INIDS4-1647
Pore-network homogeneity for mechanically reliable solid-electrolyte separators in all-solid-state batteries
Topic
IDS4. Advanced Battery Materials and Interface Engineering for Next-Generation Batteries (Sponsored by EcoPro BM)
When and Where
Sep 29, 2026
11:40 - 12:05
Room 202
Session Chairs
Hongkyung LEE
Presenter(s)
Sung Kyun Jung (Seoul National University)
Co-Author(s)
Abstract
All-solid-state batteries with alloy anodes require solid-electrolyte separators that act not only as ion-conducting layers but also as stress-mediating media during repeated electrode volume changes. Yet the mechanics of powder-compacted sulfide separators are often inferred from bulk porosity or averaged modulus values, overlooking spatially heterogeneous pore networks and local weak mechanical domains. Here, we establish particle-size-distribution (PSD)-associated pore-network homogeneity as a design principle for mechanically reliable sulfide separators in alloy-anode all-solid-state batteries. By combining FIB-SEM pore mapping with spatially resolved nanoindentation, we show that separator mechanics should be evaluated as spatially distributed effective responses rather than averaged material properties alone. A broad-PSD separator lowers bulk porosity but retains pore-rich clusters and scattered local mechanical responses, whereas a narrower-PSD separator forms a more uniform pore network and mechanical landscape. Controlled full-cell tests show that pore-network homogeneity is associated with more stable cycling under matched anolyte conditions. Post-cycling morphology and microstructure-resolved digital-twin stress analysis further reveal that homogeneous pore networks mitigate local stress concentration, thereby suppressing separator cracking and interfacial delamination during alloy-anode cycling. These findings shift sulfide separator design beyond bulk densification and averaged mechanical properties toward spatially resolved pore-network homogeneity for mechanically durable alloy-anode all-solid-state batteries.
