NOVELTY - A secondary battery comprises electrode component containing positive electrode and negative electrode, battery case in which the electrode component is accommodated, external terminal provided in the battery case, and nonaqueous electrolyte containing gas-forming agent accommodated in the battery case. The positive electrode is equipped with positive electrode electrical power collector (221) and positive electrode active material layer (223) containing positive electrode active material (610) formed on the positive electrode electrical power collector.    USE - Secondary battery e.g. lithium-ion secondary battery and nickel-hydrogen battery is used as power supply of motor vehicle, personal computer and portable terminal.    ADVANTAGE - The secondary battery has excellent charge/discharge characteristics.    DETAILED DESCRIPTION - A secondary battery comprises electrode component containing positive electrode and negative electrode, battery case in which the electrode component is accommodated, external terminal provided in the battery case and connected to the electrode component, and nonaqueous electrolyte containing gas-forming agent accommodated in the battery case and reacts with the voltage more than predetermined voltage, to generate gas. When the internal pressure of the battery case is more than the predetermined pressure, then the electric current interruption mechanism which interrupts the electrical connection of the electrode component and the external terminal is provided. The positive electrode is equipped with positive electrode electrical power collector and positive electrode active material layer containing at least positive electrode active material formed on the positive electrode electrical power collector. The positive electrode active material layer contains graphitized carbon black (620) as an electroconductive material. The face distance in plane (002) of graphitized carbon black in the positive electrode active material layer is 0.34 nm or less. An INDEPENDENT CLAIM is included for manufacture of secondary battery, which involves mixing graphitized carbon black and positive electrode active material in solvent, obtaining composition for forming positive electrode active material layer, coating the obtained composition for forming positive electrode active material layer on the positive electrode electrical power collector, drying, rolling the resultant positive electrode active material layer, producing electrode component using the positive electrode active material layer, and accommodating the electrode component and nonaqueous electrolyte in the battery case.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of structure of positive electrode sheet.    Positive electrode electrical power collector (221)    Positive electrode active material layer (223)    Positive electrode active material (610)    Graphitized carbon black (620)    Binder (630)