Current density distribution in cylindrical Li-Ion cells during impedance measurements

Osswald, P. J. and Erhard, S. V. and Noel, A. and Kiel, P. and Kindermann, F. M. and Hoster, Harry Ernst and Jossen, Andreas (2016) Current density distribution in cylindrical Li-Ion cells during impedance measurements. Journal of Power Sources, 314. pp. 93-101. ISSN 0378-7753

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Abstract

In this work, modified commercial cylindrical lithium-ion cells with multiple separate current tabs are used to analyze the influence of tab pattern, frequency and temperature on electrochemical impedance spectroscopy. In a first step, the effect of different current tab arrangements on the impedance spectra is analyzed and possible electrochemical causes are discussed. In a second step, one terminal is used to apply a sinusoidal current while the other terminals are used to monitor the local potential distribution at different positions along the electrodes of the cell. It is observed that the characteristic decay of the voltage amplitude along the electrode changes non-linearly with frequency, where high-frequent currents experience a stronger attenuation along the current collector than low-frequent currents. In further experiments, the decay characteristic is controlled by the cell temperature, driven by the increasing resistance of the current collector and the enhanced kinetic and transport properties of the active material and electrolyte. Measurements indicate that the ac current distribution depends strongly on the frequency and the temperature. In this context, the challenges for electrochemical impedance spectroscopy as cell diagnostic technique for commercial cells are discussed.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Power Sources
Additional Information:
This is the author’s version of a work that was accepted for publication in Joural of Power Sources. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Power Sources, 314, 2016 DOI: 10.1016/j.jpowsour.2016.02.070
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2100/2105
Subjects:
ID Code:
78714
Deposited By:
Deposited On:
15 Mar 2016 09:22
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Apr 2020 03:53