Journal of Power Sources, Oct 15, 2013, Vol.240, p.273(8)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jpowsour.2013.03.186 Byline: Stefan Klink, Daniel Hoche, Fabio La Mantia, Wolfgang Schuhmann Abstract: Electrochemical impedance spectroscopy for lithium ion batteries has recently gained increasing attention due to its ability of non-invasive evaluation of important electrochemical parameters. Commonly used three-electrode test cells, however, proved unreliable due to asymmetric current line distributions, causing severe distortions of impedance spectra. Finite element method (FEM) simulations can visualize these current lines at different frequencies and simulate impedance spectra at given geometries. By applying FEM simulations to a recently developed coaxial impedance test cell, limiting conditions for reliable impedance measurements could be identified. Using a reference electrode in coaxial position yields sufficiently reliable results as long as the electrode misalignment is small compared to the electrolyte thickness and edge effects are prevented. Author Affiliation: (a) Analytische Chemie - Elektroanalytik & Sensorik, Ruhr-Universitat Bochum, Universitatstr. 150, D-44780 Bochum, Germany (b) Department of Corrosion and Magnesium Surface Technology, Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Zentrum fur Material-und Kustenforschung GmbH, Max-Planck-Stra[sz]e 1, D-21502 Geesthacht, Germany (c) Center for Electrochemical Sciences - CES, Ruhr-Universitat Bochum, Universitatstr. 150, D-44780 Bochum, Germany Article History: Received 7 February 2013; Revised 22 March 2013; Accepted 27 March 2013
Finite Element Method -- Chemical Properties ; Finite Element Method -- Models ; Batteries -- Chemical Properties ; Batteries -- Models ; Spectroscopy -- Chemical Properties ; Spectroscopy -- Models ; Corrosion (Chemistry) -- Chemical Properties ; Corrosion (Chemistry) -- Models
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