▎ 摘　　要

NOVELTY - Lithium-rich transition metal oxide-reduced graphene oxide (rGO)-carbon composite lithium supplement additive comprises core-shell structure with double carbon coating comprising lithium-rich transition metal oxide core, graphene layer coated on the surface of the core, and amorphous carbon layer coated on the surface of the graphene layer. The particle size of the lithium-rich transition metal oxide-rGO-carbon composite lithium supplement additive is ≤ 5 µm, and the specific surface area is 200-800 m2/g. USE - The supplement additive is useful for preparing lithium-ion batteries, preferably preparing anodes for lithium-ion batteries and preparing anode materials for lithium-ion batteries (claimed). ADVANTAGE - The carbon coating: has excellent synergy for reducing the grain size of lithium-rich transition metal oxide and improves the air stability of lithium-rich transition metal oxide; helps to improve the air stability; promotes its preferential participation in the construction of the SEI film of the cathode; improves the first charge; and discharges coulomb efficiency. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing the supplement additive, comprising (1) dispersing the iron source and graphene in the liquid phase, assembling to obtain the iron source-rGO precursor, where the iron source is iron oxide, and the weight ratio of iron source and graphene is 1:0.01-0.1, (2) activating the iron source-rGO precursor, lithium source, and amorphous precursor carbon source by ball milling and sintering in protective atmosphere to prepare the lithium-rich transition metal oxide-rGO-carbon lithium supplement additive, dividing the roasting process into the first roasting and the second roasting, where the temperature of the first roasting is 500-700℃, and the temperature of the second roasting is 800-900℃; lithium-ion battery replenishment cathode material, comprising 2-15 wt.% lithium-rich transition metal oxide-rGO-carbon composite lithium supplement additive, 1-15 wt.%, preferably 5-10 wt.% conductive agents, 1-15 wt.%, preferably 5-10 wt.% binders and anode active material (balance amount), where the anode active material is lithium cobalt(III) oxide, lithium iron phosphate and/or nickel cobalt manganese oxide (NCM) ternary materials; and lithium-ion battery, comprising the lithium-rich transition metal oxide-rGO-carbon composite lithium supplement additive and lithium-supplementing cathode material.