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Physico‐Chemical Modeling of a Lithium‐Ion Battery : An Ageing Study with Electrochemical Impedance Spectroscopy

Title data

Heinrich, Marco ; Wolff, Nicolas ; Harting, Nina ; Laue, Vincent ; Röder, Fridolin ; Seitz, Steffen ; Krewer, Ulrike:
Physico‐Chemical Modeling of a Lithium‐Ion Battery : An Ageing Study with Electrochemical Impedance Spectroscopy.
In: Batteries & Supercaps. Vol. 2 (6 March 2019) Issue 6 . - pp. 530-540.
ISSN 2566-6223
DOI: https://doi.org/10.1002/batt.201900011

Abstract in another language

Electrochemical Impedance Spectroscopy measurements and simulations are performed on a nickel manganese cobalt oxide (NMC)/graphite pouch cell. A physico‐chemical continuum battery model is extended by a physical ageing model including a Solid Electrolyte Interphase. The model assumes a loss of electrochemically active surface area at anode and cathode as well as a growth of solid electrolyte interphase (SEI) layer thickness. These ageing parameters have been adjusted with an algorithm to achieve agreement between simulated and measured spectra. The results for a 28 mAh pouch cell show that the ageing model is suitable to correlate the change of the impedance spectrum with the degree of degradation of the cell. In detail, SEI thickness is shown to increase by 45 nm, while the anode and cathode loose 20 % and 57 % of their electrochemically active surface area, respectively. In addition, deviating measurement conditions and the end of life of the cell can be indicated by the parameter identification algorithm. Furthermore, it is demonstrated, that the change of the high and low frequency semicircles can be assigned to the anode SEI and cathode respectively.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties
Faculties > Faculty of Engineering Science > Junior Professor Methods of Monitoring and Managing Batteries > Junior Professor Methods of Monitoring and Managing Batteries - Juniorprof. Dr.-Ing. Fridolin Röder
Faculties > Faculty of Engineering Science > Junior Professor Methods of Monitoring and Managing Batteries
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 20 Nov 2020 07:27
Last Modified: 27 Nov 2020 07:34
URI: https://eref.uni-bayreuth.de/id/eprint/59648