NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

A non-aqueous electrolyte secondary battery includes a positive electrode including a positive electrode active material, a separator, a negative electrode facing the positive electrode with the separator interposed therebetween, and a non-aqueous liquid electrolyte, wherein the non-aqueous liquid electrolyte includes a non-aqueous solvent, and 6-alkylthio-1,3,5-triazine-2,4-dithiol; at least a portion of the 6-alkylthio-1,3,5-triazine-2,4-dithiol is dissolved in the non-aqueous solvent; and the alkylthio group at a 6th position preferably has an alkyl group with 1 to 8 carbon atoms.