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Charge Transfer Parameters of Ni x Mn y Co 1− x − y Cathodes Evaluated by a Transmission Line Modeling Approach
Author(s) -
Costard Janina,
Joos Jochen,
Schmidt Adrian,
Ivers-Tiffée Ellen
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000866
Subject(s) - lithium (medication) , electrolyte , cathode , electrochemistry , dielectric spectroscopy , transfer (computing) , charge (physics) , materials science , electrode , analytical chemistry (journal) , ion , line (geometry) , chemistry , physics , computer science , medicine , organic chemistry , quantum mechanics , chromatography , parallel computing , endocrinology , geometry , mathematics
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.