Toward favorable ionic contacts in sulfide-based bulk-type all-solid-state Li and Na Batteries

Abstract

Recently, composite-structured bulk-type all-solid-state lithium batteries (ASLBs) using inorganic solid electrolytes (SEs) have been emerging as a promising alternative battery for large-scale applications such as electric vehicles (EVs) and energy storage systems (ESSs) because of their ultimate safety and scalable fabrication.1 Sulfide SE materials are key to the bulk-type ASLBs because of their high ionic conductivities (10-4-10-2 S cm-1) and deformability which enables two-dimensional contacts with active materials by simple cold-pressing.1 However, achieving high-surface-coverage wetting of active materials by SEs via conventional protocols to fabricate composite electrodes is limited. Very recently, our group developed highly conductive and dry-air stable solution-processable Li- and Na-ion SEs by using cheap and environmentally benign elements and solvents. In this presentation, we will present our updated results of the solution-processable LiI-Li4SnS4 and Li3SbS4-based SEs and their application for SE-coating on active materials for all-solid-state Li-ion and Na-ion batteries.