Preparation method and application of carbon-coated grapheme-based metal oxide composite

The invention discloses a preparation method and application of a carbon-coated grapheme-based metal oxide composite in a two-dimensional core-shell structure. The carbon-coated grapheme-based metal oxide composite in the two-dimensional core-shell structure is prepared by taking the two-dimensional grapheme in a single-layer carbon atom structure as a carrier and the phenolic resin or polysaccharide as the carbon source precursor. The metal oxide nanoparticles obtained by the method are uniformly loaded on a graphene sheet and well coated in the carbon-coated layer. The preparation method has the advantages of simple process, mild condition and low cost. The Electrochemical tests prove that the carbon-coated grapheme-based metal oxide composite in the two-dimensional core-shell structure has excellent cycle stability and rate properties. The experiments prove that: under the charge and discharge current of 200mAhg , the tin dioxide material has the discharge capacity of 200mAhg , and the ferroferric oxide material has the discharge capacity of 930mAhg . Therefore, better experimental data and theoretical support are provided for the research and the application of the metal oxide in the field of electrochemistry.