NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

Provided is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes positive active material particles having a layered rock salt type crystal structure. A filling ratio of the positive active material particles in the positive electrode is 85% or more. The positive active material particles include broken particles in which a longest diameter is within a range from 15 μm to 30 μm. A crack with a length ⅕ times or more and ⅓ times or less the longest diameter of the broken particles is present. The crack has an intersection, and an abundance ratio x of broken particle is 20% or less.