Hydrogenated TiO2 coated core-shell structure C/Fe3O4@rGO lithium battery anodes

The hydrogenated TiO2 coated core-shell structure C/Fe3O4@rGO (H-TiO2/C/Fe3O4@rGO) composite material with oxygen vacancy defects was prepared by a simple method as high-performance anode material for lithium-ion batteries (LIBs). The volume expansion coefficient of TiO2 in the process of Li+ deintercalation is about 4%, which can alleviate the volume expansion of Fe3O4 during charging and discharging, and improve the stability of the anode material structure. At the same time, the lower conductivity of TiO2 (about 1x10(-12) S center dot m(-1)) is improved by hydrogenation. After 200 cycles, the H-TiO2/C/Fe3O4@rGO specific capacity is 867 mAh center dot g(-1) at a current density of 0.3 A center dot g(-1), and the specific capacity is 505 mAh center dot g(-1) after 700 cycles at a current density of 1 A center dot g(-1), these results is far greater than the theoretical capacity of graphite (372 mAh center dot g(-1)). These findings indicate that the H-TiO2/C/Fe3O4@rGO composite materials may be used as a suitable anode material for LIBs.