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- W2952564982 abstract "Zinc-air batteries offer large specific energy densities, while relying on abundant and non-toxic materials. In this paper, we present the first multi-dimensional simulations of zinc-air batteries. We refine our existing theory-based model of secondary zinc-air systems. The model comprises thermodynamically consistent multi-species transport in alkaline electrolytes, formation and dissolution of metallic zinc and passivating zinc oxide, as well as multi-phase coexistence in gas diffusion electrodes. For the first time, we simulate zinc shape-change during battery cycling by modeling convection of zinc solids. We validate our model with in-situ tomography of commercial button cells. Two-dimensional volume-averaged simulations of cell voltage and zinc electrode morphology during discharge agree with these measurements. Thus, we can study how electrolyte carbonation limits shelf-life and how zinc shape-change limits cycle-life. The charging current is found to be the major contributor to cycle-life limitations. Finally, we optimize initial anode structure and charge-discharge protocols for improved performance and cycle-ability. Furthermore, we extend our model to a flexible thin-film battery as example of alternative cell design." @default.
- W2952564982 created "2019-06-27" @default.
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- W2952564982 date "2019-08-01" @default.
- W2952564982 modified "2023-10-15" @default.
- W2952564982 title "Zinc electrode shape-change in secondary air batteries: A 2D modeling approach" @default.
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- W2952564982 doi "https://doi.org/10.1016/j.jpowsour.2019.126649" @default.
- W2952564982 hasPublicationYear "2019" @default.
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