Tough germanium nanoparticles under electrochemical cycling

Wentao Liang, Hui Yang, Feifei Fan, Yang Liu, Xiao Hua Liu, Jian Yu Huang, Ting Zhu, Sulin Zhang

Research output: Contribution to journalArticle

141 Scopus citations

Abstract

Mechanical degradation of the electrode materials during electrochemical cycling remains a serious issue that critically limits the capacity retention and cyclability of rechargeable lithium-ion batteries. Here we report the highly reversible expansion and contraction of germanium nanoparticles under lithiation-delithiation cycling with in situ transmission electron microscopy (TEM). During multiple cycles to the full capacity, the germanium nanoparticles remained robust without any visible cracking despite ∼260% volume changes, in contrast to the size-dependent fracture of silicon nanoparticles upon the first lithiation. The comparative in situ TEM study of fragile silicon nanoparticles suggests that the tough behavior of germanium nanoparticles can be attributed to the weak anisotropy of the lithiation strain at the reaction front. The tough germanium nanoparticles offer substantial potential for the development of durable, high-capacity, and high-rate anodes for advanced lithium-ion batteries.

Original languageEnglish (US)
Pages (from-to)3427-3433
Number of pages7
JournalACS nano
Volume7
Issue number4
DOIs
StatePublished - Apr 23 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Liang, W., Yang, H., Fan, F., Liu, Y., Liu, X. H., Huang, J. Y., Zhu, T., & Zhang, S. (2013). Tough germanium nanoparticles under electrochemical cycling. ACS nano, 7(4), 3427-3433. https://doi.org/10.1021/nn400330h