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.

A solid electrolyte represented by general formula Li.sub.ySiR.sub.x(MO.sub.4), where x is an integer from 1 to 3 inclusive, y=4−x, each R present is independently C1-C3 alkyl or C1-C3 alkoxy, and M is sulfur, selenium, or tellurium. Methods of making the solid electrolyte include combining a phenylsilane and a first acid to yield mixture including benzene and a second acid, and combining at least one of an alkali halide, and alkali amide, and an alkali alkoxide with the second acid to yield a product d represented by general formula Li.sub.ySiR.sub.x(MO.sub.4).sub.y. The second acid may be in the form of a liquid or a solid. The phenylsilane includes at least one C1-C3 alkyl substituent or at least one C1-C3 alkoxy substituent, and the first acid includes at least one of sulfuric acid, selenic acid, and telluric acid.

A cathode includes: a mixed conductive layer, wherein the mixed conductive layer includes a core-shell structured particle having a core portion including a solid electrolyte and a shell portion including an electronic conductor, wherein the cathode is configured to use oxygen as a cathode active material.

A positive electrode material of the present disclosure includes: a positive electrode active material; and a first solid electrolyte material coating at least partially a surface of the positive electrode active material, wherein the first solid electrolyte material includes Li, Ti, M1, and F, and the M1 is at least one element selected from the group consisting of Ca, Mg, Al, Y, and Zr.

Disclosed is a method of producing an antioxidant that has excellent antioxidant ability and is well dispersed when applied to a membrane-electrode assembly (MEA). The method includes a step of preparing a powder including reduced metal oxide and a step of mixing the powder with a powdery ionomer to obtain an antioxidant in which the ionomer is bound to the surface of the reduced metal oxide.

A polymer electrolyte membrane includes an ion-conducting polymeric electrolyte material and platelets, distributed through the polymeric electrolyte material. The platelets have an aspect ratio of length to thickness of at least 2:1. The platelets are aligned generally parallel to a length of the membrane. The platelets can be functionalized with free radical scavengers, or other moieties, to extend the lifetime of the membrane or of a membrane electrode assembly incorporating the membrane.

A polymer electrolyte membrane according to the present invention has a cluster diameter of 2.96 to 4.00 nm and a converted puncture strength of 300 gf/50 μm or more. The polymer electrolyte membrane according to the present invention has a low electric resistance and an excellent mechanical strength.

A lithium-ion conducting composite material includes a Li binary salt, a Li-ion conductor with a chemical composition of Li.sub.2−3x+y−zFe.sub.xO.sub.y(OH).sub.1−yCl.sub.1−z, and at least two of: a first inorganic compound with a chemical composition of (Fe.sub.1−xM1.sub.x)O.sub.1−y(OH).sub.yCl.sub.1−x; a second inorganic compound with a chemical composition of M2OX; and a defected doped inorganic compound with a chemical composition of (M3OX)′. The value of n is 1 or 2, x is greater than 0 and less than or equal to 0.25, and y is greater than or equal to 0 and less than or equal to 0.25. Also, M1 is at least one of Mg and Ca, M2 and M3 are each at least one of Fe, Al, Sc, La, and Y, and X is at least one of F, Cl, Br, and I.

The invention pertains to a process for the manufacture of a fluoropolymer film, to the fluoropolymer film obtainable therefrom and to use of said fluoropolymer film in electrochemical and photo-electrochemical devices.

A composite electrolyte including a lithium salt; a solid electrolyte wherein the solid electrolyte is a sulfide solid electrolyte, an oxide solid electrolyte, or a combination thereof; and an ionic liquid, wherein a mixture of the ionic liquid and the lithium salt has a dielectric constant of from about 4 to about 12, and an amount of halogen ions eluted from the composite electrolyte after immersion of the solid electrolyte in the ionic liquid for 24 hours is less than about 25 parts per million by weight, based on the total weight of the composite electrolyte, as measured by ion chromatography.