Samsung Sdi Co., Inc.

Sejong University

Dongrak Sohn

Jungmin Han

Minsang Song

Jeongdoo Yi

Sangil Han

Younggyoon Ryu

Kyulin Lee

Jinhee Lee

Yunchae Jung

Keesun Sohn

Sunggeun Shim

Minjin Song

A sulfide solid electrolyte for an all-solid secondary battery includes lithium, phosphorus, sulfur, oxygen, and halogen atoms, wherein the sulfide solid electrolyte has an argyrodite-type crystal structure, the halogen atoms includes chlorine and at least two of bromine, iodine, and fluorine, an atomic ratio of sulfur to oxygen in the sulfide solid electrolyte is about 4 or higher, and an atomic ratio of chlorine to the at least two of bromine, iodine, and fluorine is about 9 or higher.

Sulfide solid electrolyte for all-solid secondary battery, method of preparing the same, and all-solid secondary battery including the same

A sulfide solid electrolyte for all-solid secondary batteries, a method of preparing the same, and an all-solid secondary battery, the sulfide solid electrolyte including lithium, phosphorus, sulfur, and a halogen, wherein: the sulfide solid electrolyte has an argyrodite-type crystal structure, a ratio (I/Iratio) of a peak intensity at a 2θ of 29±0.1° to a peak intensity at a 2θ of 30±0.1° is 0.06 or less, the peak intensities being obtained by X-ray diffraction analysis of the sulfide solid electrolyte, and a ratio (I/Iratio) of a peak intensity at a 2θ of 27.1±0.1° to a peak intensity at a 2θ of 30±0.1° is 0.06 or less, the peak intensities being obtained by X-ray diffraction analysis of the sulfide solid electrolyte.

Sulfide solid electrolyte for all-solid secondary battery, method of preparing same, and all-solid secondary battery including the same

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Yongin-si, South Korea

Dongrak Sohn