▎ 摘　　要

NOVELTY - Composite lithium supplement material includes a compound of graphene and metallic lithium with a mass ratio of 1:0.7-3.5. The graphene is a spinning fiber carrier. The metallic lithium is uniformly distributed on the inside and the surface of the carrier, and the metallic lithium distributed on the surface of the carrier is further coated with a carbon layer. USE - Composite lithium supplement material used for a cathode electrode of a lithium ion battery with high cycle performance (claimed). ADVANTAGE - The composite lithium supplement material adopts electrostatic spinning technology to realize lithium supplementation for the anode material, and uses fibrous graphene as a carrier, so that most of the lithium is encapsulated in the fiber, during the battery cycling process, lithium can be continuously supplied to improve the cycle retention rate of the battery, and obtained lithium ion battery negative composite lithium supplement material has stable performance, high safety, can achieve uniform lithium supplementation, effectively improve the first-time efficiency and energy density of lithium-ion batteries, and ensure long-term performance of lithium-ion batteries. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite lithium supplement material, which involves: (A) dispersing graphene in an organic solvent to obtain a dispersion liquid; (B) adding an organic lithium solution to the dispersion to obtain a spinning solution; (C) electrospinning the spinning solution to obtain spinning fibers; and (D) calcining the spun fiber at high temperature.