| abstract |
The invention relates to a lithium-containing composite oxide, which has a core-shell structure and a chemical formula as follows: [ Li ] a (Ni 1‑x‑y‑z Co x M1 y M3 z )O 2 ] d ·[Li s (Ni 1‑m‑n Co m M2 n ) 1‑ t M4 t O 2 ] 1‑d The chemical formula of the core is Li a (Ni 1‑x‑y‑ z Co x M1 y M3 z )O 2 The chemical formula of the shell is Li s (Ni 1‑m‑ n Co m M2 n ) 1‑t M4 t O 2 (ii) a Wherein x, y, z, m, n, a, s, t and d are mole fractions, and x>0，0.01≤y≤0.10，0≤z≤0.02，m>N is more than or equal to 0, 0.2 and less than or equal to 0.4, a is more than or equal to 1.01 and less than or equal to 1.07, s is more than or equal to 1.01 and less than or equal to 1.07, t is more than or equal to 0 and less than or equal to 0.02, 1-x-y-z is more than or equal to 0.60 and less than or equal to 0.96, 1-m-n is more than or equal to 0.30 and less than or equal to 0.70, and d is more than or equal to 0.70 and less than or equal to 1; the powder resistivity of the lithium-containing composite oxide was 120-244 Ω · cm. The lithium-containing composite oxide with the core-shell structure can be used for preparing a lithium ion battery with better performance. |