Non-aqueous electrolyte secondary battery including a heat resistance layer

Abstract

Provided is a non-aqueous electrolyte secondary battery that can be produced while mixing at an interface between a positive electrode active material layer and a heat resistant layer is restricted even if a positive electrode slurry and a heat resistant layer slurry are simultaneously applied. The non-aqueous electrolyte secondary battery disclosed here includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode current collector, a positive electrode active material layer formed on the positive electrode current collector, and a heat resistant layer which is formed on the positive electrode current collector and is adjacent to the positive electrode active material layer. The positive electrode active material layer contains a positive electrode active material. The positive electrode active material is porous particles in which primary particles are aggregated. The positive electrode active material has a dibutyl phthalate oil absorption of 26.5 mL/100 g or more and 45.0 mL/100 g or less. The heat resistant layer contains an inorganic filler. A ratio of a tap density of the positive electrode active material to a tap density of the inorganic filler is 1.32 or more and 2.44 or less.