Solid-state electrolytes (SSEs) are key enablers of next-generation lithium battery systems, offering enhanced safety, higher energy density, and greater design flexibility compared to conventional lithium-ion batteries (LIBs). This work presents a comparative overview of major SSE chemistries, including sulfide, halide, oxide, and polymer-based electrolyte systems, highlighting their unique advantages and ongoing challenges. Particular emphasis is placed on interfacial stability, chemical compatibility, and mechanical integrity, which remain critical obstacles to reliable device integration and long-term performance.

Scalable fabrication methods are discussed, ranging from traditional approaches such as dry processing and wet chemistry (e.g., tape casting) to advanced techniques like thin-film deposition and additive manufacturing. These processes are evaluated in terms of densification, throughput, and compatibility with industrial workflows. Case studies illustrate the transition from laboratory-scale prototypes to pilot-scale production, with a focus on process optimization, reproducibility, and quality control.

The work also explores future directions for the sustainable and large-scale use of solid-state batteries (SSBs). Topics include recycling strategies, circular material flows, and the integration of AI-assisted materials research to accelerate innovation and shorten development cycles. These approaches aim to bridge the gap between academia and industrial implementation, supporting the advancement of robust, scalable, and environmentally responsible solid-state battery technologies.

By combining materials science insights with engineering perspectives, this presentation contributes to the broader effort to enable commercially viable solid-state batteries for electric vehicles, consumer electronics, and grid storage applications.