▎ 摘　　要

NOVELTY - Manufacture of steel strip involves providing a nickel-plated steel strip, and applying a graphene coating layer on one or both sides of the steel strip by a continuous roll-to-roll process, which is performed fully continuously by joining the leading edge of a coil of nickel-plated steel strip to the trailing edge of the preceding coil of nickel-plated steel strip in a joining section before entering the step of fast heating of the nickel-plated steel strip and separating the nickel-plated steel strip after cooling the graphene coated nickel-plated steel strip to produce coils of graphene coated nickel-plated steel strips. The graphene coating layer is applied by fast heating the nickel-plated steel strip at a heating rate of at least 50 degrees C/second in an inert, non-oxidizing or reducing atmosphere in a heating section to heat soak at 400-850 degrees C. The deposition growth time for the graphene coating layer is 0.1-60 seconds. USE - Manufacture of steel strip for battery case of primary alkaline batteries and secondary batteries. ADVANTAGE - The method provides steel strip having low interfacial contact resistance. DETAILED DESCRIPTION - Manufacture of steel strip involves providing a nickel-plated steel strip, and applying a graphene coating layer on one or both sides of the steel strip by a continuous roll-to-roll process, which is performed fully continuously by joining the leading edge of a coil of nickel-plated steel strip to the trailing edge of the preceding coil of nickel-plated steel strip in a joining section before entering the step of fast heating of the nickel-plated steel strip and separating the nickel-plated steel strip after cooling the graphene coated nickel-plated steel strip to produce coils of graphene coated nickel-plated steel strips. The graphene coating layer is applied by fast heating the nickel-plated steel strip at a heating rate of at least 50 degrees C/second in an inert, non-oxidizing or reducing atmosphere in a heating section to a heat soak at 400-850 degrees C, holding the nickel-plated steel strip in the heat soak section at the heat soak temperature, projecting an inert, non-oxidizing or reducing gas carrier comprising a graphene precursor on the heated nickel-plated steel strip in the heat soak section to produce an adhering graphene coating layer on the nickel-plated steel strip, cooling the graphene-coated nickel-plated steel strip in a cooling section containing a cooling medium, which is inert or reducing with respect to graphene, and post-processing the graphene-coated nickel-plated steel strip. The deposition growth time for the graphene coating layer is 0.1-60 seconds. INDEPENDENT CLAIMS are included for the following: (1) graphene-coated nickel-plated steel strip or sheet, which comprises graphene coating layer at least at the side of the strip or sheet corresponding with the inner surface of battery case. The graphene coating layer has a peak height ratio (G/D) of more than 1, where D and G correspond to the peaks at in the Raman spectrum at 1365 cm-1 and 1584 cm-1; and (2) use of graphene-coated nickel-plated steel strip or sheet for manufacturing battery case in drawing operation involving cutting plates or discs from the steel sheet or strip and performing a drawing operation on the plates or discs. The interfacial contact resistance of the battery case wall is at most 20 m Omega .cm2 when measured at a pressure (P) of 1.37 MPa (200 psi).