Noteworthy electroanalytical features of the stage 4 to stage 3 phase transition in lithiated graphite

M. D. Levi, C. Wang, E. Markevich, D. Aurbach, Z. Chvoj

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18 Scopus citations

Abstract

A careful study of electrochemical lithiation of a composite graphite electrode at elevated temperatures was performed using a potentiostatic intermittent titration technique. Special emphasis was placed on the stage 4 to stage 3 phase transition, occurring in the range of x (in LixC 6) between 0.12 and 0.22 (this corresponds to the partial dimensionless intercalation level θ ranging from 0 to 1). An abrupt increase in the Li chemical diffusion coefficient, Dchem, when approaching the relative coverage level θ = 1/3, and a specific non-Arrhenius shape of the plot of Dchem vs. the inverse of the absolute temperature were observed. These two features of the phase transition seem to be in agreement with a recent thermodynamic model for adatoms diffusing on a surface with two considerably different barrier energy sites.

Original languageEnglish
Pages (from-to)40-43
Number of pages4
JournalJournal of Solid State Electrochemistry
Volume8
Issue number1
DOIs
StatePublished - Dec 2003

Keywords

  • Electrochemical lithiation
  • Graphite electrode
  • Potentiostatic intermittent titration

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