This project aims to identify and address key technical barriers in scale-up synthesis and roll-to-roll processing of highly conductive solid-state electrolytes (SSEs) by leveraging PNNL’s patent-pending SSEs, Ampcera Inc.’s environmentally friendly manufacturing capability, and UW’s roll-to-roll processing. The ultimate goals are 1) development of novel sulfide SSEs with room-temperature Li+ conductivity > 5 mS/cm and Li/SSE interfacial resistance 1 mS/cm) and ultra-thin solid film (10-100 µm). The materials and the solid film achieved in the project will be tested at practical conditions and validated in a realistic pouch cell format with achievable energy > 300 Wh/Kg.