Nonaqueous electrolyte secondary battery

摘要

The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group (2) including a positive electrode (12), a negative electrode (13) including a material for absorbing-desorbing lithium ions, and a separator (3) arranged between the positive electrode (12) and the negative electrode (13), a nonaqueous electrolyte impregnated in the electrode group (2) and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket (1) for housing the electrode group (2) and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent gamma -butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent. <IMAGE> <IMAGE>