Effect of Conductive Additive Morphology on Pore Evolution and AM-SE Interfacial Contact in Sulfide-Based ASSB Cathodes

Abstract

All-solid-state batteries (ASSBs) offer high energy density and improved safety by utilizing lithium metal anodes and non-flammable solid electrolytes. In ASSBs, ion transport occurs through solid–solid interfaces. Thus, the electrode microstructure, governed by the properties of its components, is critical to electrochemical performance. In this study, ASSB cathodes incorporating onedimensional (1D) conductive additives (CAs) were fabricated and analyzed. The additives were categorized by their length and compaction characteristics into low aspect ratio (L-AR) and high aspect ratio (H-AR). Their effects on cathode densification, active material (AM)– solid electrolyte (SE) interfacial contact, and ionic– electronic transport were systematically investigated. Based on these results, morphology-driven design strategies for improving the cycling stability of ASSB cathodes are proposed.