PP composite copper foil and preparation method thereof

The invention relates to the technical field of lithium ion thin film batteries, in particular to a PP composite copper foil and a preparation method thereof. The preparation method of the PP composite copper foil comprises the following steps: providing a PP base film; depositing a bottoming copper plating layer on one side or two sides of the PP base film in the thickness direction, wherein the bottoming copper plating layer is prepared by adopting a magnetic filtration multi-arc ion plating process; multiple layers of copper films are deposited on the side, away from the PP base film, of the bottoming copper plating layer, the multiple layers of copper films comprise an odd number of layers and an even number of layers from inside to outside, the odd number of layers are prepared through the magnetron sputtering technology, and the even number of layers are prepared through the multi-arc ion plating technology; and a copper-nickel alloy coating is deposited on the side, away from the bottoming copper coati