Abstract: A positive-electrode active material contains a lithium composite oxide containing at least one selected from the group consisting of F, Cl, N, and S. The crystal structure of the lithium composite oxide belongs to a space group C2/m. An XRD pattern of the lithium composite oxide comprises a first peak within the first range of 44 degrees to 46 degrees of a diffraction angle 2? and a second peak within the second range of 18 degrees to 20 degrees of the diffraction angle 2?. The ratio of the second integrated intensity of the second peak to the first integrated intensity of the first peak is within a range of 0.05 to 0.90.

Abstract: A positive-electrode active material contains a lithium composite oxide, wherein the lithium composite oxide is a multiphase mixture including a first phase, of which a crystal structure belongs to a space group Fm-3m, and a second phase, of which a crystal structure belongs to a space group Fd-3m; and in an XRD pattern of the lithium composite oxide, the integrated intensity ratio I(18°-20°)/I(43°-46°) of a first maximum peak I(18°-20°) within a first range of 18 degrees to 20 degrees at a diffraction angle 2? to a second maximum peak I(43°-46°) within a second range of 43 degrees to 46 degrees at the diffraction angle 2? satisfies 0.05?I(18°-20°)/I(43°-46°)?0.90.

Abstract: A positive-electrode active material contains a lithium composite oxide containing at least one selected from the group consisting of fluorine, chlorine, nitrogen, sulfur, bromine, and iodine. The crystal structure of the lithium composite oxide belongs to the space group R-3m. The integrated intensity ratio I(003)/I(104) of a peak intensity I(003) on the (003) plane to a peak intensity I(104) on the (104) plane in an XRD pattern of the lithium composite oxide satisfies 0.62?I(003)/I(104)?0.90.

Abstract: A positive electrode active material includes a lithium composite oxide containing: at least one element selected from the group consisting of fluorine, chlorine, nitrogen, sulfur, bromine, and iodine; and a covering material that covers a surface of the lithium composite oxide. The lithium composite oxide has a crystal structure that belongs to a space group R-3m. The ratio |(003)/|(104) of a first integrated intensity ||(003) of a first peak corresponding to a (003) plane to a second integrated intensity ||(104) of a second peak corresponding to a (104) plane in an XRD pattern of the lithium composite oxide satisfies 0.62?|(003)/|(104)?0.90.

Abstract: A positive electrode active material includes a lithium composite oxide and a covering material that covers a surface of the lithium composite oxide. The covering material has an electron conductivity of 106 S/m or less. The lithium composite oxide is a multiphase mixture including a first phase having a first crystal structure that belongs to a space group Fm-3m and a second phase having a second crystal structure that belongs to a space group other than a space group Fm-3m. The ratio I(18°-20°)/I(43°-46°) of a first integrated intensity I(18°-20°) of a first maximum peak present at a first diffraction angle 2? of 18° or more and 20° or less to a second integrated intensity I(43°-46°) of a second maximum peak present at a second diffraction angle 2? of 43° or more and 46° or less in an XRD pattern of the lithium composite oxide satisfies 0.05?I(18°-20°)/I(43°-46°)?0.90.

Abstract: A positive-electrode active material contains a compound represented by the following composition formula (1): LixMeyO?X???(1) where Me denotes one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er, X denotes two or more elements selected from the group consisting of F, Cl, Br, I, N, and S, and x, y, ?, and ? satisfy 0.75?x?2.25, 0.75?y?1.50, 1??<3, and 0<??2, respectively. A crystal structure of the compound belongs to a space group Fm-3m.

Abstract: A positive electrode active material comprising: a compound which has a crystal structure belonging to space group Fm-3m and which is represented by the following composition formula: LixMeyO?X?. In the formula, the Me represents one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er. The X represents one element selected from the group consisting of Cl, Br, I, N, and S. The following conditions are satisfied: 0.5?x?1.5; 0.5?y?1.0; 1??<2; and 0<??1.

Abstract: A positive electrode active material for a battery, the positive electrode active material comprising a compound having a crystal structure of space group Fm-3m and represented by composition formula (1): LixMe1?Me2?O2 . . . (1). In the formula, Me1 represents one or more elements selected from the group consisting of Mn, Ni, Co, Fe, Al, Sn, Cu, Nb, Mo, Bi, Ti, V, Cr, Y, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, Ta, W, La, Ce, Pr, Sm, Eu, Dy, and Er, Me2 represents one or more elements selected from the group consisting of B, Si, and P, and the following conditions are met: 0<?; 0<?; ?+?=y; 0.5?x/y?3.0; and 1.5?x+y?2.3.

Abstract: A cathode active material contains a compound having a crystal structure of space group FM-3M, represented by composition formula (1), and having a half-width in 2? of 0.9° or more and 2.4° or less for a (200) diffraction peak in powder X-ray diffraction (XRD): LixMeyO2. . . (1). In the formula, Me represents one or two or more elements selected from the group consisting of Mn, Nb, Ti, Ni, Co, Fe, Sn, Cu, Mo, Bi, V, and Cr. In addition to this, the following conditions are met: 0.5?x/y?3.0; and 1.5?x+y?2.3.

Abstract: A cathode active material contains a compound having a crystal structure of space group FM-3M and represented by composition formula (1): LixMeyO2 . . . (1). In the formula, Me represents any of the following: Mn; Mn and one or two or more elements selected from the group consisting of Co, Fe, Sn, Cu, Mo, Bi, V, and Cr; Ni, Mn, and one or two or more elements selected from the group consisting of Co, Fe, Sn, Cu, Mo, Bi, V, and Cr; and one or two or more elements selected from the group consisting of Ni, Co, Fe, Sn, Cu, Mo, Bi, V, and Cr. In addition to this, the following conditions are met: 0.5?x/y?3.0; and 1.5?x+y?2.3.