POSITIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, BATTERY MODULE AND BATTERY SYSTEM USING THE SAME

A positive electrode () for non-aqueous electrolyte secondary batteries, including collector () and active material layer (), wherein: integrated value (a) is 3 to 15% (for frequency of diameters of 1 μm or less), and frequency (b) is 8 to 20% (for diameter with a maximum frequency). A positive electrode () for non-aqueous electrolyte secondary batteries, including collector () and active material layer (), wherein assuming two directions perpendicular to thickness direction of collector () and mutually orthogonal as first and second directions, average thickness a, maximum thickness b, minimum thickness c in thickness distribution in the first direction, and thickness d (largest absolute value of difference from a) satisfy 0.990≤(d/a)≤1.010 and (b−c)≤5.0 μm, and average thickness a, maximum thickness b, minimum thickness c in thickness distribution in the second direction, and thickness d (largest absolute value of difference from a) satisfy 0.990≤(d/a)≤1.010 and (b−c)≤5.0 μm.