Interface self-welding metal-metal fluoride composite current collector and preparation method thereof

The invention discloses a metal-metal fluoride composite current collector with a self-welded interface and a preparation method of the metal-metal fluoride composite current collector. The preparation method comprises the following steps: pretreating the surface of the current collector, growing a metal self-welded layer and coating a metal fluoride functional layer; and the double-interface self-welding layer metal-metal fluoride composite current collector which sequentially comprises the metal fluoride functional layer, the metal self-welding layer and the current collector layer from outside to inside can be prepared in a large area in batches. The method is simple in process, wide in universality, obvious in current collector interface enhancement effect and suitable for continuous batch production. The prepared double-interface self-welding layer metal-metal fluoride composite current collector comprises a metal lithium interface self-welding layer and a current collector interface self-welding layer,