A long life double layer capacitor and method of making the same including
a case and a first terminal with an electrically insulating hermitic seal
interposed between the first terminal and the case. A first current
collector foil is electrically coupled to an interior portion of the first
terminal and a first electrode comprising carbon which is juxtaposed
against the first current collector foil. A porous separator is then
juxtaposed against the first electrode comprising carbon and separating
the first electrode from a second electrode comprising carbon. A second
current collector foil is juxtaposed against a side of the second
electrode and is electrically coupled to the second terminal. And an
electrolyte solution saturates the first and second electrodes comprising
carbon and is substantially contained by the case and the electrically
insulating hermitic seal such that an influx of impurities into the
electrolyte solution is substantially inhibited by the case and the
electrically insulating hermetic seal.
