Supercapacitor has nonaqueous electrolyte and electrode active charcoal

The invention relates to a supercapacitor having a non-aqueous electrolyte and two carbon electrodes each containing a binder and an electrochemically active material constituted by active carbon having a specific surface area greater than about 2000 m2/g. The binder has a mixture of carboxymethylcellulose and a copolymer of styrene and butadiene.