Abstract: A method of selecting the nanoporous carbon material for at least one of the polarizable electrodes (positive and/or negative) of EDLC with given organic electrolyte is suggested. The method includes providing of a number of nanoporous carbon materials, which can potentially be used for manufacturing the EDLC electrodes, impregnating the materials with the selected electrolyte followed by measuring the diffusion coefficients of anions and cations of the electrolyte inside the pores of the carbon materials and selecting for positive and negative electrodes the carbon materials, which provide the maximum diffusion coefficients of anions and cations, respectively. A method of manufacturing polarizable electrodes (positive and/or negative) and a method of manufacturing electrochemical double-layer capacitor based on the said method of selecting the nanoporous carbon material are also suggested.

Abstract: Disclosed is a hybrid electrochemical energy storage device which can store much larger energy density than known electrochemical double layer capacitors (EDLC's) and, simultaneously, can provide high power density and efficiency comparable with those of known EDLC's.

Abstract: An electrochemical double layer capacitor (EDLC) is provided. The EDLC can include first and second multi-layered polarizable electrodes arranged within a casing. Each multi-layered polarizable electrode can include a nanoporous carbon layer and a metal current collector layer including a metal substrate having a first surface and a second surface. The first surface can be covered by the nanoporous carbon layer. An organic electrolyte can be impregnated within the nanoporous carbon layer. The first surface of the metal substrate can include a plurality of conductive carbon particles each (i) being locally and individually fused into the first surface of the metal substrate by spot melting an area on the first surface of the metal substrate, (ii) projecting out of the first surface, and (iii) surrounded by a flowed surface of the metal substrate.