| 摘要 |
PROBLEM TO BE SOLVED: To provide an electricity storage element capable of suppressing occurrence of overcharge even when voltage rapidly increases in charging.SOLUTION: An electricity storage element 10 includes an electrode body 400 having a positive electrode 410, a negative electrode 420, and separators 431, 432. In the positive electrode 410, a first positive electrode active material layer 412 that is an active material layer including a first kind active material and a second positive electrode active material layer 413 that is an active material layer including a second kind active material having an operation potential higher than that of the first kind active material are formed. The second positive electrode active material layer 413 is arranged at a position facing a negative electrode active material layer non-arrangement region 423 where a negative electrode active material layer 422 formed in the negative electrode 420 is not arranged. |
