The mechanism of lithium intercalation in graphite film electrodes in aprotic media. Part 2. Potentiostatic intermittent titration and in situ XRD studies of the solid-state ionic diffusion

M. D. Levi, E. A. Levi, D. Aurbach

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Abstract

The potentiostatic intermittent titration technique (PITT) and in situ XRD have been used to measure the dependence of the diffusion coefficient Do of lithium ions in graphite on the intercalation level X. Thin graphite electrodes provide an excellent opportunity to obtain highly-resolved data (with respect to X). A non-monotonic peak-shape dependence of log Do vs. X has been observed, which correlates well with the corresponding dependence of the XRD peak intensity and the cyclic voltammetric peaks. The results thus obtained have been explained tentatively within a framework similar to the Daumas and Herold cluster model for the staged phase transition. Problems connected with the determination of the true values of Do for porous electrodes are also discussed.

Original languageEnglish
Pages (from-to)89-97
Number of pages9
JournalJournal of Electroanalytical Chemistry
Volume421
Issue number1-2
DOIs
StatePublished - 30 Jan 1997

Keywords

  • Characteristic diffusion length
  • Chemical diffusion coefficient
  • Graphite
  • Lithium intercalation
  • PITT
  • Staged phases

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