Lithium-assisted electrochemical welding in silicon nanowire battery electrodes

Khim Karki, Eric Epstein, Jeong Hyun Cho, Zheng Jia, Teng Li, S. Tom Picraux, Chunsheng Wang, John Cumings

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

From in situ transmission electron microscopy (TEM) observations, we present direct evidence of lithium-assisted welding between physically contacted silicon nanowires (SiNWs) induced by electrochemical lithiation and delithiation. This electrochemical weld between two SiNWs demonstrates facile transport of lithium ions and electrons across the interface. From our in situ observations, we estimate the shear strength of the welded region after delithiation to be approximately 200 MPa, indicating that a strong bond is formed at the junction of two SiNWs. This welding phenomenon could help address the issue of capacity fade in nanostructured silicon battery electrodes, which is typically caused by fracture and detachment of active materials from the current collector. The process could provide for more robust battery performance either through self-healing of fractured components that remain in contact or through the formation of a multiconnected network architecture.

Original languageEnglish (US)
Pages (from-to)1392-1397
Number of pages6
JournalNano letters
Volume12
Issue number3
DOIs
StatePublished - Mar 14 2012

Keywords

  • Silicon nanowires
  • in situ TEM
  • interfacial lithium diffusivity
  • lithium-ion battery
  • self-healing
  • welding

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