High-safety composite positive current collector as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of battery materials, and relates to a high-safety composite positive current collector and a preparation method and application thereof. The positive current collector has the effect of pertinently solving or slowing down the safety problem of a battery cell and comprises an aluminum foil substrate and composite layers arranged on the upper surface and the lower surface of the aluminum foil substrate, each composite layer comprises a conductive carbon layer and a mica coating, and the conductive carbon layer is arranged between the surface of the aluminum foil and the mica coating; the mica coating is composed of dot matrix units which are distributed in an array mode. The positive plate prepared from the current collector is excellent in performance, and when the positive plate is applied to a battery, the safety of the battery can be remarkably improved. The positive electrode current collector is prepared through aluminum foil substrate pretreatment, conductive slurry preparation, conductive carbon layer coating, carbon-coated aluminum foil pretreatment, mica insulation slurry preparation and mica coating coating. The method has the advantages of easily available raw materials, simple process flow and easy large-scale production.

Images