Yttrium-doped Ni-Co-Al lithium ion battery positive electrode material and preparation method thereof

Abstract

The invention discloses an yttrium-doped Ni-Co-Al lithium ion battery positive electrode material and a preparation method thereof. The molecular formula of the yttrium-doped Ni-Co-Al lithium ion battery positive electrode material is LiNi<x>Co<y>Al<z>YO<2>, wherein b is 4 / 3-a / 3-x-y-z, a is more than or equal to 1 but less than or equal to 1.2, x is more than or equal to 0.3 but less than orequal to 0.98, y is more than or equal to 0.01 but less than or equal to 0.6, z is more than or equal to 0.001 but less than or equal to 0.6, and b is more than or equal to 0.00001 but less than or equal to 0.2. A Ni-Co-Al single-crystal composite precursor and a nanoscale yttrium compound are mixed in advance at an ultrahigh speed, a mixture of the Ni-Co-Al single-crystal precursor and the yttrium compound and a conventional Ni-Co-Al precursor are mixed at a high speed, so that a mixing effect is improved; and since the single-crystal composite precursor is high in mechanical strength, can be mixed at an ultrahigh speed and cannot be broken, meanwhile, the single-crystal composite precursor simultaneously can have an effect of touching a medium, the nanoscale yttrium compound is fully dispersed, and a doping element and a main element are fully mixed.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of battery cathode materials, and in particular relates to yttrium-doped nickel-cobalt-aluminum lithium-ion battery cathode materials and a preparation method thereof. Background technique [0002] Nickel-cobalt-aluminum ternary lithium-ion battery cathode materials are widely used in IT products and new energy vehicles due to their high energy density and relatively simple preparation process. However, due to the poor structural stability of pure nickel-cobalt lithium aluminate, it is easy to collapse the material structure due to the deintercalation of Li ions and the change of the valence state of Ni, Co, and Al ions during the charging and discharging process, which affects the cycle life of the material. and safety hazards. In order to solve the above problems, it is improved by adding an appropriate amount of Y ions, because Y 3+ with you 3+ The valence state is the same, the ...

AI Technical Summary

Problems solved by technology

[0005] Another object of the present invention is to provide a method for preparing the above-mentioned yttrium-doped nickel-cobalt-aluminum-lithium-ion battery positive electrode material, by firstly mixing the nano-scale doping element with the nickel-cobalt-aluminum single crystal composite precursor at an ultra-high speed in advance, and then mixing it with High-speed mixing of other common nickel-cobalt-aluminum composite precursors solves the problem of uneven mixing of doping elements and main elements