There is provided an inorganic solid electrolyte-containing inorganic solid electrolyte-containing composition, a dispersion medium, and a polymer binder, where a component constituting the polymer binder contains a soluble polymer having a combination of specific functional groups or partial structures. There are also provided a sheet for an all-solid state secondary battery and an all-solid state secondary battery, in which this inorganic solid electrolyte-containing composition is used, as well as manufacturing methods for a sheet for an all-solid state secondary battery, and an all-solid state secondary battery.

The present invention relates to a concrete composite comprising concrete and a thermoelectric material, wherein the thermoelectric material comprises a complex sulphide mineral, wherein the composite comprises at least 20 wt % concrete.

The present invention relates to a concrete composite comprising concrete and a thermoelectric material, wherein the thermoelectric material comprises a complex sulphide mineral, wherein the composite comprises at least 20 wt % concrete.

A solid electrolyte contains at least elemental lithium (Li), elemental phosphorus (P), elemental sulfur (S), elemental halogen (X), and elemental oxygen (O), and has a crystalline phase with an argyrodite-type crystal structure. In the solid electrolyte, the molar ratio of the elemental halogen (X) to the elemental phosphorus (P), X/P, is more than 1.0 and less than 2.4, and the molar ratio of the elemental oxygen (O) to the elemental phosphorus (P), O/P, is more than 0 and less than 0.5. In an X-ray diffraction pattern, the solid electrolyte exhibits: peak A in the range of 2θ=21.6° to 22.6°, peak B in the range of 2θ=22.7° to 23.7°; and peak C in the range of 2θ=35.8° to 36.8°, the X-ray diffraction pattern being obtained by an X-ray diffractometer (XRD) using CuKα1 radiation.

Disclosed is a method for producing a sulfide-based solid electrolyte containing an alkali metal, a sulfur element, a phosphorus element and a halogen element, including performing a reaction of an alkali metal sulfide and a substance containing at least one element of a sulfur element, a phosphorus element and a halogen element in an organic solvent having an electron-withdrawing group. The method provides a sulfide-based solid electrolyte having a high ion conductivity.

A sulfide solid electrolyte, which is able to adjust the morphology unavailable traditionally, or is readily adjusted so as to have a desired morphology, the sulfide solid electrolyte having a volume-based average particle diameter measured by laser diffraction particle size distribution measurement of 3 μm or more and a specific surface area measured by the BET method of 20 m.sup.2/g or more; and a method of treating a sulfide solid electrolyte including the sulfide solid electrolyte being subjected to at least one mechanical treatment selected from disintegration and granulation.

There is provided a solid electrolyte production method which can provide a solid electrolyte having a high ion conductivity at low cost with high productivity using a liquid-phase method. The method comprises drying a slurry by fluidized drying using media particles as a medium. The slurry includes a solid electrolyte comprising at least an alkali metal, sulfur atoms and phosphorus atoms as constituent atoms, or a precursor of the solid electrolyte, and a polar solvent.

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.

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.

A solid electrolyte composition includes: an inorganic solid electrolyte (A) having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table; a binder (B); and a dispersion medium (C), in which the binder (B) includes a first binder (B1) that precipitates by a centrifugal separation process and a second binder (B2) that does not precipitate by the centrifugal separation process, the centrifugal separation process being performed in the dispersion medium (C) at a temperature of 25° C. at a centrifugal force of 610000 G for 1 hour, and a content X of the first binder (B1) and a content Y of the second binder (B2) satisfy the following expression,
0.01≤Y/(X+Y)<0.10.