▎ 摘　　要

NOVELTY - Polypropylene film comprises 90-99.9 wt.% polypropylene and 0.1-10 wt.% hydroxy-containing sub-nano wire, the hydroxy-containing sub-nano wire comprises hydroxyapatite sub-nanowire, gadolinium oxyhydroxide sub-nano-wire, tungsten oxyhydroxide sub-nano-wire and/or copper oxyhydroxide sub-nano-wire. USE - The polypropylene film is useful for preparing complex current collector. ADVANTAGE - The polypropylene film can improve the surface adhesion performance and mechanical property. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing polypropylene film comprising mixing the polypropylene with the hydroxy-containing sub-nanometer wire, melting, extruding and melting material, subjecting the molten material to casting treatment and biaxially stretching process; (2) complex current collector comprising base material and metal layer, the metal layer is located on at least one surface of the base material, the base material comprises the polypropylene film, optionally, the thickness of the metal layer is 500-2000 nm; (3) electrode pole piece comprising complex current collector; (4) battery comprising electrode pole piece; and (5) electric device comprising a battery.