Samsung Sdi Co., Inc.

Sejong University

Kyulin Lee

Sangil Han

Jungmin Han

Minsang Song

Jeongdoo Yi

Younggyoon Ryu

Dongrak Sohn

Jinhee Lee

Jinkyu Kim

Byeonggyu Cho

Jeonghye Lee

Yunchae Jung

Sunggeun Shim

Keesun Sohn

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

An all-solid secondary battery includes a cathode; an anode including natural graphite; and a solid electrolyte layer between the cathode and the anode, wherein the natural graphite has an average particle diameter (D50) in a range of greater than about 10 μm to about 20 μm or less and includes an amorphous carbon coating layer.

All-solid secondary battery

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

Kyulin Lee