SOLID ELECTROLYTE FILM FOR SULFIDE-BASED ALL-SOLID-STATE BATTERIES
A solid electrolyte film for sulfide-based all-solid-state batteries, and more particularly a composition of a solid electrolyte, a binder, and a solvent used to manufacture a solid electrolyte film for sulfide-based all-solid-state batteries that is thin and has high ion conductivity. In particular, a solid electrolyte film composition for sulfide-based all-solid-state batteries including a solvent having a dielectric constant of x (1.5<x<3.0). The thickness of a solid electrolyte film for sulfide-based all-solid-state batteries manufactured using the solid electrolyte film composition is 60 μm or less, and the solid electrolyte film is capable of being stably used for at least 1000 hours or more, and up to 2000 hours, based on the evaluation of Li plating and stripping.
1 . A solid electrolyte film composition for sulfide-based all-solid-state batteries, the solid electrolyte film composition comprising:
a sulfide-based solid electrolyte;
a polymer binder comprising C and H therein but not comprising any of O, N, and F therein; and
a solvent having a dielectric constant of x, wherein 1.0<x<3.1.
2 . The solid electrolyte film composition according to claim 1 , wherein the sulfide-based solid electrolyte is at least one of Li 6 PS 5 , Li 6 PS 5 Cl, Li 3 PS 4 , Li 10 GeP 2 S 12 , Li 3.25 Ge 0.25 P 0.75 S 4 , Li 2 S—P 2 S 5 —LiCl, Li 2 S—SiS 2 , LiI—Li 2 S—SiS 2 , LiI—Li 2 S—P 2 S 5 , LiI—Li 2 S—P 2 O 5 , LiI—Li 3 PO 4 —P 2 S 5 , Li 2 S—P 2 S 5 , Li 7 P 3 S 11 , LiI—Li 2 S—B 2 S 3 , Li 3 PO 4 —Li 2 S—Si 2 S, Li 3 PO 4 —Li 2 S—SiS 2 , LiPO 4 —Li 2 S—SiS, Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 , or Li 7 P 3 S 11 .
3 . The solid electrolyte film composition according to claim 2 , wherein the sulfide-based solid electrolyte is at least one of Li 6 P 5 , Li 6 PS 5 Cl, or Li 7 P 3 S 11 .
4 . The solid electrolyte film composition according to claim 1 , wherein the polymer binder is at least one of styrene-ethylene-butylene-styrene (SEBS), styrene-butadiene-styrene (SBS), or styrene-butadiene rubber (SBR).
5 . The solid electrolyte film composition according to claim 4 , wherein the polymer binder is SEBS.
6 . The solid electrolyte film composition according to claim 1 , wherein the solvent is at least one of benzene, CCl 4 , hexane, cyclohexane, heptane, or xylene.
7 . The solid electrolyte film composition according to claim 6 , wherein the solvent is at least one of hexane, heptane, or xylene.
8 . A solid electrolyte film for sulfide-based all-solid-state batteries manufactured using the solid electrolyte film composition according to claim 1 .
9 . A sulfide-based all-solid-state battery comprising the solid electrolyte film according to claim 8 .
10 . The sulfide-based all-solid-state battery according to claim 9 , wherein an ion conductivity of the solid electrolyte film is 10 −4 S/cm or more.