NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery suitable for applications to EV and HEV.SOLUTION: A nonaqueous electrolyte secondary battery comprises: a multilayered electrode assembly 15 including a plurality of layers each arranged by putting a positive electrode plate 1 and a negative electrode plate 2 together with a separator 3 interposed therebetween, provided that the positive electrode plate 1 includes a positive electrode active material expressed by LiNiCoMnOand having a layered structure, and the negative electrode plate 2 includes a negative electrode active material including graphite; a nonaqueous electrolyte including a mix solvent including EC, EMC and DMC with LiPFdissolved therein by 1.5 mol/liter; and an aluminum laminate outer sheath 6 housing the multilayered electrode assembly 15, and having the electrolyte filled thereinside. The contents of the EC, EMC and DMC to the total amount of the mix solvent are 36 vol.%, 31 vol.% and 33 vol.% respectively. The nonaqueous electrolyte has LiPFOadded thereto.