  All-solid-state batteries are seen as promising candidates to replace
conventional batteries with liquid electrolytes in many applications. However,
they are not yet feasible for many relevant applications. One particular
question of interest is the identification of physical effects inside
all-solid-state batteries and their quantitative influence on the performance
of the entire battery cell. Simulation models can contribute to answering the
aforementioned question by systematical studies, e.g. enabling or disabling
certain physical effects. Especially the influence of space-charge layers
(SCLs) is heavily discussed in the scientific community. So far, the different
length scales of SCLs and the microstructure of a battery cell made a spatial
discretization of realistic microstructures with resolved SCLs infeasible.
However, thermodynamically consistent continuum models which are applied to
simplified geometries are already established in the literature. In this work,
we propose a model that enables the prediction of the spatial development of
SCLs within geometrically resolved microstructures by exploiting that effects
in SCLs are predominantly one-dimensional. With the proposed approach it is
possible to quantify the geometric influence of realistic microstructures on
the formation process of SCLs. SCLs in realistic microstructures remarkably
differ from SCLs computed with simplified one-dimensional models which are
already established in the literature.
