Scalable fabrication of sheet-type electrodes for practical all-solid-state batteries employing sulfide solid electrolytes

The limited safety and energy density of conventional lithium-ion batteries have triggered the research and development of all-solid-state Li or Li-ion batteries (ASLBs). Sulfide solid electrolytes possess the remarkable advantages combining high ionic conductivity and mechanical deformability that allows for simple cold-pressing based fabrication of the cells. For this reason, these electrolytes find promising application in practical ASLBs. However, the large gap between experimental laboratory research and practical applications poses a formidable challenge. Herein, recent studies on scalable fabrication strategies for ASLBs employing sulfide solid electrolytes are discussed. The critical factors for wet-slurry and dry-film fabrication methods are reviewed. Based on these results, recent developments in slurry-processing solvents, polymeric binders, and fabrication protocols are summarized. Finally, the advantages and disadvantages of the two fabrication protocols are summarized, along with prospects for future research.