Simulated Impedance of Diffusion in Porous Media

Donal Finegan, Samuel Cooper, Antonio Bertei, Nigel Brandon

Research output: Contribution to journalArticlepeer-review

128 Scopus Citations

Abstract

This paper describes the use of a frequency domain, finite-difference scheme to simulate the impedance spectra of diffusion in porous microstructures. Both open and closed systems are investigated for a range of ideal geometries, as well as some randomly generated synthetic volumes and tomographically derived microstructural data. In many cases, the spectra deviate significantly from the conventional Warburg-type elements typically used to represent diffusion in equivalent circuit analysis. A key finding is that certain microstructures show multiple peaks in the complex plane, which may be misinterpreted as separate electrochemical processes in real impedance data. This is relevant to battery electrode design as the techniques for nano-scale fabrication become more widespread. This simulation tool is provided as an open-source MatLab application and is freely available online as part of the TauFactor platform.

Original languageAmerican English
Pages (from-to)681-689
Number of pages9
JournalElectrochimica Acta
Volume251
DOIs
StatePublished - 10 Oct 2017

Bibliographical note

Publisher Copyright:
© 2017 The Authors

NREL Publication Number

  • NREL/JA-5400-70341

Keywords

  • Diffusion
  • EIS
  • Impedance
  • Microstructure
  • TauFactor
  • Tomography
  • Warburg

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