Nanosize Si anode embedded in super-elastic nitinol (Ni-Ti) shape memory alloy matrix for Li rechargeable batteries

Heechul Jung, Young Ugk Kim, Min Seok Sung, Yoon Hwa, Goojin Jeong, Geun Bae Kim, Hun Joon Sohn

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

A nanosize Si embedded in super-elastic Nitinol alloy matrix composite was synthesized in large-scale using arc melting followed by a rapid quenching method. Both X-ray diffraction and high resolution transmission electron microscope with energy dispersive spectroscopy analyses confirmed that approximately 50 nm Si crystallites were surrounded by the Ni-Ti matrix. Ex situ synchrotron XRD was performed to elucidate the phase transition of active materials during lithiation and delithiation. The local structural changes of the Ni-Ti inactive matrix during cycling were investigated by ex situ X-ray absorption spectroscopy analyses. This anode material showed an excellent electrochemical stability since the elastic behavior of the inactive Nitinol matrix absorbed the stress generated due to the volume expansion during lithiation of the nanosized Si embedded.

Original languageEnglish (US)
Pages (from-to)11213-11216
Number of pages4
JournalJournal of Materials Chemistry
Volume21
Issue number30
DOIs
StatePublished - Aug 14 2011
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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