| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor separator which will not break, even a high pressure is applied for adhesion with an electrode, is superior in ion permeability and is superior in ionic solution retaining property. SOLUTION: The electric double-layer capacitor has a fiber layer comprising an ultra-fine fiber of fiber diameter of 4μm or less and a thick fiber of fiber diameter of 7μm or more.
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