| 摘要 |
PROBLEM TO BE SOLVED: To suitably improve output of an electrochemical device.SOLUTION: A separator 12 is formed of sheet-like nonwoven fabric and interposed between a pair of electrode sheets 14, 16. The nonwoven fabric is formed of a fiber of polypropylene spun by a melt-blow method, and fine fiber F1 having an average fiber diameter of 0.8 μm and thick fiber F2 having a fiber diameter of 8 μm or more and 30 μm or less are mixed over the entire thickness direction of the nonwoven fabric. |
