| 摘要 |
A nonaqueous electrolyte secondary battery has a positive electrode containing a lithium complex oxide, a negative electrode which adsorbs/desorbs lithium, and an electrolyte, and not less than 0.1% by mass and not more than 2% by mass of one or more kinds of compounds selected from LiFOB and LiBOB, or not less than 0.01% by mass and not more than 2% by mass of LiBF4, and not less than 0.1% by mass and not more than 4% by mass of a aromatic compound, respectively relative to the total mass of the electrolyte, are added to the electrolyte in order to suppress decrease in the charge/discharge cycle life property and swelling of a battery when left in high temperature environments. |
