| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery in which a current interruption mechanism can operate appropriately.SOLUTION: In a lithium ion secondary battery 100, at least one of a positive electrode 220, a negative electrode 240 and separators 262, 264 has a hydrophilic part where a hydrophilic functional group exists, and the amount of lithium hydroxide (soluble LiOH) eluting from a positive electrode active material layer 223, when it is immersed into water, is set in a range of 0.014-0.035 mass% by Li conversion in the positive electrode active material layer 223 based on neutralization titration. |
