University of California

Lg Energy Solution, Ltd.

Jeong Woo Oh

Ke Zhou

Mengchen Liu

Min-Sang Song

Min Sang Song

Junghwa Hong

The present disclosure provides additive materials to be added to sulfide-containing solid electrolyte materials for use in solid state batteries, solid state batteries using such additive materials in their solid electrolyte materials, and methods of making such solid state batteries. The additive materials provided herein allow the solid state batteries using such additive materials to operate under relatively lower pressures compared to solid state batteries without such additive materials.

Solid state batteries and methods of making thereof

Solid electrolyte compositions and solid-state batteries are disclosed, which comprise a solid electrolyte layer including a sulfide-containing solid-state electrolyte material and a compound of Chemical Formula 1. The sulfide-containing solid-state electrolyte material includes but is not limited to LiPSCl ('LPSC'), an LPS-based glass or glass ceramic of formula xLiS·yPS, wherein x+y=1, or an argyrodite-based sulfide-based solid electrolyte or formula LiPSX, wherein X═Cl, Br, or I) or LiPSCl, where y is <1. In some aspects, the compound of Chemical Formula 1 is sodium 3-mercapto-1-propanesulfonate (3M1P).

Methods for improving critical current density in a sulfide-based all-solid-state lithium-ion battery

Solid electrolyte compositions and solid-state batteries are disclosed, which comprise a solid electrolyte layer including a sulfide-containing solid-state electrolyte material and a compound of Chemical Formula 1. The sulfide-containing solid-state electrolyte material includes but is not limited to LiPSCl ('LPSC'), an LPS-based glass or glass ceramic of formula xLiS·yPS, wherein x+y=1, or an argyrodite-based sulfide-based solid electrolyte or formula LiPSX, wherein X=Cl, Br, or I) or LiPSCl, where y is <1. In some aspects, the compound of Chemical Formula 1 is sodium 3-mercapto-1-propanesulfonate (3M1P).

Disclosed is a sulfide-containing solid electrolyte material with an organic coating, as well as densified pellets containing this solid electrolyte material, a solid electrolyte thereof, and a solid state battery containing the solid electrolyte. According to aspects of the disclosure, the coating comprising a compound of Chemical Formula (1) or Chemical Formula (2) is formed on the surface of a sulfide-containing solid electrolyte material, e.g., the organic coating may comprise a compound having a thiol with a long hydrophobic tail, such as 1-undecanethiol. The coating provides densification of sulfide-containing solid electrolyte materials, and facilitates the ionic and lithium atomic diffusion coefficient at sulfide grain boundaries during pressing, thus achieving the densification of sulfide solid state electrolyte.

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San Diego, CA, United States of America

Jeong Woo Oh