FEM modelling of a coaxial three-electrode test cell for electrochemical impedance spectroscopy in lithium ion batteries

JOURNAL OF POWER SOURCES

卷:240

Article

Klink, Stefan¹  Hoeche, Daniel²  La Mantia, Fabio³  Schuhmann, Wolfgang^1,3 

[1] Ruhr Univ Bochum, D-44780 Bochum, Germany

[2] Zentrum Mat & Kustenforsch GmbH, Helmholtz Zentrum Geesthacht, Inst Mat Res, Dept Corros & Magnesium Surface Technol, D-21502 Geesthacht, Germany

[3] Ruhr Univ Bochum, CES, D-44780 Bochum, Germany

关键词: Electrochemical impedance spectroscopy;    Finite element method;    Reference electrode;    Lithium ion battery;    Geometry;    Distortions;   

DOI  :  10.1016/j.jpowsour.2013.03.186

来源: Elsevier

【 摘 要 】

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. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

Free