Nickel cobalt lithium manganate material and preparation method thereof

Abstract

The invention relates to a preparation method of a nickel cobalt lithium manganate material. Soluble nickel, cobalt and manganese salts are used as raw materials; a coprecipitation reaction technology is used. The method is characterized in that the molecular formula of nickel cobalt lithium manganate is LiNixCoyMnzO2; the preparation comprises the following concrete process steps that (1) a nickel cobalt and manganese precursor is prepared through coprecipitation reaction; water is added into a reaction kettle device, so that nickel sulfate, cobalt sulfate and manganese sulfate are prepared into a mixed water solution; a sodium hydroxide water solution is added as a precipitant; ammonium hydroxide is added; the coprecipitation reaction is performed under the existence of heating and protection gas; filtering is performed to obtain filtrate and filter residue; the filter residue is cleaned to prepare a nickel cobalt and manganese hydroxide precursor; (2) reaction is performed to prepare a nickel cobalt lithium manganate product; the prepared nickel cobalt and manganese hydroxide precursor is baked and dried, and is then sieved to be fully stirred and mixed with lithium salts into a nickel cobalt and manganese hydroxide precursor and lithium salt mixture; the nickel cobalt and manganese hydroxide precursor and lithium salt mixture is loaded into an earthen bowl; high-temperature firing, crushing, sieving, mixing, sieving and iron removal are performed; packaging is performed to prepare the nickel cobalt lithium manganate material. A lithium ion battery manufactured by the prepared nickel cobalt lithium manganate product has the advantages of excellent safety performance, high-temperature performance and long cycle life.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a nickel-cobalt lithium manganese oxide material and a preparation method thereof. Background technique [0002] As a new type of green battery, lithium-ion batteries are widely used in wireless communication, transportation, aerospace and other aspects. Lithium-ion batteries are mainly composed of positive electrode materials such as lithium-intercalated transition metal oxides, negative electrode materials such as highly graphitized carbon , Diaphragm such as polyolefin microporous membrane and electrolyte materials. The lithium-ion cathode material is a crucial factor restricting the performance of lithium-ion batteries in all aspects. [0003] Lithium-ion battery cathode material is one of the key materials in lithium-ion batteries, and its performance will directly affect the performance of the entire lithium-ion battery. ...

AI Technical Summary

Problems solved by technology

[0005] However, there are many compounds added in the above method, the reaction process steps are too long, and the reaction process cannot be automatically controlled.

Manual operation is labor-intensive, and the reaction process is not easy to control

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