FULL-GRADIENT NICKEL COBALT MANGANESE POSITIVE ELECTRODE MATERIAL, RUTHENIUM OXIDE COATED MATERIAL AND PREPARATION METHOD THEREOF

摘要

The present invention discloses a full-gradient nickel cobalt manganese positive electrode material, a ruthenium oxide coated material and a preparation method thereof. The material has a chemical formula of LiNi_xCo_yMn_(1-x-y)O₂, wherein, 0.5≤x≤0.9, 0.05≤y≤0.40, 1-x-y0. A content of the nickel element is gradually decreased from a core portion to an outer surface of the full-gradient nickel cobalt manganese positive electrode material. A content of the manganese element is gradually increased from the core portion to the outer surface of the full-gradient nickel cobalt manganese positive electrode material. And, a content of the cobalt element is uniformly distributed in the full-gradient nickel cobalt manganese positive electrode material. The present invention also discloses a preparation method of the full-gradient nickel cobalt manganese positive electrode material. The present invention also discloses a preparation method of the ruthenium oxide coated material.