Mitsui Minings & Melting Co., Ltd.

Hideo Uesugi

Takahiro Ito

Takashi Chikumoto

Hitohiko Ide

Tsukasa Takahashi

Norihiko Miyashita

Takashi Muranaka

Provided is a sulfide-based solid electrolyte which is capable of suppressing the generation of hydrogen sulfide caused by reaction with moisture even when in contact with dry air in a dry room or the like, and capable of maintaining lithium ion conductivity. Proposed is a sulfide-based solid electrolyte for a lithium secondary battery, wherein the surface of a compound containing lithium, phosphorus, sulfur, and halogen, and having a cubic argyrodite-type crystal structure is coated with a compound containing lithium, phosphorus, and sulfur, and having a non-argyrodite-type crystal structure.

Sulfide-based solid electrolyte for lithium secondary battery

As a novel sulfide compound having a low elastic modulus while retaining the high ion conductivity, a sulfide compound for a solid electrolyte of a lithium secondary battery that includes a crystal phase of a cubic argyrodite type crystal structure, and is represented by the compositional formula: LiPSClBr, wherein x in the compositional formula satisfies x=y+z and 1.0&#x3c;x&#x2264;1.8, and a ratio (z/y) of the molar ratio of Br to the molar ratio of Cl is from 0.1 to 10.0 is proposed.

Solid electrolyte of lithium secondary battery and sulfide compound for said solid electrolyte

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Hiroshima, Japan

Hideo Uesugi