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arXiv · 2201.09661

Cell voltage model for Li-Bi liquid metal batteries

Norbert Weber·Carolina Duczek·Gerrit M. Horstmann·Steffen Landgraf·Michael Nimtz·Paolo Personnettaz·Tom Weier·Donald R. Sadoway
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Abstract

Lithium-bismuth bimetallic cells are amongst the best explored liquid metal batteries. A simple and fast quasi-one-dimensional cell voltage model for such devices is presented. The equilibrium cell potential is obtained from a complex two-dimensional fit of data drawn from multiple studies of equilibrium cell potential and rendered congruent with the phase diagram. Likewise, several analytical and fit functions for the ohmic potential drop across the electrolyte are provided for different battery geometries. Mass transport overpotentials originating from the alloying of Li into Bi are modelled by solving a diffusion equation, either analytically or numerically, and accounting for the volume change of the positive electrode. The applicability and limitations of the model are finally illustrated in three distinct experimental settings.

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Norbert Weber, Carolina Duczek, Gerrit M. Horstmann, Steffen Landgraf, Michael Nimtz, Paolo Personnettaz, Tom Weier, Donald R. Sadoway. 2022-01-14. Cell voltage model for Li-Bi liquid metal batteries. https://doi.org/10.1016/j.apenergy.2021.118331

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