The invention relates to a gradient distribution multivariate
composite material precursor as well as a preparation method of the gradient distribution multivariate
composite material precursor and an application in preparation of a
lithium ion battery
anode material. The precursor is prepared from the following molecular formula: NixCoyMnzM1-x-y-z(OH)2, wherein x is more than 0.2 and less than 0.8, y is more than 0.1 and less than 0.5, z is more than 0 and less than 0.6, and M is a doped
metal ion and comprises one or more of Mg, Ca, Zn, Al, Cr, Zr and Ti; the precursor comprises a core part and an outer layer shell part in which multiple
layers are sequentially covered in the core; a molecular formula composition of the core part is NikConMnmM1-k-n-m(OH)2, wherein k is more than 0.5 and less than 1, n is more than 0.05 and less than 0.5, and m is more than 0 and less than 0.6; and the outer layer shell part is used for controlling the proportion of the
raw material components and a preparation process to ensure that the material composition of the outer layer shell part is distributed in a gradient mode. Compared with a ternary material with a uniform internal structure, the
lithium ion battery
anode material has the advantages that the high
specific discharge capacity is developed; and meanwhile, the
cycling stability, the high-
temperature cycling stability and the rate capability of the materials also can be greatly improved.