Preparation method of single-crystal-morphology lithium ion battery positive electrode material

Abstract

The invention discloses a preparation method of a single-crystal-morphology lithium ion battery positive electrode material. The preparation method comprises the following steps: (1) adding a metal salt solution and a sodium hydroxide solution into a reaction kettle, and carrying out a co-precipitation reaction to prepare precursor slurry; (2) mixing a precursor slurry with a lithium source and a doping agent by a wet method, and performing spray drying to obtain a precursor mixture; (3) performing primary sintering on the precursor mixture to obtain a primary sintering product; and (4) washing the primary sintering product with water, mixing the washed product with a coating agent, and carrying out secondary sintering to obtain the single-crystal-morphology lithium ion battery positive electrode material. In the preparation method, the precursor slurry is prepared by adopting an ammonia-free process, particles formed by stacking a plurality of fine particles are formed, the specific surface area of the precursor is very large and is greater than 100m < 2 > / g, and the precursor with an ultrahigh specific surface area is easier to form a single-crystal positive electrode material with uniformly dispersed primary particles after being sintered, so that development of the capacity is facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a preparation method of a single-crystal morphology lithium-ion battery cathode material. Background technique [0002] Lithium-ion secondary battery is an ideal energy storage battery, which has the advantages of high energy density and good cycle performance. It has not only achieved rapid development in the field of various consumer electronics products, but also has been gradually promoted and applied to electric vehicles and power generation energy storage. field. Anode materials with single crystal morphology have the advantages of high energy density and high safety performance and are widely used in lithium-ion secondary batteries. [0003] However, the current main preparation idea of ​​single-crystal positive electrode materials is: firstly, the metal salt and sodium hydroxide are co-precipitated under the action of ammonia com...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the complex synthesis process of the single crystal morphology lithium ion battery positive electrode material in the prior art mentioned in the above background technology, In view of technical problems such as large energy consumption and high cost of raw materials, a method for preparing a cathode material for lithium-ion batteries with a single crystal morphology and low raw material cost is provided.

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