A multilayer assembly comprising: - a metallic layer (a) comprising more than 95% in weight with respect to the total weight of the metallic layer of lithium metal, sodium metal, magnesium metal, zinc metal, their alloys with silicon or tin, said metallic layer (a) comprising a first surface and a second surface; - a coating layer (b), which is permanently attached to at least one of said first surface and second surface of metallic layer (a) as classified as 5B to 3B in the cross-cut test according to ASTM D3359, test method B, wherein (b) comprises a hybrid inorganic/organic composition obtained by reacting: i. a compound of formula X 4-m AY m wherein X is a hydrocarbon group, optionally comprising one or more functional groups, m is an integer from 1 to 4, A is an element selected from the group consisting of Si, Ti and Zr, and Y is a hydrolysable group selected from the group consisting of an alkoxy group, an acyloxy group and a hydroxyl group and ii. at least one fluoro co-polymer, that comprises recurring units deriving from vinylidene difluoride and recurring units deriving from at least a (meth)acrylic monomer of formula: wherein each of R 1, R 2 and R 3, equal to or different from each other, is independently a hydrogen atom or a C 1 -C 3 hydrocarbon group, and R OH is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one hydroxyl group, wherein by reaction of the said compound and the said fluoro co-polymer, the inorganic residues deriving from polycondensation of compound are at least partially chemically bound to co-polymer via reaction with the groups -O-R OH of co-polymer, characterized in that (b) comprises: iii. an electrolyte salt (ES-1) and iv. an ionic liquid (IL-1), wherein the thickness of the coating layer (b) is from 2 to 5 micrometers. - a metallic layer (a) comprising more than 95% in weight with respect to the total weight of the metallic layer of lithium metal, sodium metal, magnesium metal, zinc metal, their alloys with silicon or tin, said metallic layer (a) comprising a first surface and a second surface; - a coating layer (b), which is permanently attached to at least one of said first surface and second surface of metallic layer (a) as classified as 5B to 3B in the cross-cut test according to ASTM D3359, test method B, wherein (b) comprises a hybrid inorganic/organic composition obtained by reacting: i. a compound of formula X 4-m AY m wherein X is a hydrocarbon group, optionally comprising one or more functional groups, m is an integer from 1 to 4, A is an element selected from the group consisting of Si, Ti and Zr, and Y is a hydrolysable group selected from the group consisting of an alkoxy group, an acyloxy group and a hydroxyl group and ii. at least one fluoro co-polymer, that comprises recurring units deriving from vinylidene difluoride and recurring units deriving from at least a (meth)acrylic monomer of formula: wherein each of R 1, R 2 and R 3, equal to or different from each other, is independently a hydrogen atom or a C 1 -C 3 hydrocarbon group, and R OH is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one hydroxyl group, wherein by reaction of the said compound and the said fluoro co-polymer, the inorganic residues deriving from polycondensation of compound are at least partially chemically bound to co-polymer via reaction with the groups -O-R OH of co-polymer, characterized in that (b) comprises: iii. an electrolyte salt (ES-1) and iv. an ionic liquid (IL-1), wherein the thickness of the coating layer (b) is from 2 to 5 micrometers. i. a compound of formula X 4-m AY m wherein X is a hydrocarbon group, optionally comprising one or more functional groups, m is an integer from 1 to 4, A is an element selected from the group consisting of Si, Ti and Zr, and Y is a hydrolysable group selected from the group consisting of an alkoxy group, an acyloxy group and a hydroxyl group and ii. at least one fluoro co-polymer, that comprises recurring units deriving from vinylidene difluoride and recurring units deriving from at least a (meth)acrylic monomer of formula: wherein each of R 1, R 2 and R 3, equal to or different from each other, is independently a hydrogen atom or a C 1 -C 3 hydrocarbon group, and R OH is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one hydroxyl group, wherein by reaction of the said compound and the said fluoro co-polymer, the inorganic residues deriving from polycondensation of compound are at least partially chemically bound to co-polymer via reaction with the groups -O-R OH of co-polymer, characterized in that (b) comprises: iii. an electrolyte salt (ES-1) and iv. an ionic liquid (IL-1), wherein the thickness of the coating layer (b) is from 2 to 5 micrometers. wherein each of R 1, R 2 and R 3, equal to or different from each other, is independently a hydrogen atom or a C 1 -C 3 hydrocarbon group, and R OH is a hydrogen atom or a C 1 -C 5 hydrocarbon moiety comprising at least one hydroxyl group, wherein by reaction of the said compound and the said fluoro co-polymer, the inorganic residues deriving from polycondensation of compound are at least partially chemically bound to co-polymer via reaction with the groups -O-R OH of co-polymer, characterized in that (b) comprises: iii. an electrolyte salt (ES-1) and iv. an ionic liquid (IL-1), iii. an electrolyte salt (ES-1) and iv. an ionic liquid (IL-1), wherein the thickness of the coating layer (b) is from 2 to 5 micrometers.