PRISMATIC NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

This prismatic non-aqueous electrolyte secondary battery is provided with a negative electrode and a nonaqueous electrolyte. The negative electrode is provided with a negative electrode current collector and a negative electrode mixture layer formed on the negative electrode current collector. The negative electrode mixture layer comprises a first layer containing a first carbon active material, a Si active material and a polyacrylic acid or a salt thereof, and a second layer containing a second carbon active material. The nonaqueous solvent configuring the nonaqueous electrolyte contains a cyclic carbonate. The total content of the cyclic carbonate is 20-30 vol% of the total volume of the nonaqueous solvent, and the content of the ethylene carbonate belonging to the cyclic carbonate is less than or equal to 10 vol% of the total volume of the nonaqueous solvent. The nonaqueous electrolyte contains vinylene carbonate. With this configuration, it is possible to provide a prismatic nonaqueous electrolyte secondary battery in which swelling of the battery accompanying charge/discharge cycles is suppressed.