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

Cheol Min Park, Woongchul Choi, Yoon Hwa, Jae Hun Kim, Goojin Jeong, Hun Joon Sohn

Research output: Contribution to journalArticlepeer-review

168 Scopus citations

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/SiO x/graphite composite was tested as an anode material for Li secondary batteries, and showed better electrochemical behaviors than those of pure SiO.

Original languageEnglish (US)
Pages (from-to)4854-4860
Number of pages7
JournalJournal of Materials Chemistry
Volume20
Issue number23
DOIs
StatePublished - 2010
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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