Electrochemical Impedance Spectroscopy in Solid State Ionics: Recent Advances

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Electrochemical Impedance Spectroscopy (EIS) has become an important research tool in Solid State Ionics. Some new developments are highlighted: new methods of automatic parameter extraction from impedance measurements are briefly discussed. The Kramers–Kronig data validation test presents another powerful tool in the impedance data analysis. The partial-fit and subsequent subtraction procedure, in combination with the K–K test, can lead to a more appropriate equivalent circuit model for the Complex Nonlinear Least Squares (CNLS)-fit routine. Very low frequency measurements (<1 mHz) are of significant interest for characterization of intercalation electrodes (anodes and cathodes) for novel high energy density batteries. The low frequency impedances can be obtained by simple means through a carefully conducted Fourier transform of the time domain relaxation data. Impedance analysis of thin film LixCoO2 cathodes shows that combination of a Finite Length Warburg (FLW) with a Finite Space Warburg (FSW) is viable model for the Li+ diffusion process.
Original languageUndefined
Pages (from-to)65-73
Number of pages9
JournalSolid state ionics
Issue number1-4
Publication statusPublished - 2004


  • Data Analysis
  • Mixed conductivity
  • Impedance spectroscopy
  • IR-75734
  • Kramers–Kronig Test
  • METIS-218575
  • Fourier transform

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