Patent ID: 8107223

Claim:
An asymmetric supercapacitor comprising a positive electrode comprising a current collector and a first active material selected from the group consisting of a layered double hydroxide of formula [M 2+ 1−x N x 3+ (OH) 2 ]A n− x/n ·mH 2 ) where M 2+ is at least one divalent metal, N 3+ is at least one trivalent metal and/or a non-metal and A is an anion of charge n−, where x and y are greater than zero and less than 1 and n is 1, 2, 3, or 4; LiCoO 2 , LiCo x Ni y O 2 , LiCo x Ni y Mn (1−x−y) O 2 where x and y are greater than zero and less than 1; sulfides of formula MS x where x is from 1 to 10 and M is at least one selected from the group consisting of Co, Ni, Fe, Cu, Ag, Mo and W; Li x Co y (PO 4 ) z and Li x Ni y (PO 4 ) z where x, y and z are greater than zero and less than 1; activated carbon and graphite and a combination comprising at least one of the foregoing active materials: a negative electrode comprising at least one material selected from a carbonaceous active material, Zn, Al, Mg, Ca, Cr, La, V, Ti, Li, Na; a metal oxide of formula MO x , where 0<x<3 and M is at least one selected from the group consisting of Ti, V, Nb, Cr, Mo, W, Mn, Fe, Co, Ni, Pd, Pt, Cu and Ag; a sulfide of formula MS x , where x is from 1 to 10 and M is at least one selected from the group consisting of Co, Ni, Fe, Cu, Ag, Mo and W; Li x MoO 6−x)/2 where x and y are greater than zero and less than 1 and a conductive polymer: a solid electrolyte or an aqueous electrolyte solution selected from the group consisting of aqueous solutions of hydroxides of alkali metals, aqueous solutions of carbonates of alkali metals, aqueous solutions of chlorides of alkali metals, aqueous solutions of bromides of alkali metals, aqueous solutions of iodides of alkali metals, aqueous solutions of sulfates of alkali metals, aqueous solutions of nitrates of alkali metals, and a combination comprising at least one of the foregoing aqueous solutions or a non-aqueous ionic conducting electrolyte solution containing a salt and a non-aqueous solution: and a separator plate.