Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery comprising:

• a nonaqueous electrolyte secondary battery separator including a polyolefin porous film;
• a porous layer containing a polyvinylidene fluoride-based resin;
• a positive electrode plate having a capacitance of not less than 2 nF and not more than 1000 nF per measurement area of 900 mm2;
• and
• a negative electrode plate having a capacitance of not less than 4 nF and not more than 8500 nF per measurement area of 900 mm2, wherein:
• diethyl carbonate dropped on the polyolefin porous film diminishes at a rate of 15 sec/mg to 21 sec/mg;
• the diethyl carbonate has a spot diameter of not less than 20 mm 10 seconds after the diethyl carbonate was dropped on the polyolefin porous film;
• the porous layer is provided between the nonaqueous electrolyte secondary battery separator and at least one of the positive electrode plate and the negative electrode plate;
• and
• the polyvinylidene fluoride-based resin contained in the porous layer contains an α-form polyvinylidene fluoride-based resin in an amount of not less than 35.0 mol % with respect to 100 mol % of a total amount of the α-form polyvinylidene fluoride-based resin and a β-form polyvinylidene fluoride-based resin contained in the polyvinylidene fluoride-based resin,
• where the amount of the α-form polyvinylidene fluoride-based resin contained is calculated from waveform separation of (α/2) observed at around −78 ppm in a 19F-NMR spectrum obtained from the porous layer, and waveform separation of {(α/2)+β} observed at around −95 ppm in the 19F-MMR spectrum obtained from the porous layer.