Abstract: A sulfide solid electrolyte includes: a Li element; a P element; a S element; and a Ha element. The sulfide solid electrolyte has an argyrodite crystal structure. The crystal structure includes a plurality of PS4 tetrahedrons where the P element may be substituted and at least a part of the S elements may be substituted. The crystal structure includes 16 elements serving as the vertices of the PS4 tetrahedrons T1 in a unit cell. When the 16 elements are made to correspond to 16 S elements constituting vertices corresponding to 16e sites of PS4 tetrahedrons T2 in a space group F-43m, an average value of a distance ? between respective positions of the 16 elements in the PS4 tetrahedrons T1 and respective positions of the 16 S elements in the PS4 tetrahedrons T2 corresponding thereto is 0.05 ? to 0.30 ?.

Abstract: A method for producing a sulfide solid electrolyte includes: mixing a raw material containing a Li element, a raw material containing a P element, and a raw material containing an S element to obtain a raw material mixture; and heat-treating the raw material mixture. Li2Sx (0.05?x?0.95) is used as the raw material containing the S element, the heating treatment is performed while introducing a gas containing an S element, and a cumulative introduction amount Y (mass %) of the S element in the gas containing the S element with respect to a mass of the raw material mixture satisfies a relationship of Y?x2?6.5x+5.8 with respect to the x in the Li2Sx.

Abstract: The present invention relates to a method for producing a sulfide solid electrolyte includes: supplying a sulfide solid electrolyte raw material into a furnace; heating and melting the sulfide solid electrolyte raw material; and discharging an obtained melt to an outside of the furnace through a heated flow path to perform cooling.

Abstract: A sulfide solid electrolyte includes a sulfide glass phase. The sulfide solid electrolyte includes a PS4 unit and a P2S7 unit, a ratio of a peak intensity I(PS4) of the PS4 unit and a peak intensity I(P2S7) of the P2S7 unit in a Raman spectrum satisfies a relationship of 0.05<{I(P(P2S7)/I(PS4)}<1.00, the sulfide solid electrolyte includes Li, P, S, and Ha as constituent elements, the Ha is a halogen element, and contents of the constituent elements in terms of at % are as follows: Li: 30% to 50%, P: 5% to 15%, and S: 30% to 60%.

Abstract: A sulfide-based solid electrolyte powder emits photo-luminescence light between a wavelength of 660 nm to 750 nm. A photo-luminescence peak ratio may be 0.2 or more in a Raman spectrum obtained by excitation with light having a wavelength of 532 nm as represented by the following formula: Photo-luminescence peak ratio=integrated intensity of peak in Raman shift region of 4300 cm?1 to 4500 cm?1/integrated intensity of peak in Raman shift region of 400 cm?1 to 450 cm?1.

Abstract: A method for producing a sulfide-based solid electrolyte includes: heating and melting a first sulfide-based solid electrolyte raw material in a furnace to obtain a first melt; supplying a second sulfide-based solid electrolyte raw material to the first melt; heating and melting an obtained mixture in a gas atmosphere containing a sulfur element; and cooling an obtained second melt.

Abstract: Provided is a method for producing a substance containing an alkali metal element and a sulfur element. A raw material containing the alkali metal element and the sulfur element is placed in a porous container and heated and melted to obtain a melt, and the melt is stirred by an inert gas flowed to an outside of the porous container.

Abstract: A method for producing a sulfide-based solid electrolyte using a production apparatus including an introduction portion and a heating portion includes introducing a raw material into the introduction portion of the production apparatus and transferring the raw material to the heating portion whose temperature is higher than that of the introduction portion, and then heating and melting the raw material. A dew point of the introduction portion is ?65° C. to ?25° C.

Abstract: A method for producing a sulfide-based solid electrolyte includes obtaining a sulfide-based solid electrolyte recycled product (B) from a liquid in which a sulfide-based solid electrolyte (A) in a sulfide-based solid electrolyte-containing mixture is dissolved in an organic solvent. The sulfide-based solid electrolyte-containing mixture contains the sulfide-based solid electrolyte (A) and another substance insoluble in the organic solvent.

Abstract: A sulfide solid electrolyte having an ignition time of 5 seconds or more or is non-ignitable when an ignition test is performed using a prescribed test method in a dry air atmosphere, and having a value of S5 nm/S100 nm of 0.6 or less when S5 nm is an elemental ratio of sulfur (S) at a depth of 5 nm from a surface and S100 nm is an elemental ratio of sulfur (S) at a depth of 100 nm from the surface, as measured by X-ray photoelectron spectroscopy.

Abstract: The present invention relates to a sulfide solid electrolyte powder to be used for a lithium-ion secondary battery, and the sulfide solid electrolyte powder includes: at least one of a crystal phase including Li, P, and S, and an amorphous phase including Li, P, and S, in which a 1H-NMR intensity is 0.3 or more, and a BET specific surface area (m2/g) and the 1H-NMR intensity satisfy a relationship of 2?(BET specific surface area×1H-NMR intensity).

Abstract: The sulfide solid electrolyte of the present invention includes: an argyrodite crystal phase including Li, P, S, and Ha, in which the Ha is one or more halogen elements including at least Cl, a content ratio represented by [Ha]/[P] (atomic ratio) is 1.3 or more, where [P] is a content of the P and [Ha] is a total content of the Ha, and in a 35Cl-NMR spectrum, an area intensity ratio represented by SB/SA is 3.5 or more, where SA is an area intensity of a peak observed at 0 ppm to 30 ppm and SB is an area intensity of a peak observed at ?150 ppm to 0 ppm, or a peak is observed at ?150 ppm to 0 ppm and no peak is observed at 0 ppm to 30 ppm.

Abstract: A sulfide solid electrolyte includes: a crystal phase and an anion, in which the phase includes an argyrodite crystal including Li, P, S, and Ha, the Ha is at least one element selected from F, Cl, Br, and I, the anion includes an oxide anion having a P—O bond, at least a part of the oxide anion is different from an anion constituting the argyrodite crystal and constitutes a polyanionic structure, when an entire composition of the electrolyte is LiaMSbHacOx, certain relationships are satisfied, the M is at least one element selected from a metal element and a metalloid element in groups 2 to 15 of a periodic table, the at least one element including P, and 60% or more of a total content of O is bonded to the M.

Abstract: The present invention relates to a method for producing a sulfide solid electrolyte, the method including: dry-pulverizing a sulfide solid electrolyte material in an atmosphere with a dew point of ?70° C. or higher and ?30° C. or lower to produce a sulfide solid electrolyte powder. An oxygen concentration in the atmosphere may be 0.1 ppm or more and less than 5%.

Abstract: The present invention relates to a sulfide solid electrolyte to be used for a lithium-ion secondary battery. The sulfide solid electrolyte contains: an argyrodite crystal containing Li, P, S, and Ha (F, Cl, Br, and I). Relationships of {(1/?(S))×[S2-]0+(1/?(O))×[O2-]0+(1/?(Br))×[Br?]0+(1/?(Cl))×[Cl?]0+(1/?(F))×[F?]0}?0.33 and [S2-]0+[O2-]0+[Br?]0+[Cl?]0+[F?]0=1 are satisfied, where [S2-]0, [O2-]0, [Br?]0, [Cl?]0, and [F?]0 are surface anion contents, and ? is an electronegativity thereof.

Abstract: The present invention relates to a sulfide solid electrolyte to be used for a lithium-ion secondary battery, the sulfide solid electrolyte including: an argyrodite crystal including Li, P, S, and Ha, in which the Ha represents at least one element selected from the group consisting of F, Cl, Br, and I, and the Ha includes at least one of Cl and Br, the argyrodite crystal satisfies at least one of requirements (A) and (B), and in the argyrodite crystal, relationships of {(1/?(S))×[S2?]+(1/?(O))×[O2?]+(1/?(Br))×[Br?]+(1/?(Cl))×[Cl?]+(1/?(F))×[F?]}?0.36 and [S2?]+[O2?]+[Br?]+[Cl?]+[F?]=1 are satisfied.

Abstract: The present invention relates to a sulfide solid electrolyte to be used in a lithium-ion secondary battery, including an argyrodite crystal structure including Li, P, S, and Ha, in which Ha is at least one selected from the group consisting of F, Cl, Br, and I, the sulfide solid electrolyte has a peak in at least one selected from the group consisting of 140 cm?1 to 170 cm?1, 205 cm?1 to 235 cm?1, and 460 cm?1 to 490 cm?1 in a Raman spectrum obtained by Raman spectroscopy measurement, and the sulfide solid electrolyte does not have an endothermic peak within a range of 70° C. to 160° C. in a DSC curve obtained by differential scanning calorimetry.

Abstract: A sulfide solid electrolyte to be use in a lithium-ion secondary battery includes an argyrodite crystal structure represented by LiaPSbHac (where 5?a?7, 4?b?6, and 0<c?2, and Ha represents a halogen element), in which in an X-ray diffraction spectrum using a Cu-K? ray, the argyrodite crystal structure has a peak A and a peak B, each having a full width at half maximum of 0.07° or more, within a range of 2?=30.3°±0.5°, and a difference between diffraction angles (2?) of the peak A and the peak B is 0.05° or more.

Abstract: A sulfide solid electrolyte to be used in a lithium-ion secondary battery, including an argyrodite crystal, in which the crystal is represented by a composition formula Lia—M—Zb—Hac; M is at least one element selected from Na, K, and elements each of which exists as any of divalent to pentavalent cations in the crystal; Z is at least one element selected from elements that exists as a divalent anion in the crystal; Z includes S; Ha is at least one element selected from the group consisting of F, Cl, Br, and I; a, b, and c in the composition formula indicate a ratio among contents (unit: at%) of the respective elements and satisfy 5 < a < 7, 4 < b < 6, and 0 < c < 2; and a maximum distance between Li ions in the crystal is 2.54 ? or shorter.

Abstract: A manufacturing method of a sulfide solid electrolyte, includes: heat-treating a starting material containing a lithium element, a sulfur element, and a phosphorous element to obtain an intermediate; and heating and melting the intermediate in an atmosphere of a gas comprising a sulfur element. In the heat treatment, the starting material may be heated at a temperature in a range of 250° C. to 500° C.