Patent ID: 6349027
Filing Date: 2002-02-19
Classification: H01G,Y02E,Y10T

Abstract:
An electric double layer capacitor comprising a positive electrode assembly and a negative electrode assembly, each electrode assembly having a porous layer comprising a carbonaceous powder and a fluorine-containing polymer fibers formed on at least one side of an aluminum foil current collector, wherein the porous layer contains fibers made of a fluorine-containing polymer having a diameter of at most 0.1 &mgr;m and a length of at least 2 &mgr;m and form a network structure; the positive electrode and the negative electrode being disposed so that the porous layer of the positive electrode assembly and the porous layer of the negative electrode assembly face each other with a separator interposed therebetween to form an element, the element being impregnated with a non-aqueous electrolyte and accommodated in a sealed container, wherein the thickness of the porous layer is from 80 to 200 &mgr;m, the thickness of the aluminum foil current collector is from 20 to 80 &mgr;m, the thickness of the separator is from 30 to 170 &mgr;m, and the density of the porous layer is from 0.50 to 0.80 g/cm3.