Abstract: A positive electrode material comprises a positive electrode active material containing lithium nickel cobalt manganese oxide having an ?-NaFeO2 structure and a solid electrolyte material. The solid electrolyte material contains Li, Ti, M1, and F, and M1 is at least one selected from the group consisting of Ca, Mg, Al, Y, and Zr.

Abstract: The solid electrolyte material contains a halide solid electrolyte. The halide solid electrolyte contains Li, at least one element selected from the group consisting of metalloids and metal elements other than Li, and at least one element selected from the group consisting of F, Cl, Br, and I. The halide solid electrolyte has a crystallite size greater than or equal to 40 nm.

Abstract: A positive electrode active material contains a composite sulfide containing Mg and at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Ni, Cu, Zr, Nb, Mo, Ta, and W. The positive electrode active material has a crystal structure belonging to space group Fm-3m.

Abstract: A non-aqueous electrolyte solution for a magnesium secondary battery includes a non-aqueous solvent, a magnesium salt, and an organoaluminum ate complex salt represented by formula (1) below. In formula (1), R1, R2, R3, and R4 are each independently (i) an alkyl group or (ii) an alkyl group with a functional group.

Abstract: A nonaqueous electrolyte solution for a magnesium secondary battery contains a nonaqueous solvent; a magnesium salt; and an organoboronate complex salt represented by formula (1) below: where R1, R2, R3, and R4 each independently contain a fluoroalkyl group.

Abstract: The non-aqueous electrolyte liquid for a magnesium secondary battery according to one aspect of the present disclosure contains a non-aqueous solvent, a magnesium salt, and an aromatic heterocyclic compound which has an aliphatic hydrocarbon group which is a substituent. The aromatic heterocyclic compound includes at least one selected from the group consisting of a nitrogen atom, an oxygen atom, a phosphorus atom, and a sulfur atom as a constituent atom of the ring thereof. The aromatic heterocyclic compound is a non-electrolyte.

Abstract: A nonaqueous electrolyte liquid for an alkaline earth metal secondary battery includes: a nonaqueous solvent: an alkaline earth metal cation; an organic molecule coordinated to the alkaline earth metal cation; and an anion. The organic molecule is a carbonic acid ester, a carboxylic acid ester, a phosphoric acid ester, or a sulfonic acid ester.

Abstract: A nonaqueous electrolyte includes a nonaqueous solvent and an alkali metal salt dissolved in the nonaqueous solvent. The nonaqueous solvent contains a polar organic solvent, a perfluoropolyether, and a diester compound represented by a formula R1—O—C(?O)—[—(CF2)—]a—C(?O)—O—R2, where a is an integer of 1 to 4, and each of R1 and R2 represents one selected from the group consisting of an alkyl group having a carbon number of 1 to 4 and a hydrocarbon group which has a carbon number of 1 to 4 and in which at least one hydrogen atom is substituted with fluorine.