Lithium Deposition Behavior of Anode-Free Solid-State Lithium Secondary Batteries with Carbon-Based Composite Layer

Anode-free solid-state lithium secondary batteries are one of the most promising next-generation energy storage systems to improve gravimetric and volumetric energy density. Among various types of solid electrolytes, inorganic sulfide solid electrolytes have drawn attention due to their high ionic conductivity and good scalability. However, low Coulombic efficiency because of its absence of excess lithium source and poor cycle life caused by high chemical reactivity between lithium metal and sulfide solid electrolyte are key issues to be solved. In this work, we compared lithium plating and stripping behaviors of current collectors with and without amorphous carbon-containing composite layer by using various electrochemical and analytical characterization methods. We demonstrate types of material, ratio, or microstructure of the composite layer could affect overall electrochemical performance of the battery. The corresponding morphological difference of deposited lithium will be discussed further in the presentation.