| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery excellent in cycle characteristics even when used in a condition of a high upper limit voltage value.SOLUTION: A lithium ion secondary battery 500 provided by the present invention includes: a positive electrode 530 having a positive electrode active material 534A; a negative electrode 540 having a negative electrode active material 544A; a liquid electrolyte (an electrolytic solution P) 537 including a nonaqueous solvent, a supporting salt and an SEI forming material; and a non-fluid (typically, gelatinous or solid state) electrolyte 536 interposed between the positive electrode active material 534A and the electrolytic solution P. |
