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Diffusion Coefficients of Lithium Ions during Intercalation into Graphite Derived from the Simultaneous Measurements and Modeling of Electrochemical Impedance and Potentiostatic Intermittent Titration Characteristics of Thin Graphite Electrodes

Levi, M. D., Aurbach, D.·1997·The Journal of Physical Chemistry B

Abstract

The solid state diffusion of lithium into graphite during electrochemical intercalation processes was investigated using potentiostatic intermittent titration (PITT) and impedance spectroscopy (EIS). The diffusion coefficient ( D ) as a function of the intercalation level ( X ) and the electrode potential ( E ) was calculated on the basis of both methods and gave similar results. The D vs X or E plots were found to be nonmonotonous, with three pronounced minima at the same potentials in which the cyclic voltammetry of these systems shows the peaks related to the phase transition between the lithium−graphite intercalation stages. It was found that the critical diffusion length for these electrodes relates to the graphite particles' dimensions along their basal planes and not to the electrode thickness. The reason for the peaklike dependence of the D on X and E is discussed in light of the nature of the intercalation processes.

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Authors
Levi, M. D., & Aurbach, D.
Venue
The Journal of Physical Chemistry B
Published
1997-06-01
Volume
101
Issue
23
Pages
4641-4647
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W2064547799
Cited by
478
References
0
FWCI
11.56
Type
journal article
Language
en
Open access
closed

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