NOVELTY - An electrode (100) has active material layer (103) containing active material (101) and fluorine-containing binder (102), and current collector (104). In pyrolysis mass spectrometry at temperature of (T1-T2)/2 degrees C, a signal exists at mass numbers 81, 100, 132 and 200. The mass spectrum signal area (X) of (T1-100 degrees C) to less than T1 degrees C is less than or equal to mass spectrum signal area (Y) of T1-T2 degrees C. The mass spectrum signal area is signal area from T1-T2 at mass number which provides maximum area among signals of mass numbers 81, 100, 132 and 200 in mass spectrum of binder.    USE - Electrode e.g. positive electrode is used for nonaqueous electrolyte rechargeable battery for battery pack (all claimed) for personal computer, smart phone and electric vehicle.    ADVANTAGE - The electrode provides nonaqueous electrolyte rechargeable battery with high capacity and charging/discharging characteristics.    DETAILED DESCRIPTION - An electrode has active material layer containing active material and fluorine-containing binder, and current collector which is bound to the active material layer. In pyrolysis mass spectrometry at pyrolysis temperature of (T1-T2)/2 degrees C (where T1 degrees C is temperature at which pyrolysis of the binder starts, and T2 degrees C is temperature at which pyrolysis ends), a signal exists at any of mass numbers 81, 100, 132 and 200. The mass spectrum signal area (X) in a range of (T1-100 degrees C) to less than T1 degrees C is less than or equal to the mass spectrum signal area (Y) in a range of T1-T2 degrees C. When the binder is analyzed by thermogravimetry, the temperature at which pyrolysis of the binder starts is the temperature at which, in the main weight loss process, the weight loss during the weight loss process is 5%. When the binder is analyzed by thermogravimetry, the temperature at which pyrolysis of the binder ends is the temperature at which, in the main weight loss process, the weight loss during the weight loss process is 95%. The mass spectrum signal area is the signal area from T1-T2 at the mass number which provides the maximum area among signals of mass numbers 81, 100, 132 and 200 in the mass spectrum of the binder. INDEPENDENT CLAIMS are included for the following:    (1) nonaqueous electrolyte secondary battery; and    (2) battery pack.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of positive electrode active material.    Electrode (100)    Active material (101)    Binder (102)    Active material layer (103)    Collector (104)