Patent ID: 8920669

Claim:
A hybrid capacitor comprising an electrolyte system wherein the electrolyte system comprises exactly three or four conductive salts: wherein each conductive salt has different anionic and cationic radii from each other conductive salt, wherein at least one of the conductive salts is of Group III below having an anion with a radius of >0.4 nm and a cation with a radius of >0.3 nm, and wherein at least two of the conductive salts are different from the conductive salt of Group III having an anion with a radius of >0.4 nm and a cation with a radius of >0.3 nm and are selected from Groups I-III below, wherein Group I comprises conductive salts having an anion with a radius of <0.4 nm and a cation with a radius of <0.1 nm, Group II comprises conductive salts having an anion with a radius of <0.4 nm and a cation that is [NR 3 R 4 R 5 R 6 ] + , [PR 3 R 4 R 5 R 6 ] + , with R 3 -R 6 are independently of one another CH 3 or C 2 H 5 , and wherein single CH 2 -groups of the aliphatic rings may be substituted by O, S or NR 7 with R 7 =alkyl, and Group III comprises conductive salts having an anion selected from [(C 2 F 5 ) 3 PF 3 ] − or [N(SO 2 C 2 F 5 ) 2 ] − , and a cation that is [NR 10 R 11 R 12 R 13 ] + , [PR 10 R 11 R 12 R 13 ] + , wherein R 10 -R 13 are independently of one another an alkyl group with at least 2 carbon atoms, and wherein single CH 2 -groups of R 10 -R 13 are substituted by heteroatoms.