Abstract
SnO2 hollow spheres are doped with different contents of Al (1, 1.5, 2at.%) by a one-step hydrothermal reaction. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM) and Brunauer–Emmett–Teller (BET) are utilized to characterize the structures, components, chemical environments, morphologies and specific areas of the as-prepared samples. The investigation in cycling performances demonstrates that 1.5at.% Al-doped SnO2 hollow spheres exhibit the best cycling stability, with a specific capacity of 443mAhg−1 and coulombic efficiency of 99.1% after 50cycles at 0.1C, much higher than those of the pristine SnO2 hollow spheres and the other Al-doped samples. The improved electrochemical performances of Al-doped SnO2 hollow spheres are attributed to the increase of electronic conductivity and lithium ion diffusion coefficient, and therefore, enhance the reversible capacity and cycling properties.
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