Composite current collector and preparation method and application thereof

The invention provides a composite current collector and a preparation method and application thereof. The composite current collector comprises a polymer base film, and a bonding layer and a composite conductive layer which are sequentially laminated on the surface of at least one side of the polymer base film, the composite conductive layer comprises a carbon layer. The invention develops a novel composite current collector, i.e., the carbon layer is introduced into the composite conductive layer, and due to the unique conductive layer structure, the defect rate of the composite current collector can be reduced, so that the stability of the structure and the performance of the composite current collector is improved, the stability of the composite current collector in the battery processing and circulating process is promoted, and the service life of the battery is prolonged. The preparation method is simple and easy to implement, and large-scale production is easy. 本发明提供一种复合集流体及其制备方法和应用，所述复合集流体包括聚合物基膜，以及在所