Hybrid Li‐S pouch cell with a reinforced sulfide glass solid‐state electrolyte film separator

In this paper, sulfide glass electrolyte powder with a nominal composition of (Li 2 S) 60 (SiS 2 ) 28 (P 2 S 5 ) 12 is hot pressed at a 330°C and 12 MPa into separator films using non‐woven fiberglass reinforcement. The reinforced separator films are 93% dense, bendable, and have an ionic conductivity of 0.7 mS/cm at room temperature. When integrated into hybrid Li‐S coin cells with liquid electrolyte, these reinforced glass separators blocked the parasitic polysulfide shuttle sufficiently to enable reversible cycling without LiNO 3 co‐salt. Furthermore, the scalability of the reinforced glass separator technology is demonstrated by assembling and testing a hybrid single‐layer pouch cell.