A simple model for interpreting the reaction-diffusion characteristics of Li-Air batteries

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Abstract

With the goal of creating a model of a Li-Air battery that is consistent with voltammetry data, we develop a full battery model capable of giving insight into details of cell operation otherwise inaccessible to common experimental techniques. With this model, we investigate the dependence of the current on: The diffusion characteristics of the electrolyte, the solubility of the ambient oxygen, the structure of the cathode, and aspects of the primary surface reaction.We explore modifications to a basic reaction-diffusion model of a full cell that bring better agreement with experimental data, including gas-electrolyte surface limited diffusion and a partially active cathode. We discuss how the basic form of the model and the simulated reaction and concentration profiles affect cell dynamics.

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Jones, R. E., Gittleson, F. S., Templeton, J. A., & Ward, D. K. (2017). A simple model for interpreting the reaction-diffusion characteristics of Li-Air batteries. In Journal of the Electrochemical Society (Vol. 164, pp. A6422–A6430). Electrochemical Society Inc. https://doi.org/10.1149/2.0641701jes

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