Patent ID: 6280883
Filing Date: 2001-08-28
Classification: C07C,H01M,Y02E

Abstract:
An electrolyte composition comprising:(a) a conductive salt comprisinga cation selected from the group consisting of an alkali metal; an alkaline earth metal; a Group IIB metal; a Group IIIB metal; a transition metal; a rare earth metal; a nitrogen onium cation, and a proton; andan anion selected from the group consisting of R.sub.f.sup.0 SO.sub.3- ; in which R.sub.f.sup.0 is a perfluoroalkyl group having between 2 and 4 carbon atoms;an anion of the formula: ##STR17##in which R.sub.f1 and R.sub.f2 are each independently a straight or branched perfluoroalkyl group of 1 to 4 carbon atoms, with R.sub.f1 and R.sub.f2 having a total of up to 5 carbon atoms;and R.sub.f3 is a perfluoroalkylene moiety of 2 to 4 carbon atoms optionally substituted by a straight or branched perfluoroalkyl group of 1 to 2 carbon atoms, with R.sub.f3 having a total of up to 4 carbon atoms;an anion having a formula R.sub.f4 R.sub.f5 N--(CF.sub.2).sub.n' SO.sub.2 --X; ##STR18##in which X.sup.- is --O.sup.-, --N.sup.- SO.sub.2 R.sub.f4, or ##STR19##Z is --CF.sub.2 --, --O--, ##STR20##or --SF.sub.4 --; R.sub.f4, R.sub.f4', and R.sub.f5, independently, are --C.sub.m F.sub.2m+1' or --(CF.sub.2).sub.q --SO.sub.2 --X.sup.- ; R.sub.f6 and R.sub.f7, independently, are --C.sub.m F.sub.2m+1, --(CF.sub.2).sub.4 --SO.sub.2 --X.sup.-, ##STR21##R.sub.f8 is --C.sub.m F.sub.2m+1, or --(CF.sub.2).sub.q --SO.sub.2 --X.sup.- ; R.sub.f6' and R.sub.f7', independently, are perfluoroalkylene moieties having the formula --C.sub.r F.sub.2r --; n' is 1-4; r is 1-4; m is 1-4; and q is 1-4;a bis-fluoroalkylsulfonyl methide anion R.sub.f.sup.II --SO.sub.2 --C.sup.- (R)--SO.sub.2 --R.sub.f.sup.III in which R.sub.f.sup.II and R.sub.f.sup.III, independently, are perfluoroalkyl groups having between 1 and 4 carbon atoms, wherein the sum of R.sub.4.sup.II and R.sub.f.sup.III is up to 5 carbon atoms, and R is H, CN, F, alkyl of 1 to 6 carbon atoms, phenyl or phenyl substituted by alkyl of 1 to 4 carbon atoms;and a tris-(perfluoroalkanesulfonyl)methide anion of the formula .sup.-C(SO.sub.2 R.sub.f.sup.II)(SO.sub.2 R.sub.f.sup.III)(SO.sub.2 R.sub.f.sup.IV) in which R.sub.f.sup.II, R.sub.f.sup.III, and R.sub.f.sup.IV, independently, are perfluoroalkyl groups having between 1 and 4 carbon atoms, wherein the sum of R.sub.f.sup.II, R.sub.f.sup.III and R.sub.f.sup.IV are up to 6 carbon atoms; and(b) a surfactant salt of the formula:((R.sub.f SO.sub.2)(R.sub.f 'SO.sub.2)N.sup.-).sub.n M.sup.+nwherein M.sup.+n is a cation with a valence equal to n;n is from 1 to 4;R.sub.f is a straight or branched perfluoroalkyl group of 1 to 12 carbon atoms, a perfluorocycloalkyl group or a perfluorocycloalkyl perfluoroalkyl group of 4-7 ring carbon atoms and 1-4 carbon atoms on the alkyl chain, which perfluoroalkyl or perfluorocycloalkyl chain may optionally contain catenary heteroatoms; andR.sub.f ' is a straight or branched perfluoroalkyl group of 1 to 12 carbon atoms, a perfluorocycloalkyl group or a perfluorocycloalkyl perfluoroalkyl group of 4-7 ring carbon atoms and 1-4 carbon atoms on the alkyl chain, which perfluoroalkyl or perfluorocycloalkyl chain may optionally contain catenary heteroatoms; wherein R.sub.f and R.sub.f ' have a total of at least 8 carbon atoms; andwherein the molar ratio of conductive salt to surfactant salt is between about 99.9:0.1 to about 75:25.