A kind of preparation method of quasi-single crystal nickel cobalt manganese oxide lithium

A technology of nickel-cobalt-manganese lithium manganese oxide and nickel-cobalt-manganese oxide, which is applied in the field of preparation of quasi-single crystal nickel-cobalt manganese oxide lithium, can solve the problems of reducing compaction density, material electrical performance degradation, coating dead angle, etc., and achieves kinetic energy utilization efficiency The effect of improving, improving order and avoiding reunion

Active Publication Date: 2022-04-26
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the ternary cathode materials produced by domestic and foreign manufacturers are secondary spherical particles agglomerated by fine grains (that is, primary particles), which have the following disadvantages: 1. There are voids inside the particles, which reduces the compaction density; 2. The particles The size is too large, the structure is unstable and not pressure-resistant, and it is easy to break, resulting in poor circulation; 3. The particle grows disorderly inside, and the rate performance of the material is low
[0005] First: The small particle size has strict requirements on the reaction conditions in the synthesis process. If the particle size is too small, the specific surface area will be larger, resulting in the agglomeration of the precursor particles, resulting in an increase in internal voids due to poor sphericity, and the subsequent calcination process will cause the finished product to be too large. Too wide, and the growth time of small particle size is relatively short, and the crystallinity and order of the precursor are poor
[0006] Second: Due to the large specific surface area of ​​the small-particle precursor prepared by conventional methods, its surface energy is greater than that of the large-particle precursor, so agglomeration will occur before sintering, and the particles of the agglomerated precursor will appear spliced ​​after sintering appearance, and due to the enlarged particle size distribution due to agglomeration, in the subsequent process such as coating, there will be coating dead ends, and the particle consistency is poor
And because the particle strength of the particles produced after agglomeration is not as high as that of the precursor particles grown in situ, it will be crushed in the subsequent application process of preparing the battery, such as in the rolling step, exposing the non-coated interface, which is not coated The surface of the coated particles will have a side reaction with the electrolyte, which will cause serious consequences such as battery bulging, which greatly reduces the cycle stability of the material
[0007] Third: The growth time of small particles synthesized by conventional methods is shorter than that of large particles, and the crystalline order of the crystal structure of small particles is weaker than that of large particles. When the crystallinity of the precursor is low, the positive electrode material produced after high temperature lithiation There will also be corresponding inheritance, and the generation of impurity phases may cause the deterioration of the electrical properties of the material, which will affect the performance of the material

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  • A kind of preparation method of quasi-single crystal nickel cobalt manganese oxide lithium
  • A kind of preparation method of quasi-single crystal nickel cobalt manganese oxide lithium
  • A kind of preparation method of quasi-single crystal nickel cobalt manganese oxide lithium

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preparation example Construction

[0083] In some embodiments, the preparation method of the single-crystal nickel-cobalt-lithium manganate-like positive electrode material includes:

[0084] Step 1: Solution Preparation

[0085] disposing the soluble metal salts of nickel, cobalt and manganese into a transition metal salt solution with a total molar concentration of nickel, cobalt and manganese of 1-2mol / L;

[0086] Adding a complexing agent to the transition metal salt solution prepared above to obtain a transition metal salt solution added with a complexing agent;

[0087] The electrolyte and the inorganic base are prepared into a regulating solution with a pH value of 13-14;

[0088] The second step: preparation of nickel-cobalt-manganese metal precipitate

[0089]The various solutions prepared in the first step are continuously pumped into the three-port reaction kettle through different feeding pipes at the same time. When feeding, ensure that the feeding position of the feeding pipe in the kettle is at...

Embodiment 1-4

[0107] In Examples 1-4, the shielding gas flow rate in the second step is different, and other operating steps are the same. The protective gas flow rate in Example 1 is 1mL / min, the protective gas flow rate in Example 2 is 5mL / min, the protective gas flow rate in Example 3 is 10mL / min, and the protective gas flow rate in Example 4 is 20mL / min, see Table 1.

[0108] The concrete experimental operation of each embodiment is:

[0109] Step 1: Solution Preparation

[0110] Weigh 9.6 mol of nickel nitrate hexahydrate, 0.2 mol of cobalt acetate tetrahydrate, and 0.2 mol of manganese sulfate monohydrate into the container, add an appropriate amount of water to make the total volume of the solution 5 L, and obtain a salt solution with a total transition metal concentration of 2 mol / L;

[0111] Weigh 5mol ammonium sulfate as a complexing agent, and add it to the above-mentioned configured salt solution to obtain a transition metal salt solution with complexing agent added;

[0112] ...

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Abstract

The invention provides a method for preparing a quasi-single crystal nickel-cobalt lithium manganese oxide, comprising: the first step: preparing a transition metal salt solution, adding a complexing agent or preparing a complexing agent solution, and preparing a pH adjustment solution; the second step: preparing Nickel-cobalt-manganese metal deposits: the various solutions prepared in the first step are continuously pumped into the reactor through different feeding pipes at the same time, the reactor with the manganese salt is connected to the feed port of the reactor, and Pass protective gas, heat, continuously add oxidant in the reactor, react, adjust the flow rate of protective gas, bring the manganese oxide generated by the reaction into the reaction kettle, control the pH value in the reaction kettle to carry out the precipitation reaction, after the reaction is completed The nickel-cobalt-manganese metal precipitate is obtained; the third step is pre-sintering to prepare a nickel-cobalt-manganese precursor; the fourth step is lithiation sintering to obtain a single crystal-like nickel-cobalt-manganese lithium manganese cathode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery anode materials, in particular to a method for preparing a quasi-single crystal nickel-cobalt lithium manganese oxide. Background technique [0002] At present, the cathode materials that have been industrialized mainly include LiCoO2, LiFePO4, Li2MnO4 and ternary cathode materials. Among them, nickel-cobalt-manganese ternary materials are one of the hotspots in the research of a new generation of lithium-ion ternary cathode materials. However, at present, the ternary cathode materials produced by domestic and foreign manufacturers are secondary spherical particles agglomerated by fine grains (that is, primary particles), which have the following disadvantages: 1. There are voids inside the particles, which reduces the compaction density; 2. The particles If the size is too large, the structure is unstable and cannot withstand pressure, and it is easy to break, resulting in poor circu...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525H01M4/36
CPCH01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525H01M4/366Y02E60/10
Inventor胡文理何凤荣胡骐朱佳兵刘俊文陈祥斌陈璐陈海轮
OwnerDONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD