Electrochemical impedance spectroscopy in solid state ionics: recent advances

Boukamp, Bernard A. (2004) Electrochemical impedance spectroscopy in solid state ionics: recent advances. Solid State Ionics, 169 (1-4). pp. 65-73. ISSN 0167-2738

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Abstract:	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.
Item Type:	Article
Copyright:	© 2004 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/75734
Official URL:	http://dx.doi.org/10.1016/j.ssi.2003.07.002
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