Journal Article

FZJ-2016-03425

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quantitative Analysis of Time-Domain Supported Electrochemical Impedance Spectroscopy Data of Li-Ion Batteries: Reliable Activation Energy Determination at Low Frequencies

Mertens, A. (Corresponding author)FZJ* ; Vinke, I. C.FZJ* ; Tempel, H.FZJ* ; Kungl, H.FZJ* ; de Haart, L. G. J. ; Eichel, R.-A.FZJ* ; Granwehr, J.FZJ*

2016
Electrochemical Soc. Pennington, NJ

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Please use a persistent id in citations: doi:10.1149/2.0511607jes

Abstract: For an accurate characterization of transport and mobility processes in batteries using electrochemical impedance spectroscopy (EIS), a large frequency range of up to ten decades must be covered. It is experimentally demonstrated, for the first time, that the phase of the impedance measurements converges in the sub-millihertz range, which permits a reliable quantification of diffusion kinetics. To avoid a considerable change of the state of charge (SOC) of the battery and to mitigate the very long measurement times caused by standard EIS, a combination of EIS and time domain measurements, the time-domain supported electrochemical impedance spectroscopy (TD-EIS), is employed. To ensure an utmost comparability and reproducibility of the results with minimum influence of the cell fabrication, the method is demonstrated using three equivalent, industrially manufactured lithium-ion pouch cells at varying temperatures. The obtained impedance data were fitted by an electrical equivalent circuit battery model for an accurate estimate of charge transfer resistance and, in particular, also solid-state diffusion rate. Both processes follow an Arrhenius law, allowing the determination of activation energies with small variance. The obtained results are within the range of literature values measured for similar systems. The relevance of very low frequency impedance data for accurate fitting of mobility parameters in batteries is discussed.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)
2. JARA-ENERGY (JARA-ENERGY)
3. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)
2. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2016

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; No Authors Fulltext ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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