| 摘要 |
A separator (6) is disposed between a positive electrode (4) and a negative electrode (5), and includes a main body layer (6A) and a plurality of thin films (6B), (6C). Each of the plurality of thin films (6B), (6C) has a smaller thickness than the main body layer (6A), and a lower ionic permeability ratio than the main body layer (6A). Moreover, the plurality of thin films (6B), (6C) have ionic permeability ratios different from each other. |
