| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery improved in the deteriorating characteristic thereof by restricting the generation of HF (hydrogen fluoride) in electrolyte when keeping the lithium ion secondary battery under a condition at a high temperature.SOLUTION: This lithium ion secondary battery includes: a positive electrode capable of absorbing/discharging lithium ion; a negative electrode capable of absorbing/discharging lithium ion; a separator arranged between the positive electrode and the negative electrode; and organic electrolyte. The organic electrolyte includes: a plurality of solvents; an additive; and electrolyte. As the additive, a compound represented by formula (1) is included. (In the formula (1), R, Rand Rare each any one of hydrogen, 1-3C alkyl group, fluorine, and 1-3C fluorinated alkyl group). |
