Composite or hybrid organic-inorganic electrolytes have gained significant attention as potential solutions for next-generation solid-state batteries. These electrolytes combine the advantages of polymers and ceramic ionic conductors, offering improved mechanical properties and resolving contact issues typically found in full ceramic solid-state batteries.
In hybrid electrolytes, the lithium-ion conductivities of the individual ceramic and polymer components represent just one facet affecting the overall conductivity. A significant influence stems from the modification of the polymer material in the vicinity of the ceramic particles and the resistance of the interface between polymer and ceramic. The presence of ceramic particles disrupts the local poly (ethylene oxide) (PEO) chain organization, change the degree of ordering  in the polymer adjacent to ceramic particles.
We undertake a methodical investigation of ceramic-based polymer composite electrolytes taking into account the interface layer's properties, particularly  its thickness associated ionic conductivity. This comprehensive analysis will involve the examination of diverse particle distributions sourced from experimentally prepared samples, enabling us to draw comparisons between the resulting data and our simulation results.

Our investigation has revealed a congruence between the ionic conductivity values obtained from our model and those derived from experimental results, particularly specific conductivities and thickness of the LLZO/PEO interface or the boundary layer, namely 1.8 × 10^-2 S/m (around 10 times of the bulk polymer conductivity), and 450 nm (around half of the magnitude of the mean of the filler diameter size), respectively. In this case, a maximum conductivity is observed in line with the solid volume percentage ceramic material.