TECHNOLOGY FOCUS - POLYMERS - Preferred Crosslinkable Fluoropolymer: The monomer (H'F) comprises a pendant side chain of any of formula (VI) to (X): C(O)-O-Y-E (VI); C(O)-NH-Y-E (VII); (C(O))n-O-R-O-Y-E (VIII); (C(O))n-O-R-O-C(O)-NH-Y-E (IX); and (C(O))n-O-R-O-C(O)-O-Y-E (X), where Y is a C1-C10 hydrocarbon bonding group, optionally comprising a functional group, R is a C1-C5 hydrocarbon group, optionally comprising a hydroxyl group, n is 0 or 1, and E is an end group of any of formula (III-A) to (V-A). Preferred Crosslinkable Fluoropolymer Film: The film (FC) is free from any organic solvent (solvent (S)). The film (FC) further comprises an organic solvent (solvent (S)). The solvent (S) is selected from diesters of formula (DE-l) and ester-amides of formula (EA-l): R-AOOC-Zde-COORB (DEl); and RA-OOC-ZeaCO-NRCRD (EA-I) where: RA and RB, equal to or different from each other, are independently selected from C1-C20 hydrocarbon groups, RC and RD, equal to or different from each other, are independently selected from hydrogen, C1-C36 hydrocarbon groups, possibly substituted, being understood that RC and RD might be part of a cyclic moiety including the nitrogen atom to which they are bound, the cyclic moiety being possibly substituted and/or possibly comprising an additional heteroatom, and their mixture, and Zde and Zea, equal to or different from each other, are independently a linear or branched C3-C10 divalent alkylene group. The film (FC) further comprises an electrolytic salt. Preferred Method: In the process for manufacturing the crosslinkable fluoropolymer (polymer (FC)), the monomer (HF) is selected from (meth)acrylic monomers of formula (I-A) and vinyl ether monomers of formula (Il-A), where each of R4, R5 and R6, equal to or different from each other, is independently a hydrogen atom or a C1-C3 hydrocarbon group, Rx is a hydrogen atom or a C1-C5 hydrocarbon group comprising a hydroxyl group, and R'x is a C1-C5 hydrocarbon group comprising a hydroxyl group. The functional group in the end group T of the (meth)acrylic compound (compound (MA)) of any of formula (III) to (V) is selected from hydroxyl groups, cyclic alkyl ether groups, isocyanate groups, carboxylic acid groups, amine groups, aryl ether groups and alkoxy silane groups. The process is carried out in a liquid medium comprising an organic solvent (solvent (S)). The monomer (HF) in the polymer (F) comprises an end group of formula (I), where R is a hydrogen atom, and the compound (MA) has any of formula (III) to (V), where T is a C1-C10 hydrocarbon end group comprising a functional group selected from hydroxyl groups, cyclic alkyl ether groups, preferably ethylene oxide groups, and amine groups, preferably primary amine groups, where the compound (MA) has any of formula (III) to (V), where T is a C1-C10 hydrocarbon end group comprising a hydroxyl group, the process being carried out in the presence of an activating agent selected from N,N'-dicyclohexylcarbodiimide, thionyl chloride, oxalyl dichloride and inorganic acids. The monomer (HF) in the polymer (F) comprises an end group of any of formula (I) and (II), where R is a C1-C5 hydrocarbon group comprising a hydroxyl group, and the compound (MA) has any of formula (Ill) to (V), where T is a C1-C10 hydrocarbon end group comprising a functional group selected from hydroxyl groups, cyclic alkyl ether groups, preferably ethylene oxide groups, isocyanate groups and carboxylic acid groups. The compound (MA) has any of formula (III) to (V), where T is a C1-C10 hydrocarbon end group comprising an isocyanate group, the process is carried out in the presence of an activating agent selected from organic tin compounds. EXAMPLE - No suitable example given.