Composite material negative electrode, battery and preparation method thereof

The invention provides a composite material negative electrode, a battery and a preparation method thereof. The composite material negative electrode comprises a three-dimensional skeleton and activemetal. The three-dimensional skeleton comprises a non-conductive porous dielectric layer prepared from the raw material of a polymer material or an inorganic oxide and a porous conductive layer prepared from the raw material of a carbon material or a metal material, wherein the porous dielectric layer and the porous conductive layer are periodically assembled together to form the three-dimensionalskeleton with alternating conductive/dielectric periods, and the active metal is embedded in the three-dimensional skeleton to form the composite material negative electrode. The periodic conductiveskeleton controls the electron transmission path and the ion concentration distribution so that the composite material negative electrode can effectively improve the stability of the metal negative electrode in the cycle proces