All-solid-state batteries (ASSBs) are considered one of the most promising next-generation batteries due to their outstanding safety and superior energy density. For the commercial success of ASSBs, developing a scalable wet-slurry-based electrode manufacturing process is essential. In this regard, non-polar solvents have been generally used in the wet-slurry process with sulfide-based solid electrolytes (SEs) to avoid their chemical crosstalk. Although many studies on the chemical compatibility between sulfide-based SEs and non-polar solvents have been conducted, to the best of the knowledge, an in-depth understanding of the interfacial chemistry between those solvents and active materials is not fully elucidated. In this study, the chemical incompatibility of LiNi