Arrays of sealed silicon nanotubes as anodes for lithium ion batteries

Taeseup Song, Jianliang Xia, Jin Hyon Lee, Dong Hyun Lee, Moon Seok Kwon, Jae Man Choi, Jian Wu, Seok Kwang Doo, Hyuk Chang, Won Il Park, Dong Sik Zang, Hansu Kim*, Yonggang Huang, Keh Chih Hwang, John A. Rogers, Ungyu Paik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

713 Scopus citations

Abstract

Silicon is a promising candidate for electrodes in lithium ion batteries due to its large theoretical energy density. Poor capacity retention, caused by pulverization of Si during cycling, frustrates its practical application. We have developed a nanostructured form of silicon, consisting of arrays of sealed, tubular geometries that is capable of accommodating large volume changes associated with lithiation in battery applications. Such electrodes exhibit high initial Coulombic efficiencies (i.e., >85%) and stable capacity-retention (>80% after 50 cycles), due to an unusual, underlying mechanics that is dominated by free surfaces. This physics is manifested by a strongly anisotropic expansion in which 400% volumetric increases are accomplished with only relatively small (<35%) changes in the axial dimension. These experimental results and associated theoretical mechanics models demonstrate the extent to which nanoscale engineering of electrode geometry can be used to advantage in the design of rechargeable batteries with highly reversible capacity and long-term cycle stability.

Original languageEnglish (US)
Pages (from-to)1710-1716
Number of pages7
JournalNano Letters
Volume10
Issue number5
DOIs
StatePublished - May 12 2010

Keywords

  • Anisotropic expansion
  • Lithium ion battery
  • Nanotubes
  • Silicon

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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