Advancements in Solid-State Batteries Overcoming Challenges in Energy Density and Safety - Review

Abstract

Solid-state batteries (SSBs) have emerged as a promising alternative to conventional lithium-ion batteries (LIBs), offering higher energy density, improved safety, and longer cycle life. This review explores recent advancements in SSB technology, focusing on the development of solid electrolytes, electrode materials, and interface engineering. Solid electrolytes, including oxide-based (Li7La3Zr2O12), sulfide-based (Li10GeP2S12), and polymer-based (PEO-LiTFSI) materials, are critical to SSB performance. While oxide-based electrolytes provide high ionic conductivity and stability, sulfide-based electrolytes offer ultra-high conductivity but suffer from air sensitivity. Polymer-based electrolytes are flexible and easy to process but exhibit low conductivity at room temperature. Key challenges such as high interfacial resistance, dendrite formation, and volume changes are addressed through strategies like surface modification, composite electrodes, and 3D architectures. Advanced characterization techniques, including in situ transmission electron microscopy (TEM) and X-ray tomography, provide insights into structural and chemical changes during operation. Computational modeling, such as density functional theory (DFT) and molecular dynamics (MD), accelerates material discovery and interface optimization. Despite significant progress, challenges remain in scalability, performance, and safety. Future research should focus on developing scalable fabrication methods, optimizing electrode-electrolyte interfaces, and integrating SSBs with renewable energy systems for grid storage and electric vehicles. SSBs have the potential to revolutionize energy storage, enabling the widespread adoption of renewable energy and reducing greenhouse gas emissions. Continued innovation and collaboration across disciplines will be essential to overcome remaining challenges and unlock the full potential of SSBs.