Li6PS5Cl/MoS2 hybrid electrolyte integrates high sulfur conversion kinetics with stable lithium metal interfaces in all-solid-state lithium-sulfur batteries

All-solid-state lithium-sulfur batteries (ASSLSBs) are emerging as a promising candidate for next-generation energy storage systems, attributed to their high theoretical energy density and superior safety profile. However, the practical implementation of these batteries has been impeded by several critical challenges, including sluggish sulfur conversion kinetics, unstable lithium metal interfaces, and inadequate compatibility between electrolytes and electrodes. In this study, we introduce a novel Li₆PS₅Cl/MoS₂ hybrid electrolyte designed to overcome these obstacles. The hybrid electrolyte significantly enhances solid-phase sulfur conversion through the catalytic activity of MoS₂ while concurrently stabilizing the electrolyte-lithium metal interface. The incorporation of Li₆PS₅Cl improves ionic conductivity and mechanical stability, effectively mitigating lithium dendrite formation and suppressing polysulfide shuttle effects. As a result, Li-Li symmetric batteries assembled with the Li₆PS₅Cl/MoS₂ electrolyte exhibited stable cycling for over 2500 hours. Additionally, ASSLSBs employing this hybrid electrolyte demonstrated a high specific capacity of 735.68 mAh g^-1 after 338 cycles at 0.1 C, with notable capacity retention. Even after 65 cycles at 0 ℃, the specific capacity remained at 626.5 mAh g^-1. These results highlight the potential of hybrid electrolytes in propelling the advancement of ASSLSBs, paving the way for high-performance, durable energy storage solutions.