▎ 摘　　要

NOVELTY - preparing polyphenol-modified polymer film, comprises providing polymer layer and performing corona treatment on the surface of the polymer layer, coating the modified liquid on the surface of the polymer layer after corona treatment, and drying to prepare a modified layer. The modification liquid comprises 0.5-4 wt.% polyphenolic compounds and 0.25-4 wt.% crosslinking agent. The polyphenolic compounds are catechol, pyrogallol, gallic acid, tannin, catechin, anthocyanin, quercetin, ellagic acid, eriodictyol, dopamine, chlorogenic acid, luteolin, apigenin, myricetin and/or epigallocatechin gallate. USE - The polymer film is useful in preparing medical device, packaging material, printed matter or electronic component (claimed) in packaging, printing, electronic and other fields to be focused on industrial. ADVANTAGE - The method is simple and easy processing technology, low cost, high processing efficiency and easy to enlarge. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: Polyphenol-modified polymer film. Metallized polymer film, comprising the polypolyphenol-modified polymer film, and a metal layer disposed on the modified layer of the polypolyphenol-modified polymer film. Composite current collector, comprising the metallized polymer film. Battery, comprising the composite current collector. Electronic device, comprising the battery.