Patent ID: 6379402
Filing Date: 2002-04-30
Classification: H01G,Y02E

Abstract:
A process for producing a large capacitance electric double layer capacitor, which comprises a step of:forming an element by disposing a positive electrode and a negative electrode containing a carbon material having a specific surface area of at feast 500 m2/g to face each other with a separator interposed and then vacuum-drying the element at a high temperature; accommodating the element in a metal container; impregnating the element with a non-aqueous electrolyte and then applying a voltage in the range of 1 to 1.5 times the rated voltage across the positive electrode and the negative electrode; maintaining the element in the container, for a determined period of time, under a reduced pressure for purging at least a gas produced; injecting an inert gas in the container to bring the pressure back to the atmospheric pressure; and sealing the metal container.