NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

The purpose of the present disclosure is to provide a nonaqueous electrolyte secondary battery capable of suppressing the amount of battery swelling caused by gas generation during storage under a high-temperature condition. A nonaqueous electrolyte secondary battery that is an aspect of the present disclosure comprises a positive electrode, a negative electrode (12), and a nonaqueous electrolyte solution. The negative electrode (12) comprises a negative electrode current collector (40) and a negative electrode active material layer (42) disposed on the negative electrode current collector (40). The negative electrode active material layer (42) contains graphite particles A and graphite particles B as negative electrode active materials. The graphite particles A have an internal void ratio of 5% or less. The graphite particles B have an internal void ratio of 8-20%. When the negative electrode active material layer (42) is divided in half in the thickness direction, the region (42b) of the half to the side of the outer surface contains more graphite particles A than the region (42a) of the half to the side of the negative electrode current collector. The nonaqueous electrolyte solution contains a diisocyanate compound.