| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery, of improved in large current discharging characteristics and charging/discharging cycle characteristics, with deformation of the exterior jacketing material, when stored at high temperature suppressed. SOLUTION: In the nonaqueous electrolyte secondary battery provided with an electrode group and a nonaqueous electrolyte, (1) the electrode group is accommodated in the sheet-made exterior jacketing material of 0.5 mm or less in thickness including a resin layer, (2) an nonaqueous solvent of the nonaqueous electrolyte contains γ-butyrolactone, ethylene carbonate, at least one kind of vinylene carbonate compound, and at least one kind of vinyl ethylene carbonate compound, (3) the vinylene carbonate compound, the vinyl ethylene carbonate compound, and the total amount of these compounds is 0.01-5 wt.%, 0.01-5 wt.%, and 0.02-6 wt.%, respectively, based on the total weight of the nonaqueous solvent, and (4) the γ-butyrolactone and the ethylene carbonate are >=50 vol.% and >=10 vol.%, respectively, with respect to the total volume of the nonaqueous solvent. |
