Abstract: Electrolytic compositions comprising a perfluoropolyether additive of formula (I): wherein: d, e, f are integers; a, b, c can be zero or integers; being a+b+c+d+e+f such that the number average molecular weight ranges from 500 to 5×105; T are end groups —CF2X (X?F,CF3, Cl), —C3F7, —CF(CF3)COO?(1/n)Mn+, —CF2COO?(1/n) Mn+, —CF2C(O(1/n)Mn+)2CF3; Mn? is a cation having valence n=1-4.

Abstract: Hydro-2,2-difluoroalkylvinylethers having the formula CF2═CH—O—RA  (I) wherein RA is a radical containing fluorine, optionally containing halogens such as Cl, Br, I, hydrogen, functional groups CM, COOR′, CON(R′)2, SO2OR′, m wherein R′ is a C1-C5 alkyl, RA being selected from the following: a linear or branched, saturated or unsaturated C2-C20 fluoroalkyl, or a saturated or unsaturated C4-C6 fluorinated cyclic group wherein optionally from 1 to 2 carbon atoms are substituted with oxygen atoms, or a linear, branched saturated or unsaturated, C3-C15 fluorooxyalkyl group, containing one or Core oxygen atoms.