Aufgepfropfter mikroporöser Separator für elektrochemischen Generator und Herstellungsverfahren

摘要

Separator for an electrochemical generator, consisting of a microporous polyolefin film grafted with at least one monomer chosen from diethylene glycol dimethacrylate, furfuryl acrylate and a diethylene glycol dimethacrylate/acrylic acid mixture. The invention also relates to a process for the manufacture of the separator such that the grafting of the monomer is carried out in three stages: - irradiation of the film, - optional storage of the irradiated film, - immersion of the irradiated film in the grafting solution comprising the monomer, a solvent and at least one additive. A further subject is the application of this separator to an electrochemical generator with an aqueous or nonaqueous electrolyte in which the salt concentration is between 1M and 2M.