Abstract
Nanocrystalline Si-embedded SiOx-Al2O3 composite materials were synthesized by a high-energy mechanical milling method, and their potential as an anode material for Li-ion batteries was examined. The starting materials were amorphous SiO2 and Al metal powders. To increase the initial coulombic efficiency of the SiO2-based electrode materials, the amorphous SiO2 was reduced by Al. The reducing medium was decided by calculating the thermodynamic formation energy. During the highenergy milling process, SiO2 was partially reduced and Al was simultaneously oxidized to aluminum oxide, yielding nano Si-embedded composite. The composite was characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and high-resolution transmission microscopy. In electrochemical tests, the reversible capacity of the composite electrode was approximately 850 mAh g-1 with enhanced initial coulombic efficiency of 66%. This performance of the composite electrode was achieved not through carbon incorporation, but through the formation of Si-embedded nanocomposites.
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Kim, K., Kim, MS., Choi, H. et al. Si-SiOx-Al2O3 nanocomposites as high-capacity anode materials for Li-ion batteries. Electron. Mater. Lett. 13, 152–159 (2017). https://doi.org/10.1007/s13391-017-6406-0
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DOI: https://doi.org/10.1007/s13391-017-6406-0