NOVELTY - The membrane has a separation-membrane coating layer (24) formed in a surface of a separation membrane base material. Content of fluorine-type quaternary ammonium salt present in the separation-membrane coating layer is 0.5-50 wt.%. The separation-membrane base material is made of porous base material. Thickness of the separation membrane coating layer is 1-100 micrometer. Thickness of the separation membrane base material is 1-300 micrometer. The negative electrode layer (22) is formed on a positive electrode layer (23) and arranged in a battery container (25).    USE - Coating separation membrane for an electrochemical element e.g. lithium cell such as lithium ion secondary battery (all claimed) of an electric vehicle, a mobile telephone, a portable computer and a hybrid vehicle in a battery-related technical field. Can also be used for a primary battery, a fuel cell, a solar cell, a super capacitor element, a lithium metal secondary battery, a lithium polymer secondary battery and a lithium ion polymer secondary battery.    ADVANTAGE - The membrane can distribute static electricity of the membrane, with which polyvinylidene fluoride is coated so as to avoid generate of problem by electrostatic, so that decline in capacity retention ratio by charging/discharging cycle progressing can be suppressed.    DETAILED DESCRIPTION - The separation-membrane coating layer is made of polyvinylidene chloride, polybenzimidazole, polyimide, polyvinyl acetate, polyacrylonitrile, polyvinyl alcohol, carboxymethyl cellose, starch, hydroxypropyl cellose, regeneration cellose, polyvinylpyrrolidone, TFE, polyethylene, polypropylene, polystyrene, polymethylmethacrylate, polyaniline, acrylonitrile butadiene styrene, phenol resin, epoxy resin, polyethylene terephthalate, PTFE, polyphenyl sulfide, polyamidoimide, polyether imide, polyethylene sulfone, polyamide, polyacetal, polyphenylene oxide, polybutylene terephthalate, ethylene-propylene-diene terpolymer, sulfonation, styrenebutadiene rubber, fluororubber and fluorinetype quaternary ammonium salt.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a lithium cell.    Negative electrode layer (22)    Positive electrode layer (23)    Separation-membrane coating layer (24)    Battery container (25)    Enclosure part (26)