Material Exploration and Solution Strategies for High Performance All-Solid-State Batteries

Solid-state batteries (SSB) are a promising, next generation energy storage technology for electric vehicles. These batteries employ a lithium metal anode and high voltage cathode coupled with a solid electrolyte (SE). As a result, these batteries can provide high energy density, improved safety and lower costs compared to conventional Li-ion batteries. While promising, this technology suffers from several lingering challenges that need to be addressed in terms of materials development, processing and integration. My thesis work involves material exploration for SE materials and solution strategies for processing, performance and durability of SSBs. Specifically, I have explored roll-to-roll processing of garnet-type SE materials for development of thin-robust SE film which is critical in realizing high energy density SSBs. Additionally, I have developed facile electrochemical approaches that can improve interfacial resistance at anode | SE interface and eliminate dendrites upon their formation from the bulk of the SE. I have revisited NASICON material family to identify high performance SE material alternatives. Electrochemical and chemical ion exchange strategies were explored to assess the possibility of synthesizing Li based NASICON materials with high Li-ion concentration in rhombohedral symmetry. Finally, a co-sintering process was explored for development of a dense-defect-free composite cathode. The results of these studies is likely to provide pathways towards development of high performing material alternatives for solid electrolytes, scalable processing and integration as well as extended durability of operational solid-state batteries.