Method for preparing lithium ion battery cathode material with layered structure

Abstract

The invention provides a method for preparing a lithium ion battery cathode material (Li(NixCoyMn1-x-y-zAlz)O2 with a layered structure, wherein the sum of x y and z is more than or equal to 0 and less than or equal to 1, x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, and z is more than or equal to 0 and less than or equal to 1). The method is environment-friendly, and comprises the following steps of: taking one or more of nickel salt, cobalt salt, manganese salt and aluminum salt as raw materials, adding one or more of organic complexing agents, such as glucose, lactic acid, sodium lactate and the like, into the raw materials and aqueous alkali to perform coprecipitation reaction, and generating spherical or similarly spherical hydroxide precursors; and washing, drying, mixing the spherical or similarly spherical hydroxide precursors and a lithium source, pre-sintering and sintering, and obtaining the lithium ion battery cathode material. The particles of the precursor material prepared by the method are distributed relatively uniformly, and the specific area is large; the layered cathode material has high energy density, high discharging voltage and stable charging and discharging structure; the preparation process for the cathode material is relatively simple, and the production cost is low; and furthermore, the used complexing agents are environment-friendly and pollution-free.

Description

technical field [0001] The invention specifically relates to a method for preparing a positive electrode material with a layered structure of a lithium ion battery, and belongs to the technical field of energy materials. Background technique [0002] In the 1990s, Sony Corporation of Japan successfully developed a lithium-ion secondary battery and realized its commercial production. The emergence of lithium batteries has achieved a qualitative leap in the history of secondary battery development. Lithium-ion battery is considered as an ideal power source because of its outstanding advantages such as high energy density, light weight, no memory effect, high working voltage and stable performance, environmental protection and pollution-free, long service life, safety and reliability. It is precisely because of the above advantages that the research and industrialization of lithium-ion have flourished, and its global sales have exceeded the total amount of nickel-metal hyd...

AI Technical Summary

Problems solved by technology

[0006] Regrettably, most researchers have used ammonia water with a strong pungent smell as a complexing agent, which will cause a lot of environmental pollution and is also harmful to the health of operators

In addition, in the later stage of waste liquid treatment, special equipment for treating ammonia must be used, which not only increases production costs, but also is not conducive to environmental protection, and does not meet the national policy requirements of low energy consumption and high output

Now, only a few documents and patents use EDTA, tartaric acid or citric acid as a complexing agent to synthesize precursors, but their electrochemical properties are not very good

In addition, due to the strong corrosiveness of the reagent, it also caused great damage to the equipment.

There are also domestic patents using amino acid organic compounds as complexing agents. Although it solves the environmental protection problem, it undoubtedly increases the production cost, and the charge and discharge performance is average.

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