Development, Structure, and Mechanical Properties of Sulfide Solid Electrolytes

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The development of sulfide solid electrolytes having a high lithium ionic conductivity for all-solid-state batteries is ongoing. The development of a solid electrolyte with a high ionic conductivity is key to forming a path for the continuous conduction of sufficient ions or/and electrons to an active material. The mechanical property of the sulfide electrolytes contributes to forming a good contact at solid–solid interfaces between solid electrolytes and electrode active materials, leading to realizing all-solid-state batteries with excellent electrochemical performances. The development of sulfide solid electrolytes, typical glassy structures, and their mechanical properties are summarized in this article.