  All-solid-state batteries (ASSBs) offer a promising route to safer batteries
with superior energy density compared to conventional Li-ion batteries (LIBs).
However, the design of the composite cathode and optimization of the underlying
microstructure is one of the aspects requiring intensive research. Achieving
both high energy and power density remains challenging due to limitations in
ionic conductivity and active material loading. Using structure-resolved
simulations, we investigate the potential of perforated and layered electrode
designs to enhance ASSB performance. Design strategies showing significant
performance increase in LIBs are evaluated regarding their application to
ASSBs. Composite cathodes with solid electrolyte channels in the structure do
not significantly increase cell performance compared to unstructured
electrodes. However, the design with a two-layer cathode proves promising. The
layered structure effectively balances improved ionic transport due to
increased solid electrolyte fraction at the separator side and substantial
active material loading through increased active material fraction at the
current collector side of the cathode. Our research highlights key challenges
in ASSB development and provides a clear direction for future studies in the
field.
