Finite element modelling of ion transport in the electrolyte of a 3D-microbattery |
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Authors: | Vahur ZadinDaniel Brandell Heiki KasemägiAlvo Aabloo John O Thomas |
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Institution: | a Institute of Technology, Tartu University, Nooruse 1, 50411 Tartu, Estoniab Department of Materials Chemistry, Uppsala University, Box 538, SE-751 21 Uppsala, Sweden |
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Abstract: | A mathematical model describing ionic transport in a 3D-microbattery (3D-MB) electrolyte is developed here using finite element methodology. The model is then exploited to study a 3D-MB based on an interdigitated plate (“trench”) architecture for a 10 μm-thick electrolyte layer separating 10 μm-thick graphite anode and LiCoO2 cathode plates. The effect of varying plate length, end-shape and electronic conductivity is also modelled. It is shown that the 3D-MB architecture gives rise to qualitatively non-uniform current densities, leading to sub-optimal surface utilization. This can, in turn, be optimized by varying electrode geometries and/or material properties. |
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Keywords: | Three-dimensional microbattery Electrolyte modelling Finite element analysis |
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