Composite current collector and its preparation method, electrode and battery

Abstract

The present invention relates to a composite current collector and its preparation method, electrodes, and batteries. The composite current collector includes an insulating substrate, a first metal layer set on both surfaces of the thickness direction of the insulating substrate, and a second metal layer set on the surface away from the insulating substrate on the first metal layer. Multiple colloidal particles are attached to the surface of the first metal layer away from the insulating substrate, with the colloidal particles evenly distributed. The second metal layer is set on the first metal layer, and the second metal layer encapsulates the evenly distributed colloidal particles. By setting the composite current collector with specific structures of the colloidal particles, it overcomes the issues of low electrode peel strength and capacity drop in long cycle batteries, significantly enhancing the stability of long cycle battery electrodes.

Dependencies are inferred from the claim text.