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Issue 23, 2010
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Characterizations and electrochemical behaviors of disproportionated SiO and its composite for rechargeable Li-ion batteries

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Abstract

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 °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.

Graphical abstract: Characterizations and electrochemical behaviors of disproportionated SiO and its composite for rechargeable Li-ion batteries

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Publication details

The article was received on 13 Nov 2009, accepted on 25 Mar 2010 and first published on 10 May 2010


Article type: Paper
DOI: 10.1039/B923926J
Citation: J. Mater. Chem., 2010,20, 4854-4860
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    Characterizations and electrochemical behaviors of disproportionated SiO and its composite for rechargeable Li-ion batteries

    C. Park, W. Choi, Y. Hwa, J. Kim, G. Jeong and H. Sohn, J. Mater. Chem., 2010, 20, 4854
    DOI: 10.1039/B923926J

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