# Charge Transfer Parameters of Ni$_{x}$Mn$_{y}$Co$_{1-x-y}$ Cathodes Evaluated by a Transmission Line Modeling Approach

Costard, Janina; Joos, Jochen; Schmidt, Adrian; Ivers-Tiffée, Ellen

##### Abstract:
The performance of lithium‐ion batteries can be analyzed and improved by appropriate electrochemical models. A challenging yet crucial part is the parameterization of these models. Until now, the literature has incompletely investigated and cited the charge transfer process parameters describing the lithium transfer between the active material particles in the electrode and the liquid electrolyte. Herein, a novel approach is presented for obtaining these charge transfer parameters. The well‐established experimental methods of electrochemical impedance spectroscopy and focused ion beam tomography are applied. By introducing both experimental results into a transmission line model, a reliable determination of the charge transfer parameters j$_{0}$, k, and r$_{CT}$ can be achieved. The new approach is validated by comparing the results of four cathodes, all containing the state‐of‐the‐art active material Ni$_{x}$Mn$_{y}$Co$_{1-x-y}$ (NMC), but with different microstructures and/or stoichiometries.

 Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffe der Elektrotechnik (IAM-WET) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2021 Sprache Englisch Identifikator ISSN: 2194-4288, 2194-4296 KITopen-ID: 1000129553 Erschienen in Energy technology Verlag Wiley-VCH Verlag Seiten Art.-Nr.: 2000866 Vorab online veröffentlicht am 19.12.2020 Nachgewiesen in DimensionsWeb of ScienceScopus
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