Facile synthesis of porous Mn_2O_3/TiO_2 microspheres as anode materials for lithium-ion batteries with enhanced electrochemical performance

摘要

In this study, the porous Mn~(2)O~(3)/TiO~(2)microspheres were prepared via a facile two-step hydrothermal method. Firstly, the Mn~(2)O~(3)particles were obtained by the calcination of hydrothermal-synthesized MnCO~(3). Then the TiO~(2)layer was coated on the surface of the Mn~(2)O~(3)particles by a hydrothermal-assisted liquid phase deposition (HA-LPD) method. The as-prepared samples were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM) and Brunauer–Emmett–Teller analyzer (BET), respectively. Moreover, the electrochemical performances of Mn~(2)O~(3)/TiO~(2)as an anode material in lithium ion batteries (LIBs) were also evaluated. The results indicated that, the specific capability of the Mn~(2)O~(3)/TiO~(2)composite material was about 452 mAh g_(−1)at the current density of 500 mA g_(−1)after 200 cycles, which was much higher than that of pristine Mn~(2)O~(3)(313 mAh g_(−1)). Meanwhile, the rate capacity of Mn~(2)O~(3)/TiO~(2)was 177 mAh g_(−1)at the current density of 4 A g_(−1), which was also higher than that of pure Mn~(2)O~(3)(3 mAh g_(−1)). Moreover, the Mn~(2)O~(3)/TiO~(2)composite material can still yield a specific capacity of 800 mAh g_(− 1)at the current density of 1 A g_(−1)after 1000 cycles. The enhanced electrochemical performances of Mn~(2)O~(3)/TiO~(2)composite material was mainly attributed to the synergistic effect between the Mn~(2)O~(3)with high capacity and TiO~(2)with superior stability.