Sulfide-based lithium-ion-conducting solid electrolyte glass, all-solid lithium secondary battery, and method for manufacturing all-solid lithium secondary battery

An all-solid lithium secondary battery comprising:

• a sulfide-based lithium-ion-conducting solid electrolyte as a solid electrolyte glass, the sulfide-based lithium-ion-conducting solid electrolyte containing α-alumina and a lithium containing compound selected from the group consisting of Li2S—SiS2, Li2S—SiS2—LiI, Li2S—SiS2—LiBr, Li2S—SiS2—LiCl, Li2S—SiS2—B2S3—LiI, Li2S—SiS2—P2S5—LiI, Li2S—B2S3, Li2S—P2S5, Li2S—P2S5—LiI, Li2S—P2S5-ZmSn, and Li2S—GeS2 wherein,
• Z=Ge, Zn, Ga,
• m is integer except 0, and
• n is integer except 0,
• α-alumina is mixed in the sulfide-based lithium-ion-conducting solid electrolyte in a range of from 5 to 7 wt % based on the weight of the sulfide-based lithium-ion-conducting solid electrolyte, and
• the chemical constituents in the lithium containing compound are chemically bonded together.

A solid electrolyte glass comprising:

• a sulfide-based lithium-ion-conducting solid electrolyte,
• wherein the sulfide-based lithium-ion-conducting solid electrolyte consists essentially of α-alumina and a lithium containing compound selected from the group consisting of Li2S—SiS2, Li2S—SiS2—LiI, Li2S—SiS2—LiBr, Li2S—Sis2—LiCl, Li2S—SiS2—B2S3—LiI, Li2S—SiS2—P2S5—LiI, Li2S—B2S3, Li2S—P2S5—LiI, Li2S—P2S5-ZmSn, and Li2S—GeS2 wherein,
• Z=Ge, Zn, Ga,
• m is integer except 0, and
• n is integer except 0, and
• the solid electrolyte glass is formed by heating and melting a mixture that consists essentially of the α-alumina and the lithium containing compound, and cooling the mixture that is heated and melted.