Conductive coating compositions and methods of preparation and application thereof are provided, whereby a mixture of conductive polymer encapsulated particles and non-encapsulated particles are employed to provide a conductive surface coating with controllable viscosity and conductivity. The particles may be filler and/or pigment particles such as calcium carbonate or clay, a portion of which are coated with a conductive polymer such as polypyrrole. Encapsulated particles are prepared and filtered, mixed with non-encapsulated particles, and subsequently combined with a binder for application to a surface or substrate such as paper. A dispersant may be included to obtain a suitable viscosity of the mixture prior to application. The relative concentrations of the encapsulated and non-encapsulated particles may be selected to tailor the resulting conductivity of the coating.

A novel sulfide solid electrolyte containing Li, P, S, and a halogen, which can be used as a solid electrolyte for a lithium secondary battery or the like, and is able to suppress the generation of a hydrogen sulfide gas even when exposed to moisture in the atmosphere. The sulfide solid electrolyte comprises a crystal phase or a compound having an argyrodite-type structure and containing Li, P, S, and a halogen; and a compound composed of Li, Cl, and Br and having a peak at each position of 2=29.10.5 and 33.70.5 in an X-ray diffraction pattern.

Sulfide-type compound particles microparticulated, having an argyrodite-type crystal structure, and including lithium (Li), phosphorus (P), sulfur (S), and a halogen (Ha). As sulfide-type compound particles that can inhibit generation of hydrogen sulfide gas even upon contact with moisture in the atmosphere, provided are sulfide-type compound particles having D50 in a volume-basis particle size distribution of 50 m or less and having an occupancy of sulfur (S) and the halogen (Ha) in the S3 (4a) site, as calculated by a neutron diffraction measurement, of 85% or more.

The problem of the present invention is to provide a sulfide solid electrolyte material with favorable reduction resistance. The present invention solves the problem by providing a sulfide solid electrolyte material having a peak at a position of 2=30.261.00 in X-ray diffraction measurement using a CuK ray, and having a composition of Li.sub.(4x4y)Si.sub.(1x+y)P.sub.(x)S.sub.(42az)O.sub.(2a+z) (a=1x+y, 0.65x0.75, 0.025y0.1, 0.2z0).

The problem of the present invention is to provide a sulfide solid electrolyte material with favorable reduction resistance. The present invention solves the problem by providing a sulfide solid electrolyte material having a peak at a position of 2=30.261.00 in X-ray diffraction measurement using a CuK ray, and having a composition of Li.sub.(4x4y)Si.sub.(1x+y)P.sub.(x)S.sub.(42az)O.sub.(2a+z) (a=1x+y, 0.65x0.75, 0.025y0.1, 0.2z0).

Provided are a method of manufacturing a solid electrolyte sheet including: a step of performing preforming on inorganic solid electrolyte particles containing solid particles plastically deformable at 250 C. or lower; and a step of performing shearing processing on one surface of the obtained preformed body, in which a solid electrolyte layer consisting of the inorganic solid electrolyte particles is formed, and a method of manufacturing a negative electrode sheet for an all-solid state secondary battery and an all-solid state secondary battery, which include the method of manufacturing a solid electrolyte sheet.

A sulfide-based solid electrolyte particle having a crystal phase of a cubic argyrodite-type crystal structure composed of Li, P, S and a halogen (Ha. The proposed sulfide-based solid electrolyte particle has a feature such that the ratio (Z.sub.Ha2/Z.sub.Ha1) of an element ratio Z.sub.Ha2 of the halogen (Ha) at the position of 5 nm in depth from the particle surface to an element ratio Z.sub.Ha1 of the halogen (Ha) at the position of 100 nm in depth from the particle surface is 0.5 or lower, as measured by XPS; and the ratio (Z.sub.O2/Z.sub.A2) of an element ratio Z.sub.O2 of oxygen to the total Z.sub.A2 of element ratios of phosphorus (P), sulfur (S), oxygen (O) and the halogen (Ha) at the position of 5 nm in depth from the particle surface is 0.5 or higher, as measured by XPS.

A method to manufacture a film made of vanadium disulphide by chemical vapor deposition on a previously heated substrate, includes successive procedures implemented in a vacuum reactor: injection of at least one organometallic molecule of vanadium, where the vanadium has a valence of less than or equal to 4; drainage of the reactor; injection of at least one sulphur molecule including at least one free thiol group, or forming a reaction intermediate comprising at least one free thiol group; injection of a reducing gas.

Provided are a method of manufacturing a solid electrolyte sheet including: heating a preformed body that is obtained by performing pre-pressure-forming on inorganic solid electrolyte particles containing solid particles plastically deformable at 250 C. or lower at a specific temperature or on inorganic solid electrolyte particles containing solid particles that have a thermal decomposition temperature of 250 C. or lower and that are plastically deformable at 250 C. or lower at a specific temperature and then performing pre-pressure-forming at a specific temperature to form a solid electrolyte layer consisting of inorganic solid electrolyte particles, a method of manufacturing a negative electrode sheet for an all-solid state secondary battery, and a method of manufacturing an all-solid state secondary battery, which include the method of manufacturing a solid electrolyte sheet.

A method for producing a sulfide solid electrolyte having an argyrodite-type crystal structure may involve: mixing a raw material containing elemental phosphorus at an integrated power of 0.5 kWh/kg or more, and heat-treating a precursor obtained in the mixing at 350 to 500 C.