Doped nickel cobalt lithium manganese oxide precursor and preparation method thereof, doped nickel cobalt lithium manganese oxide positive electrode material

Abstract

The invention discloses a doped nickel cobalt lithium manganate precursor, the molecular formula is Ni x co y mn z Al t (OH) 2+3t ·nWO 4 , where x+y+z=1, 0.4<x<1.0, 0<y≤0.5, 0<z≤0.5, 0<t<0.2, 0<n<0.2, Al and W are in the atomic scale in the precursor The uniform mixing on the surface, the primary particles of the precursor are regular lath-shaped and vertically loosely arranged, and the secondary particles are spherical in shape with a diameter distance not greater than 0.75. The preparation method of the doped nickel cobalt lithium manganate precursor is also disclosed. The doping elements in the precursor material of the present invention realize uniform mixing at the atomic level, which is beneficial to improving the electrochemical performance of the positive electrode material, and the secondary particles of the precursor material of the present invention do not crack during the production process, and the shape remains intact. The preparation method has a simple process flow, can stably prepare a good-quality precursor in batches, and has broad application prospects.

Description

Doped type nickel cobalt manganate precursor and preparation method thereof, and doped type lithium nickel cobalt manganate Positive electrode material technical field The invention belongs to the field of lithium ion battery materials, and in particular relates to a kind of doped nickel cobalt lithium manganate precursor and preparation thereof. Preparation method and doped nickel cobalt lithium manganate cathode material. Background technique [0002] With the continuous introduction of my country's environmental policies and the stricter law enforcement, the environmental protection industry has entered a period of rapid development. The development of new energy materials, especially power vehicles, bears the policy response to green environmental protection and realizes the bending of the automobile industry. The mission of overtaking. In the country to vigorously promote the development of new energy vehicles, the scale of production and sales of power vehicles ...

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Problems solved by technology

At present, when the existing precursor doping process is used to dope Al and W elements at the same time, it is difficult to achieve co-precipitation in the true sense, and the effect of uniform doping cannot be obtained to achieve uniform mixing on the atomic scale. For example, CN109336193A discloses multi-element In-situ co-doping ternary material precursor method, CN 108550833 A discloses a method for preparing bulk-doped lithium cobaltate, and CN 108682807A discloses a method for preparing a precursor that mentions element doping, etc., although the present Co-precipitation doping is mentioned in some patents, but the specific doping method is unclear, or in the synthesis scheme of coprecipitation doping by existing means, it is difficult to realize the co-precipitation of doping elements W and Al and the co-precipitation of doping elements Co-precipitation with Ni, Co, Mn leads to uneven doping and poor doping effect

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