▎ 摘　　要

NOVELTY - Preparing honeycomb multilayer graphene-like foam cathode material comprises (a) mixing potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid, adding crystalline flake graphite, reacting to obtain pre-oxidized graphite; (b) mixing the pre-oxygenated graphite obtained in step (a), sodium nitrate and concentrated sulfonate, cooling and dropping concentrated sulfuric acid and adding potassium permanganate in batches, reacting, cooling to obtain precursor solution; (c) adding precursor solution in batches to deionized water, reacting and adding hydrogen peroxide, then adding deionizing water and cooling, after the cooling liquid is processed to obtain multi-layer oxidation graphene foam; (d) oxidizing the multi-layered graphene foam, cross-linking agent and solvent, adding sodium citrate pentahydrate to stir, obtaining crosslinking material after reaction, washing the crosslinker material to obtain dispersion liquid and freezing and drying the dispersion liquid . USE - The cathode is used in lithium ion battery and in solar cell. ADVANTAGE - Compared with traditional graphene materials, the number of layers of the honeycomb-shaped multi-layer graphene-like foam is controlled between 10-30 layers, which is much higher than the number of layers of graphene. At the same time, the above-mentioned cathode material has a honeycomb-like morphology, and has both the energy storage characteristics of graphene and graphite, so that it can obtain high energy density in the process of sodium storage and potassium storage. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: cathode sheet; and lithium ion battery.