Structural and electrochemical study of the reaction of lithium with silicon nanowires

Candace Chan, Riccardo Ruffo, Seung Sae Hong, Robert A. Huggins, Yi Cui

Research output: Contribution to journalArticle

233 Citations (Scopus)

Abstract

The structural transformations of silicon nanowires when cycled against lithium were evaluated using electrochemical potential spectroscopy and galvanostatic cycling. During the charge, the nanowires alloy with lithium to form an amorphous LixSi compound. At potentials 15Si4 phase. X-ray diffraction measurements on the Si nanowires, however, show that they are amorphous, suggesting that a different amorphous phase (LiySi) is formed. Lithium is removed from this phase in the discharge to form amorphous silicon. We have found that limiting the voltage in the charge to 70 mV results in improved efficiency and cyclability compared to charging to 10 mV. This improvement is due to the suppression of the transformation at low potentials, which alloys for reversible cycling of amorphous silicon nanowires.

Original languageEnglish
Pages (from-to)34-39
Number of pages6
JournalJournal of Power Sources
Volume189
Issue number1
DOIs
Publication statusPublished - Apr 1 2009

Fingerprint

Silicon
Lithium
Nanowires
nanowires
lithium
silicon
Amorphous silicon
amorphous silicon
cycles
charging
retarding
Spectroscopy
X ray diffraction
Electric potential
electric potential
diffraction
spectroscopy
x rays

Keywords

  • Anode
  • Lithium-ion battery
  • Phase transformation
  • Silicon nanowire

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Structural and electrochemical study of the reaction of lithium with silicon nanowires. / Chan, Candace; Ruffo, Riccardo; Hong, Seung Sae; Huggins, Robert A.; Cui, Yi.

In: Journal of Power Sources, Vol. 189, No. 1, 01.04.2009, p. 34-39.

Research output: Contribution to journalArticle

Chan, Candace ; Ruffo, Riccardo ; Hong, Seung Sae ; Huggins, Robert A. ; Cui, Yi. / Structural and electrochemical study of the reaction of lithium with silicon nanowires. In: Journal of Power Sources. 2009 ; Vol. 189, No. 1. pp. 34-39.
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