| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery exhibiting high safety even in too heavy use of the lithium ion secondary battery, and excellent in output characteristics.SOLUTION: A lithium ion secondary battery includes: a positive electrode including a positive electrode collector, a PTC layer provided on the positive electrode collector, and a positive electrode active material layer provided on the PTC layer; and an electrolyte including an ionic liquid in which a lithium salt is dissolved.SELECTED DRAWING: None |
