Patent ID: 7088571
Filing Date: 2006-08-08
Classification: H01G,Y02E

Abstract:
1. An electric double-layer capacitor comprising: an element constructed of a positive electrode and a negative electrode which are each composed of a current collecting substrate and an active material composition layered onto one side of the substrate, at least one of which is a polarizable electrode, and which together have a total pore volume, and a separator that lies between the positive and negative electrodes in a state of contact with the active material compositions thereof, and an electrolyte solution; wherein, when the element group is in place within the capacitor, a portion of the separator is sandwiched between the respective active material compositions of the positive and negative electrodes and has a pore volume which is at least 0.4 times the total pore volume within the positive and negative electrodes, and the positive electrode has a pore volume, exclusive of its current collecting substrate, of 50 to 80 vol %. and the negative electrode has a pore volume, exclusive of its current collecting substrate, of 55 to 90 vol %.