摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery having high output performance while retaining capacity.SOLUTION: A secondary battery includes a collector foil (a positive electrode side collector foil 24) and an electrode body having an active material layer provided on one surface side of the collector foil, and uses metal ions of metal included in the active material layer, as mobile ions. The active material layer comprises at least two layers. A first active material layer (a first positive electrode layer 31) on a collector foil side has higher capacity than a second active material layer (a second positive electrode layer 32) on the other side, and is provided with a through hole 33 exposing the collector foil. The second active material layer has higher output than the first active material layer, and is electrically connected to the collector foil via the through hole. |