rate capability and long-term cycling stability with respect to TiO2 and Fe2O3 samples. Even after the rate performance test, a high discharge capacity of 234.1 mA h g−1 was still maintained at a current density of 500 mA g−1 over another 250 cycles. The improved electrochemical performances are mainly attributed to the synergistic effect of TiO2 and Fe2O3 in Fe2TiO5, as well as the mesoporous structure.