Abstract: Provided is a secondary lithium battery including: a positive electrode plate that is a sintered lithium complex oxide plate; a negative electrode containing carbon and styrene butadiene rubber (SBR); and an electrolytic solution containing lithium borofluoride (LiBF4) in a non-aqueous solvent composed of ?-butyrolactone (GBL), or composed of ethylene carbonate (EC) and ?-butyrolactone (GBL).

Abstract: Provided is a lithium secondary battery including: a positive electrode plate being a lithium complex oxide sintered plate; a negative electrode layer; a separator; a positive electrode current collector foil; a negative electrode current collector foil; an electrolytic solution; a pair of exterior films having outer peripheral edges sealed with each other to form an internal space that accommodates the battery elements; a positive electrode tab terminal; and a negative electrode tab terminal, wherein the inner peripheral edge of the sealed part of the exterior films and the outer peripheral edge of the positive electrode plate are apart from each other at a distance Wp of 2.0 to 4.0 mm on the side on which the positive electrode tab terminal is sealed, and the electrolytic solution has a volume of 1.05 to 1.25 times the total void volume of the positive electrode plate, the separator, and the negative electrode layer.

Abstract: A thin lithium secondary cell includes a positive electrode, a separator, a negative electrode, an electrolytic solution, and a cell case. The separator is arranged on the positive electrode in a predetermined direction of superposition. The separator includes a resin layer. The negative electrode is arranged on the separator on the side opposite to the positive electrode in the direction of superposition. The positive electrode, the negative electrode, and the separator are impregnated with the electrolytic solution. The cell case has a sheet-like shape and covers the positive electrode and the negative electrode from both sides in the direction of superposition. The cell case houses therein the positive electrode, the separator, the negative electrode, and the electrolytic solution. The separator has air permeability higher than or equal to 20 sec/100 cc and lower than or equal to 80 sec/100 cc.

Abstract: Provided is a lithium secondary battery including: a positive electrode plate being a lithium complex oxide sintered plate; a negative electrode layer; a separator; a positive electrode current collector foil; a negative electrode current collector foil; an electrolytic solution; a pair of exterior films having outer peripheral edges sealed with each other to form an internal space that accommodates the battery elements; a positive electrode tab terminal; and a negative electrode tab terminal, wherein the inner peripheral edge of the sealed part of the exterior films and the outer peripheral edge of the positive electrode plate are apart from each other at a distance Wp of 2.0 to 4.0 mm on the side on which the positive electrode tab terminal is sealed, and the electrolytic solution has a volume of 1.05 to 1.25 times the total void volume of the positive electrode plate, the separator, and the negative electrode layer.

Abstract: Provided is a secondary lithium battery including: a positive electrode plate that is a sintered lithium complex oxide plate; a negative electrode containing carbon and styrene butadiene rubber (SBR); and an electrolytic solution containing lithium borofluoride (LiBF4) in a non-aqueous solvent composed of ?-butyrolactone (GBL), or composed of ethylene carbonate (EC) and ?-butyrolactone (GBL).

Abstract: A cathode active material for a lithium secondary battery, includes secondary particles, each being formed of a large number of primary particles whose mean particle size is equal to or larger than 0.01 ?m and equal to or smaller than 5 ?m, and includes the following features. An oriented ratio of a (003) plane is equal to or larger than 60%. A mean particle size is equal to or larger than 1 ?m and equal to or smaller than 100 ?m. An aspect ratio is equal to or larger than 1.0 and is smaller than 2. A voidage is equal to or larger than 3% and equal to or smaller than 30%. A ratio of opened pore is equal to or larger than 70%. A mean pore size of the opened pore is equal to or larger than 0.1 ?m and equal to or smaller than 5 ?m.