| 摘要 |
PROBLEM TO BE SOLVED: To provide a power storage element capable of suppressing peeling off or falling off of an undercoat layer from a base material layer.SOLUTION: A power storage element 10 includes an electrode body 400 formed by laminating a positive electrode 410, a negative electrode 420, and a separator 430. The positive electrode 410 includes a conductive positive electrode base material layer 411, undercoat layers 412 and 413 disposed on the positive electrode base material layer 411, and positive electrode active material layers 414 and 415 disposed on the undercoat layers 412 and 413. A bonding strength between the positive electrode active material layers 414 and 415 and the undercoat layers 412 and 413 is higher at an end portion than at a center portion. In the positive electrode active material layers 414 and 415, a binder amount ratio, which is a ratio at which a binder is contained, is higher at the end portion than at the center portion.SELECTED DRAWING: Figure 5 |
