Abstract: A positive electrode active material for a secondary battery contains a lithium metal composite oxide having a crystal structure based on a rock salt structure belonging to the space group Fm-3m. The lithium metal composite oxide contains at least one element A1 selected from the group consisting of Fe, Ca, Cr, Na, Al, Si, Mg, Cu, Zn, Pb, Sb, and W. The content of the element A1 in the lithium metal composite oxide is 10 ppm by mass or more and 1000 ppm by mass or less with respect to the total amount of the lithium metal composite oxide. A lattice constant a, which indicates a length in an a-axis direction of a crystal lattice of the lithium metal composite oxide is 4.09 ? or more and 4.16 ? or less.

Abstract: A positive electrode active material for a secondary battery contains a lithium metal composite oxide having a crystal structure based on a rock salt structure belonging to the space group Fm-3m. The lithium metal composite oxide contains at least one element A1 selected from the group consisting of Fe, Cr, Na, Mg, Cu, Zn, Pb, Sb, and W. The content of the element A1 in the lithium metal composite oxide is 10 ppm by mass or more and 1000 ppm by mass or less with respect to the total amount of the lithium metal composite oxide.

Abstract: Provided is a film thermoforming device of a blister packaging machine in which molding can be carried out without extreme reduction in a sheet thickness of a top surface portion of a pocket, and without warpage, which allows stacking, and stable molding can be performed at a high rate. This film thermoforming device comprises a compressed air blowing mechanism that is disposed at a forming mold 5A and that has a compressed air blowing pore 53a which is open at an inner bottom portion of a pocket hole 52 of the forming mold 5A, and a compressed air blowing pore 53b which is open around the pocket hole 52 of the forming mold 5A.