Dynamic Modeling of the reaction mechanism ion a Li/O2 Cell :Influence of Redox Madiator
- Lithium-oxygen cells with organic electrolyte suffer high overpotentials during charge, indicating asymmetric charge/discharge reaction mechanisms. We present a multi-physics dynamic modeling and simulation study of the Li/O2 cell cycling behavior. We present three different multi-step mechanisms of the 2 Li + O2 ⇄ Li2O2 cell reaction, (A) a reversible 5-step mechanism, (B) a partiallyLithium-oxygen cells with organic electrolyte suffer high overpotentials during charge, indicating asymmetric charge/discharge reaction mechanisms. We present a multi-physics dynamic modeling and simulation study of the Li/O2 cell cycling behavior. We present three different multi-step mechanisms of the 2 Li + O2 ⇄ Li2O2 cell reaction, (A) a reversible 5-step mechanism, (B) a partially irreversible 6-step mechanism, and (C) a partially irreversible 8-step mechanism that includes reactions of a redox mediator. Model predictions are compared to experimental galvanostatic cycling data of Swagelok cells without and with 2,2,6,6-tetramethylpiperidinyloxyl (TEMPO) as redox mediator. All mechanisms are able to predict the discharge behavior in good agreement to the experimental results. The experimentally observed high charge overpotentials as well as their reduction by using a redox mediator can be qualitatively reproduced with the irreversible reaction mechanisms. However, the particular shape of the experimental charge curve with continuously increasing charge overpotential cannot be reproduced with the present mechanisms.…
Document Type: | Article (reviewed) |
---|---|
Zitierlink: | https://opus.hs-offenburg.de/1856 | Bibliografische Angaben |
Title (English): | Dynamic Modeling of the reaction mechanism ion a Li/O2 Cell :Influence of Redox Madiator |
Author: | Daniel Grübl, Benjamin Bergner, Jürgen Janek, Wolfgang G. BesslerStaff MemberORCiDGND |
Year of Publication: | 2015 |
Creating Corporation: | Electrochemical Society |
First Page: | 11 |
Last Page: | 21 |
Parent Title (English): | ECS Transactions |
Volume: | 15 |
ISSN: | 1938-5862 |
DOI: | https://doi.org/10.1149/06919.0011ecst |
Language: | English | Inhaltliche Informationen |
Institutes: | Forschung / INES - Institut für nachhaltige Energiesysteme |
Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019) | |
Institutes: | Bibliografie |
GND Keyword: | Batterie; Elektrochemie | Formale Angaben |
Open Access: | Closed Access |
Licence (German): | Urheberrechtlich geschützt |