| abstract |
An ultracapacitor (10) includes two solid, nonporous current collectors (22, 24), two porous electrodes (14, 16) separating the collectors, a porous separator (18) between the electrodes and an electrolyte (20) occupying the pores in the electrodes and separator. The electrolyte (20) is a polar aprotic organic solvent and a salt. The porous separator (18) includes a wet laid cellulosic material. |