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Asymmetry of Discharge/Charge Curves of Lithium-Ion Battery Intercalation Electrodes

  • Nickel cobalt aluminum oxide (NCA) based lithium-ion battery electrodes exhibit a distinct asymmetry in discharge/charge behavior towards high bulk stoichiometry (low state of charge). We show that basic electrochemical relationships, that is, the Nernst equation and the Butler-Volmer equation, are able to reproduce this behavior when a two-step reaction mechanism is assumed. The two-stepNickel cobalt aluminum oxide (NCA) based lithium-ion battery electrodes exhibit a distinct asymmetry in discharge/charge behavior towards high bulk stoichiometry (low state of charge). We show that basic electrochemical relationships, that is, the Nernst equation and the Butler-Volmer equation, are able to reproduce this behavior when a two-step reaction mechanism is assumed. The two-step mechanism consists of (1) lithium-ion adsorption from the electrolyte onto the active material particle surface under electron transfer, and (2) intercalation of surface-adsorbed lithium atoms into the bulk material. The asymmetry of experimental half-cell data of an NCA electrode cycled at 0.1 C-rate can be quantitatively reproduced with this simple model. The model parameters show two alternative solutions, predicting either a saturated (highly-covered) or a depleted surface for high bulk lithiation.show moreshow less

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Metadaten
Author:Florian Hall, Sabine Wußler, Hilmi Buqa, Wolfgang G. BesslerORCiDGND
Year of Publication:2016
Language:English
GND Keyword:Aufladung; Lithium-Ionen-Akkumulator
Parent Title (English):The Journal of Physical Chemistry C
Volume:120
Issue:41
ISSN:1932-7455 (Online)
ISSN:1932-7447 (Print)
First Page:23407
Last Page:23414
Document Type:Article (reviewed)
Institutes:Bibliografie
Release Date:2018/02/07
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1021/acs.jpcc.6b07949