NOVELTY - A separator having two surfaces is provided, and a coating composition comprising a polymer and electrolyte salt(s) (I) is applied on surface(s) of the separator, to obtain a coating layer on the surface. The obtained coating layer is dried, to obtain a coated separator. The polymer is vinylidene fluoride polymer and comprises recurring units derived from comonomer(s) (C) which is different from vinylidene fluoride, and recurring units derived from (meth)acrylic monomer(s) (II).    USE - Manufacture of coated separator used for manufacturing electrochemical device e.g. lithium-ion secondary battery (all claimed), primary battery, fuel battery, solar battery and capacitor.    ADVANTAGE - The method enables manufacture of coated separator having excellent chemical/physical stability and wettability. The battery containing the coated separator has excellent cycle characteristics and discharge capacity.    DETAILED DESCRIPTION - A separator having two surfaces is provided, and a coating composition comprising a polymer and electrolyte salt(s) of formula: A+B- (I) is applied on surface(s) of the separator, to obtain a coating layer on the surface. The obtained coating layer is dried, to obtain a coated separator. The polymer is vinylidene fluoride polymer, and comprises recurring units derived from comonomer(s) (C) which is different from vinylidene fluoride, and recurring units derived from (meth)acrylic monomer(s) of formula (II).    A+=ion chosen from alkaline metal cations;    B-=ion chosen from anions;    R 1-R3=H or 1-3C hydrocarbyl;and    R'=H or 1-5C hydrocarbyl comprising 1 or more hydroxy.    INDEPENDENT CLAIMS are included for the following:    (1) separator, which is coated on surface(s), in which the coating comprises the polymer and electrolyte salt(s) (I), and has a dry thickness of 0.1-10 mu m, preferably 1-5 mu m; and    (2) manufacture of electrochemical device, which involves providing separator having two surfaces, applying coating composition on surface(s) of the separator, obtaining coated separator, interposing the coated separator between a cathode and an anode to produce an electrochemical device and injecting an electrolyte into the electrochemical device.