Preparation method of ultra-thin and ultra-wide silver foil

According to the preparation method, the excellent ductility of oxygen-free copper and the processing performance similar to that of pure silver are utilized, a pure silver sheet is coated with an oxygen-free copper sheet for coating and rolling, direct contact between the silver foil and a roller is avoided, and meanwhile through cooperative control over the heat treatment technology and the rolling deformation amount, the ultra-thin and ultra-wide silver foil is obtained. The width of the silver foil is larger than 300 mm, and the thickness of the silver foil is 4-5 micrometers. The minimum thickness of the prepared silver foil can reach 1 micron, the width of the silver foil is larger than 300 mm, and the silver foil has the advantages that the thickness of the silver foil is ultra-thin, and the width of the silver foil is large. And meanwhile, the preparation equipment is a conventional strip rolling mill, an expensive foil rolling mill is not needed, and the method has the advantages of low requirements