Abstract: Disclosed is a flat lithium primary battery including a case, a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte, in which the positive electrode, the negative electrode, the separator, and the nonaqueous electrolyte are disposed in the case. The positive electrode includes: a positive electrode active material; and a fluorocarbon resin with swellability in the nonaqueous electrolyte. In the positive electrode, the fluorocarbon resin is present in particulate form. When, on the flat lithium primary battery having been put in an environment with a temperature of 25° C., a high temperature storage test to store the flat lithium primary battery in an environment with a temperature of 125° C. for 100 hours is conducted, the ratio d2/d1 of a particle diameter d2 of the fluorocarbon resin after the high temperature storage test to a particle diameter d1 of the fluorocarbon resin before the high temperature storage test is 1.5 or higher and 3.1 or lower.

Abstract: A lithium battery including a positive electrode, a negative electrode containing lithium, and a non-aqueous electrolyte having lithium ion conductivity. The positive electrode includes at least one of a manganese oxide and a fluorinated graphite. A powdery or fibrous carbon material adheres to at least part of a surface of the negative electrode, the surface facing the positive electrode. The non-aqueous electrolyte includes a non-aqueous solvent, a solute, and an additive. The solute includes LiClO4, and the additive is LiBF4. The ratio of LiBF4 is, for example, 1 to 100 parts by mass, relative to 100 parts by mass of the solute.

Abstract: Disclosed is a flat-shaped battery including: a power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte; a cylindrical case formed of a conductor, housing the power generation element, and having a circular bottom and a circular opening; a sealing plate formed of a conductor and closing the opening; an insulating member interposed between the case and the sealing plate; and a plate-shaped current collector disposed between the case and the positive electrode. The current collector is welded to the case and is in contact with the positive electrode. A welding point where the current collector is welded to the bottom is set so as to allow contact between the positive electrode and a center portion of the current collector to be maintained when the case is deformed such that a center portion of the bottom is displaced outward of the case.

Abstract: A lithium battery including a positive electrode, a negative electrode containing lithium, and a non-aqueous electrolyte having lithium ion conductivity. The positive electrode includes at least one of a manganese oxide and a fluorinated graphite. A powdery or fibrous carbon material adheres to at least part of a surface of the negative electrode, the surface facing the positive electrode. The non-aqueous electrolyte includes a non-aqueous solvent, a solute, and an additive. The solute includes LiclO4, and the additive is LiBF4. The ratio of LiBF4 is, for example, 1 to 100 parts by mass, relative to 100 parts by mass of the solute.

Abstract: Disclosed is a flat-shaped battery including: a power generation element including a positive electrode, a negative electrode, a separator, and an electrolyte; a cylindrical case formed of a conductor, housing the power generation element, and having a circular bottom and a circular opening; a sealing plate formed of a conductor and closing the opening; an insulating member interposed between the case and the sealing plate; and a plate-shaped current collector disposed between the case and the positive electrode. The current collector is welded to the case and is in contact with the positive electrode. A welding point where the current collector is welded to the bottom is set so as to allow contact between the positive electrode and a center portion of the current collector to be maintained when the case is deformed such that a center portion of the bottom is displaced outward of the case.

Abstract: Disclosed is a coin battery including: a cylindrical battery can having a bottom portion, and a first side wall rising from the periphery of the bottom portion; a sealing plate having a top portion, and a second side wall extending from the periphery of the top portion along the inner side of the first side wall; a gasket interposed and compressed between the first side wall and the second side wall; and a power generation element sealed with the battery can and the sealing plate. In order to improve the battery capacity while ensuring leakage resistance, the second side wall is provided with a bulging portion bulging outward, and a part of the power generation element is disposed inside the bulging portion. The negative electrode is preferably in contact with the inner side of the bulging portion.