▎ 摘　　要

NOVELTY - High energy density graphite composite material comprises an outer shell and an inner shell, where the inner core comprising graphite, and outer shell comprising titanium niobate, graphene and amorphous carbon, where the mass ratio of the outer shell to the inner shell is (1-10):(90-100). USE - Used as high energy density graphite composite material. ADVANTAGE - The composite material: uses titanium niobate with large interlayer spacing; has high characteristics of high lithium ion conductivity; increases the intercalation/deintercalation rate of lithium ions; improves cycle performance. The method: improves fluid retention; reduces expansion; and improves rate and cycle performance of the material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high energy density graphite composite material comprising (i) adding high-molecular polymer, crosslinking agent and sulfuric acid to a mixer, stirring uniformly, reacting at 150-300degreesC to obtain cross-linked polymer, (ii) dissolving the cross-linked polymer in the organic solvent, filtering, vacuum drying for 48 hours to obtain the precursor material A, (iii) preparing titanium niobate solution with concentration of 1-10%, adding precursor material A, graphene conductive liquid into the titanium niobate solution, stirring uniformly, and drying, (iv) performing pre-carbonization treatment at 400-600degreesC, carbonizing for 1-6 hours, (v) cooling the temperature to room temperature, and crushing, (vi) raising the temperature to 1000-1600degreesC, continuously carbonizing for 1-6 hours, crushing to obtain the precursor coating material B, (vii) taking graphite, asphalt and precursor coating material B into a grinder, mixing uniformly, grinding at 150-300degreesC, performing pre-carbonization treatment for 1-6 hours, (vii) continuously raising the temperature to 700-1000degreesC, insulating for 1-6 hours, then cooling under the inert atmosphere, cooling to room temperature, crushing to obtain the graphite composite material.