b'Development,Sulfide-based solid-state electrolytes provide safer and more characterization, andeffective high-energy batteries for the transportation sector.testing of solid-stateT his research was conducted to manufacture sulfide-based solid-state electrolytes for high-energy lithium metal batteries. A key component of electrolytes for batteries this research was to investigate the impacts of different manufacturing parameters for dry ball milling of lithium sulfide and phosphorous pentasulfide to form lithium thiophosphate electrolyte. This includes observing crystalline versus amorphous structure, resulting pellet density and color, as well as resulting electrochemical capabilities such as the ability to transfer ions through the electrolyte and across electrode interfaces. Failing to cover all the necessary PROJECT NUMBER:parameters used in the dry ball milling process causes high variability of resulting 22P1066-006FP electrochemical capabilities and could be a key reason for the poor incremental improvements of dry ball-milled solid-state electrolytes in recent years. In addition, TOTAL APPROVED AMOUNT:artificial coatings on lithium metal anode were investigated to observe the impact $191,120 over 2 years of interfacial interactions between electrolyte and electrode. Here, the use of a PRINCIPAL INVESTIGATOR:lithium fluoride coating created a greater hindrance in interfacial ionic transport Corey Efaw, Russell L. Heathin comparison to lithium iodide. However, both were worse in performance as Postdoctoral Fellow compared to pure lithium, although the long-term effects such as degradation after extended usage have not yet been observed. Including a coating, especially one COLLABORATORS: that has positive interaction with the electrolyte, could result in improved cyclability Boise State University and safety of a solid-state battery. Collaboration with Boise State University and the Center for Advanced Energy Studies Center for Advanced Energy Studies was established to access their high-resolution characterization tools. Additional internal collaboration at INL was established to develop solid-state electrolyte processing procedures and characterization.132'