Toward Garnet-Based Electrolyte Li-Metal Batteries: A Highly Effective Solid-State Electrolyte- Li Metal Interface

Abstract

The widespread adoption of electric-powered vehicles (electric vehicles, plug-in hybrids, etc.) stimulated the desire to pursue solid-state batteries (SSBs) with energy densities beyond those of lithium-ion batteries as well as long cycle life and safety. Many technological elements are involved in successful development and commercialization of SSBs, including solid-state electrolyte (SSE) materials, ionic conductivity enhancement, electrolyte/electrode interface stability, enabling Li metal anode, cell and pack manufacturing methods, battery management system, and battery pack design. The principle focus of this talk will be a discussion centered on charge transfer at the Li metal-SSE interface and its effect on electrolyte/electrode interface stability during Li plating/striping to enable Li metal anode. Further discussion will focus on the impact of lithiated interfacial coating layers on the interfacial impedance, which has enabled the uniform plating of Li at the Li-SSE interfaces. In this study, garnet-type oxide with nominal composition of Li7La3Zr2O12 (LLZO) has been used as model system due to its simultaneous fast-ion conductivity and stability against metallic Li.