Abstract: A method for forming a positive electrode active material applicable to a lithium-ion battery having excellent charge and discharge characteristics even in a low-temperature environment is provided. The method for forming a positive electrode active material includes: a first step of heating lithium cobalt oxide with a median diameter of less than or equal to 10 ?m; a second step of mixing a fluorine source and a magnesium source with the lithium cobalt oxide subjected to the first step, thereby forming a first mixture; a third step of heating the first mixture; a fourth step of mixing a nickel source and an aluminum source with the first mixture subjected to the third step, thereby forming a second mixture; and a fifth step of heating the second mixture. The third step and the fifth step are performed in a state where the first mixture is held to have a thickness of less than or equal to 2.0 mm in a first setter.

Abstract: An image forming device of the present invention includes a first carriage path (15) for carrying a paper stored in a paper feeding tray (11) to the printer (2), and the second carriage path (16) for carrying a paper stored in a paper feeding tray (12) to the printer (2), and the first carriage path (15) and the second carriage path (16) individually carry a paper to the printer (2).