▎ 摘　　要

NOVELTY - Lithium supplementary additive comprises a lithium-rich material core and a shell layer set on the lithium-rich material core. The lithium-rich material core includes a lithium-rich material (I). USE - Lithium supplementary additive used in secondary battery (claimed). ADVANTAGE - The lithium additive can realize the lithium secondary battery of lithium, improve the first efficiency of the battery; has good stability, not easy to react in the air, good for production of the lithium additive, storage and transportation. DETAILED DESCRIPTION - Lithium supplementary additive comprises a lithium-rich material core and a shell layer set on the lithium-rich material core. The lithium-rich material core includes a lithium-rich material of formula aNixMyOz.bLi2O (I), where the M includes Cu, Co, Al, Ti, V, Zr and Fe and the shell layer includes a polymer layer. x = 0.95-1, y = 0.01-0.05, z = 1-1.15, a = 0.8-1.1, b = 0.8-1.1. INDEPENDENT CLAIMS are included for: preparing the lithium supplementary additive; econdary battery. DESCRIPTION OF DRAWING(S) - The drawing shows a structure schematic diagram of the lithium supplement additive. 10Lithium-rich material core 20Shell layer 101Inner layer 102Doped interface layer