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 a1, maximum thickness b1, minimum thickness cl in thickness distribution in the first direction, and thickness d1 (largest absolute value of difference from a1) satisfy 0.990≤(d1/a1)≤1.010 and (b1−c1)≤5.0 μm, and average thickness a2, maximum thickness b2, minimum thickness c2 in thickness distribution in the second direction, and thickness d2 (largest absolute value of difference from a2) satisfy 0.990≤(d2/a2)≤1.010 and (b2−c2)≤5.0 μm.