Positive electrode current collector and preparation method and use thereof

A method for preparing a positive electrode current collector having a multilayered structure and comprising a plastic thin film wherein upper and lower surfaces of the plastic thin film are coated with a bonding force enhancement layer, an aluminum metal coating layer and an anti-oxidization layer in sequence, comprising the steps of:

• S1:
• treating surfaces of a plastic thin film to be coated with corona, then feeding the plastic thin film which is in a wound form to a vacuum chamber in a double-side roundtrip electron beam evaporation coating machine, sealing the vacuum chamber, evacuating gradually to a vacuum level of 3×10−3 to 6×10−3 Pa, bombarding evaporation material Al2O3 with accelerated electrons by using an electron gun, and adjusting unwinding speed, rewinding speed and evaporation rate, with the Al2O3 absorbing heat and being vaporized, to form a layer of Al2O3 coating, that is, the bonding force enhancement layer, on the surfaces of the moving thin film;
• S2:
• feeding the thin film coated with Al2O3 obtained in step S1 to the vacuum chamber of the double-side roundtrip electron beam evaporation coating machine, sealing the vacuum chamber, evacuating gradually to a vacuum level of 4×10−2 to 6×10−2 Pa, heating an evaporation device to 1300° C.-1400° C., then delivering aluminum to the evaporation device, and adjusting unwinding speed, rewinding speed, and evaporation rate, with the aluminum being persistently melted and evaporated in the evaporation device, to form a layer of aluminum coating, that is, the aluminum metal coating layer, on the surfaces of the moving thin film;
• and
• S3:
• feeding the thin film coated with aluminum obtained in S2 to the vacuum chamber of the coating machine, sealing the vacuum chamber, evacuating gradually to a vacuum level of 3×10−3 to 6×10−3 Pa, bombarding evaporation material Al2O3 with accelerated electrons by using an electron gun, and adjusting unwinding speed, rewinding speed and evaporation rate, with the Al2O3 absorbing heat and being vaporized, to form a layer of Al2O3 coating, that is, the anti-oxidization layer, on the surfaces of the moving thin film.