Stable Anodeless Solid-State Batteries Enabled by Carbon-Metal Based Artificial Interface

Anodeless system maximizes all-solid-state batteries’ advantages of energy density and stability. Sulfide-based solid electrolytes exhibit high ionic conductivity and processability, but the narrow electrochemical stability window causes electrolyte decomposition. A preferential strategy to suppress electrolyte decomposition is limiting contact area between lithium metal and electrolyte by the introduction of protective layer, such as carbon-metal layer, between the current collector and the sulfide-based electrolyte layer is one example. In this presentation, we report protective capability of carbon only layer and carbon-metal layer using various electrochemical and analytical characterization technics. Cross sectional images of charged, discharged state of these two anodeless systems demonstrate carbon-metal layer could regulate the site for lithium plating and spatially separate the solid state electrolyte and lithium deposited layer. From these results, we will discuss the key parameters for stable operation of Li metal free anode for all solid-state battery systems.