The invention discloses a single-layer porous
nanosheet independent heterostructure
composite film and a preparation method and application thereof, and belongs to the technical field of battery materials. The two-dimensional
porous oxide and the
porous graphene oxide are used as raw materials, the two materials are negatively charged and can repel each other in a solution and are stacked in a staggered manner, heterogeneous
assembly is realized, the
composite film with the two materials stacked alternately is formed, and a conductive frame can stably exist due to electrostatic repulsion. The porous structure and the
lithium-loving characteristic of the two-dimensional
porous oxide are utilized, the two-dimensional
porous oxide and the
porous graphene oxide form a three-dimensional porous interconnected conductive frame, a richer porous structure and more
ion transmission channels are provided, the migration ability of
lithium ions is effectively improved, the
lithium ions can be uniformly nucleated inside,
nucleation only on the surface is avoided, and the performance of the
lithium ion battery is improved. And more
nucleation sites are provided, the
local current density is reduced, and enough space is provided for lithium storage, so that non-uniform
nucleation is avoided, and the growth of lithium dendrites is inhibited.