Electrochemical impedance spectroscopy of electrochemically self-assembled lithium-iodine batteries

L. Weinstein, William Michael Yourey, J. Gural, G. G. Amatucci

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Electrochemical impedance spectroscopy (EIS) of self-assembled lithium-iodine batteries was performed in both two and three-electrode configurations. The in situ EIS spectrum of the cell transitioned from that associated with an initial ideal ionic conductor for the LiI-based composite in the unformed state to that of three depressed semicircles as the cell formed. The assignments of these spectral features were made empirically using various techniques. Three-electrode measurements using a Ag|AgI reference electrode and dynamic impedance measurements were used to confirm these assignments. The charge-transfer process at the positive electrode is the main kinetically limiting factor, especially toward the end of the lithiation cycle. In situ Raman spectroscopy confirmed the formation of the polyiodide anions I3- and I5- in the positive electrode region during cell formation.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume155
Issue number8
DOIs
StatePublished - Jul 11 2008

Fingerprint

Iodine
Electrochemical impedance spectroscopy
Lithium
iodine
electric batteries
lithium
impedance
Electrodes
electrodes
spectroscopy
cells
impedance measurement
Anions
Raman spectroscopy
Charge transfer
Negative ions
conductors
charge transfer
Cells
anions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrochemistry

Cite this

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Electrochemical impedance spectroscopy of electrochemically self-assembled lithium-iodine batteries. / Weinstein, L.; Yourey, William Michael; Gural, J.; Amatucci, G. G.

In: Journal of the Electrochemical Society, Vol. 155, No. 8, 11.07.2008.

Research output: Contribution to journalArticle

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