Abstract: A composite positive electrode active material includes a positive electrode active material and a coating layer coating at least a portion of a surface of the positive electrode active material. The coating layer contains a first coating material and a second coating material. The first coating material is a fluoride solid electrolyte, and the second coating material is a material that reacts with at least one selected from the group consisting of water and hydrogen fluoride, to form at least one selected from the group consisting of lithium oxide and lithium fluoride.

Abstract: A coated positive electrode active material includes a positive electrode active material, a first coating layer, and a second coating layer. The first coating layer coats at least a portion of a surface of the positive electrode active material. The second coating layer coats at least a portion of a surface of a fundamental active material, which includes the first coating layer and the positive electrode active material. The first coating layer contains an oxide solid electrolyte. The second coating layer contains Li, Ti, M, and F, where M is at least one element selected from the group consisting of Ca, Mg, Al, Y, and Zr.

Abstract: Disclosed is a positive electrode material having inhibited increase in heat release when exposed to high temperature. The positive electrode material of the disclosure comprises a positive electrode active material, a first solid electrolyte and a second solid electrolyte, wherein the positive electrode active material comprises a lithium-containing oxide, the first solid electrolyte comprises Li and X as constituent elements and comprises no S, X is one or more elements selected from the group consisting of F, Cl, Br and I, the second solid electrolyte comprises Li and S as constituent elements, the first solid electrolyte covers at least part of the surface of the positive electrode active material, the second solid electrolyte contacts with the positive electrode active material across the first solid electrolyte, and the average covering thickness of the first solid electrolyte is 104 nm or greater.

Abstract: A covered positive electrode active material includes a particulate positive electrode active material and a solid electrolyte that covers a surface of the positive electrode active material. The solid electrolyte forms a covering layer. The covering layer is formed such that recessed portions of the surface of the positive electrode active material are filled with the solid electrolyte. Protruding portions of the surface of the positive electrode active material are exposed on a surface of the covered positive electrode active material. A degree of unevenness of a group of particles of the positive electrode active material is defined as ?1, a degree of unevenness of a group of particles of the covered positive electrode active material is defined as ?2, and a degree of change in unevenness R defined by formula (2) below is greater than or equal to 1.1.

Abstract: A coated positive electrode active material according to the present disclosure includes a positive electrode active material and a coating layer coating at least partially a surface of the positive electrode active material. The coating layer includes Li, Zr, and F. A material of the coating layer may be represented, for example, by composition formula (1) Li?Zr?F? . . . Formula (1). In the composition formula (1), the symbols ?, ?, and ? satisfy 0<?<8, 0<??1.1, and 0<??8. A positive electrode material of the present disclosure includes the coated positive electrode active material and a first solid electrolyte. A battery of the present disclosure includes a positive electrode including the positive electrode material, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode.

Abstract: A positive electrode material of the present disclosure includes a positive electrode active material, a first solid electrolyte including a sulfide solid electrolyte, and a second solid electrolyte including a halide solid electrolyte. A proportion x of a volume of the second solid electrolyte to a sum of a volume of the first solid electrolyte and the volume of the second solid electrolyte satisfies 20?x?95 in percentage. The proportion x satisfies, for example, 35.2?x?76.5 in percentage.

Abstract: A secondary battery includes: a first electrode; a second electrode; a first solid electrolyte covering the first electrode, the first solid electrolyte containing an alkaline earth metal; and a liquid electrolyte filling the space between the first electrode and the second electrode, the liquid electrolyte containing a non-aqueous solvent and a salt of the alkaline earth metal dissolved in the non-aqueous solvent.

Abstract: A solid electrolyte includes a matrix including, as a salt, containing a metal halide containing an alkaline-earth metal and a metal, and at least one filler located in the matrix.

Abstract: A positive electrode material includes a positive electrode active material, a cover layer that covers at least part of a surface of the positive electrode active material and that contains a first solid electrolyte material, and a second solid electrolyte material that is a material different from the first solid electrolyte material. The first solid electrolyte material contains Li, M, and X and does not contain sulfur. M represents at least one element selected from the group consisting of metal elements other than Li and semi-metal elements, and X represents halogen elements including Cl.

Abstract: A solid electrolyte has a composition represented by the formula: MgxMySiOz, where M represents at least one selected from the group consisting of Ti, Zr, Hf, Ca, Sr, and Ba; x satisfies 0<x<2; y satisfies 0<y<2; and z satisfies 3<z<6.

Abstract: A solid electrolyte consists essentially of Li, M, and X. M includes at least one element selected from the group consisting of Gd, Tb, and Sm. X is at least one element selected from the group consisting of Cl, Br, and I.

Abstract: A solid electrolyte contains a composite metal halide. The composite metal halide contains magnesium, gallium, indium, and a halogen. In the composite metal halide, the molar ratio of indium to the total of gallium and indium is less than 0.2.

Abstract: A solid electrolyte contains a composite metal halide. The composite metal halide contains magnesium, an alkaline-earth metal having a larger ionic radius than magnesium, gallium, and a halogen. In the composite metal halide, the molar ratio of the alkaline-earth metal to the total of magnesium and the alkaline-earth metal is less than 0.2.

Abstract: A solid electrolyte includes: a matrix containing, as a solid salt, at least one selected from the group consisting of (i) a metal halide containing an alkaline-earth metal and (ii) a metal compound containing the alkaline-earth metal and fluorine; and one or more fillers embedded in the matrix.

Abstract: A solid electrolyte has a composition represented by the formula: MgxSiOyNz, where 1<x<2, 3<y<5, and 0?z<1. The solid electrolyte is an amorphous material.

Abstract: A solid electrolyte contains a composite metal halide. The composite metal halide contains magnesium, gallium, indium, and a halogen. In the composite metal halide, the molar ratio of indium to the total of gallium and indium is less than 0.2.

Abstract: A solid electrolyte contains a composite metal halide. The composite metal halide contains magnesium, an alkaline-earth metal having a larger ionic radius than magnesium, gallium, and a halogen. In the composite metal halide, the molar ratio of the alkaline-earth metal to the total of magnesium and the alkaline-earth metal is less than 0.2.

Abstract: A solid electrolyte includes a matrix including, as a salt, containing a metal halide containing an alkaline-earth metal and a group 13 metal, and at least one filler located in the matrix.

Abstract: A solid electrolyte includes: a matrix containing, as a solid salt, at least one selected from the group consisting of (i) a metal halide containing an alkaline-earth metal and (ii) a metal compound containing the alkaline-earth metal and fluorine; and one or more fillers embedded in the matrix.

Abstract: A secondary battery includes: a first electrode; a second electrode; a first solid electrolyte covering the first electrode, the first solid electrolyte containing an alkaline earth metal; and a liquid electrolyte filling the space between the first electrode and the second electrode, the liquid electrolyte containing a non-aqueous solvent and a salt of the alkaline earth metal dissolved in the non-aqueous solvent.