Purification method for copper foil

Abstract

A purification method for a copper foil, which belongs to the field of material purification. The purification method for a copper foil comprises: placing an assembly in a central temperature zone of a tubular furnace, and annealing same for at least 5 h in a mixed atmosphere of an inert gas and hydrogen under the condition that the temperature of the central temperature zone is maintained at 1050-1070° C., so as to obtain a purified single-crystal copper foil, wherein the assembly is composed of a polycrystalline copper foil containing impurities and a carrier supporting the polycrystalline copper foil, the polycrystalline copper foil is a rolled copper foil, the flow of the inert gas is 500-600 sccm, and the flow of the hydrogen is 30-100 sccm. The purification method can not only directly purify an industrial polycrystalline copper foil and alleviate the problems of an existing purification method being high in terms of energy consumption and high in terms of preparation difficulty, but also convert the industrial polycrystalline copper foil into a single crystal and improve the product performance.

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