TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Grübl, Daniel
A1  - Bergner, Benjamin
A1  - Janek, Jürgen
A1  - Bessler, Wolfgang G.
T1  - Dynamic Modeling of the reaction mechanism ion a Li/O2 Cell :Influence of Redox Madiator
JF  - ECS Transactions
N2  - 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 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.
KW  - Batterie
KW  - Elektrochemie
Y1  - 2015
SN  - 1938-5862
SS  - 1938-5862
U6  - https://doi.org/10.1149/06919.0011ecst
DO  - https://doi.org/10.1149/06919.0011ecst
VL  - 15
SP  - 11
EP  - 21
ER  -