Solid electrolyte composition

The present invention relates to a solid electrolyte composition comprising: a) at least one (per)fuoropolyether comprising a (per)fluoropolyoxyalkylene chain [chain (Rpf)] having two chain ends, wherein at least one chain end has formula (I): -[CH(J)CH2O]na[CH2CH(J)O]na'-H (I) wherein each J is independently H, aryl, straight or branched alkyl, and na and na', equal to or different from each other, are zero or an integer from 1 to 50, with the proviso that na+na' is from 1 to 50; b) a poly(alkylene oxide) comprising chains of formula (II): R1 B-[OCHR1 A(CH2)jCHR2 A]n-OR2 B (II) wherein each of R1 A and R2 A is independently a hydrogen atom or a C1-C5 alkyl group, j is zero or an integer of 1 to 2, R1 B and R2 B is independently a hydrogen atom or a C1-C3 alkyl group, and n is an integer from 5 to 1000, and c) at least one lithium salt.