| abstract |
Disclosed is a separator for electric double layer capacitors which is a porous film composed of an aromatic polyamide having a film thickness of 5 to 50 &mgrm, a porosity of 30 to 80%, an air permeability of 5 to 300 second/100mL.in<SP>2</SP>, and a puncture strength per unit film thickness of not less than 50 mN/mum. The separator for electric double layer capacitors has sufficient heat resistance, mechanical strength and ion permeability. Also disclosed is an electric double layer capacitor using such a separator. |