Evaluation method for electrolyte resistance of aluminum-plastic composite film

The invention provides a method for evaluating electrolyte resistance of an aluminum-plastic composite film, which comprises the following steps of: (1) providing an aluminum foil with a bright surface and a matt surface, coating a passivation solution on the bright surface of the aluminum foil, and baking after coating to finish passivation treatment of the aluminum foil; (2) soaking the aluminum foil in an electrolyte, wherein the electrolyte comprises an organic solvent and lithium hexafluorophosphate; (3) baking the aluminum foil in a baking oven, taking out, cooling, cleaning and wiping; and (4) testing the fluorine element content on the surface of the aluminum foil by adopting energy spectrum analysis, and representing the electrolyte resistance of the aluminum-plastic composite film by using the fluorine element content. In the technical scheme of the invention, if the fluorine content of the surface of the passivated aluminum foil is high, the electrolyte resistance of the aluminum-plastic composite