Outlook of Solid-State Electrolytes: A Boost in Next-Generation Li-Metal-Based Solid-State Batteries

Solid-state electrolytes (SSEs) are emerging as highly promising alternatives to conventional organic liquid electrolytes due to their exceptional performance across a broad spectrum of temperatures, enhanced safety profiles, and superior energy densities. Their intrinsic properties, including thermal and electrochemical stability, significant ionic conductivity, and notable energy density, position SSEs at the forefront of next-generation rechargeable battery technologies. This review provides a comprehensive examination of the latest advancements in SSE technology, encompassing a diverse array of materials including thioborates, hydroborates, silicates, lithium nitrogen sulfides (LNS) with antifluorite structures, double perovskites, double antiperovskites, and composite polymer electrolytes. Moreover, this review depicts a brief overview of various fabrication techniques for thin-film electrolytes, highlighting the intricacies of each method and thereby offering insightful perspectives that are valuable for future researchers and scientists aiming to advance this field.