Atomic-scale mechanisms of sliding along an interdiffused Li-Si-Cu interface

Haoran Wang, Binyue Hou, Xueju Wang, Shuman Xia, Huck Beng Chew

Research output: Contribution to journalArticle

Abstract

We perform ab initio calculations on the shear deformation response of the interdiffused Li-Si-Cu phase structure existing between a lithiated Si electrode and a Cu current collector. We show that the formation of well-delineated and weakly bonded Si-Cu and Li-Cu crystalline atomic layers within this phase structure facilitates interface sliding. However, sliding can be terminated by the formation of LiSi3 compounds across these atomic layers, which causes the abrupt capacity fade of the electrode after repeated cycling.

Original languageEnglish (US)
Pages (from-to)1716-1721
Number of pages6
JournalNano letters
Volume15
Issue number3
DOIs
StatePublished - Mar 11 2015

Keywords

  • copper current collector
  • delamination
  • density functional theory
  • interface sliding
  • silicon electrode

ASJC Scopus subject areas

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

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