Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 23, Pages 4854-4860Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b923926j
Keywords
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Funding
- Korea Science and Engineering Foundation (KOSEF) through the Research Center for Energy Conversion and Storage at Seoul National University [R11-2002-102-02001-0]
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Commercially available solid SiO is composed of amorphous Si with silicon suboxides of various valence states. Solid SiO is thermodynamically unstable at all temperatures, which would disproportionate to Si and SiO2. Disproportionation of SiO at several temperatures was characterized with various analytical techniques, such as XRD, XPS, NMR and HRTEM methods, and it was found that the sample heat treated at 1000 degrees C contained well-developed Si nanocrystals uniformly dispersed within an amorphous SiOx matrix. Using this sample, a nano-Si/SiOx/graphite composite was obtained by a straightforward high-energy mechanical milling technique. The nano-Si/SiOx/graphite composite was tested as an anode material for Li secondary batteries, and showed better electrochemical behaviors than those of pure SiO.
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