Designing Si Anode in Sulfide-Based All-Solid-State Batteries: Insights from Established Strategies in Lithium-Ion Batteries

Silicon (Si) has attracted significant interest as a promising anode material for all-solid-state batteries (ASSBs) due to its exceptional potential to address safety concerns and enhance energy density. However, despite the difference in configuration between sulfide-based ASSBs and lithium-ion batteries (LIBs), the degradation mechanism of Si anode in both systems exhibit similarities, primarily attributed to the volume change of Si during (de)lithiation. Herein, beginning by figuring out the unique electrochemical behavior of Si anode in sulfide-based ASSBs, which arises from the distinct solid–solid interface dynamics, the recent comprehensive strategies are explored for the effective integration of Si anodes in sulfide-based ASSBs. By deepening our understanding of the failure mechanism of Si anode in sulfide-based ASSBs and drawing from well-established strategies developed for Si anodes in LIBs, we propose actionable insights for overcoming the limitation of Si anode in sulfide-based ASSBs.