| 초록 |
Highly Ordered Mesoporous Sb-doped SnO2 nanopowders (ATO) were prepared by nano-replication method which is using silica template with simple reagents (SnCl4 and SbCl3). The doping level of Sb in the mesoporous SnO2 could be varied by the experimental conditions. The synthesized mesoporous ATO has high specific surface areas about 90-120 m2/g (calculated by BET equation) and pore size of ~18 nm (calculated by BJH equation). Synthesized samples were analyzed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron micrographs (TEM), N2 adsorption-desorption isotherms, Sheet resistance and X-ray photoelectron spectroscopy (XPS). The prepared samples were tested as anode material for lithium-ion batteries, whose charge-discharge properties, cyclic voltammetry, and cycle performance were examined. The results showed that ATO 5% sample has a high initial discharge capacity of 1103 mAhg-1 and best cycle performance in a potential range of 0.01-3.0V was achieved. The cycle performance is improved due to mesoporous structure and doped Sb particles can perform as a better matrix during Li alloying/de-alloying. |
