Nonaqueous electrolyte secondary battery

Abstract

Provided is a nonaqueous electrolyte secondary battery having excellent input characteristics and excellent high-temperature storage characteristics. A nonaqueous electrolyte secondary battery disclosed here includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode includes a negative electrode active material layer containing a negative electrode active material. The negative electrode active material includes carbon material particles having an average circularity of 0.86 or more. The negative electrode active material layer has an apparent density of 1.30 g/cm3 to 1.69 g/cm3. The nonaqueous electrolyte contains a nonaqueous solvent and an electrolyte salt. The nonaqueous solvent contains 1% by volume to 30% by volume of a carboxylate ester having 4 or less carbon atoms.

Dependencies are inferred from the claim text.