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Preparation method of nickel-cobalt-manganese ternary precursor material

A nickel-cobalt-manganese and precursor technology, applied in the field of lithium-ion battery preparation, can solve problems such as ball cracking, poor performance of positive electrode materials, uneven particles, etc., and achieve high economic practicability, controllable and easy-to-operate equipment and related conditions Effect

Inactive Publication Date: 2019-12-03
ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the characteristics of the ammonia complexing agent in the traditional method, when preparing large particles, especially high-nickel large particle products, it is easy to cause ball cracks and uneven particles, which in turn leads to poor performance of subsequent positive electrode materials

Method used

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  • Preparation method of nickel-cobalt-manganese ternary precursor material

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Embodiment 1

[0032] This embodiment provides a method for preparing a nickel-cobalt-manganese ternary precursor, comprising the following steps:

[0033] According to the ratio of 8:1:1, prepare NiSO with a concentration of 1.6mol / L 4 、CoSO 4 , MnSO 4 Mixed solution, and add sodium salicylate to prepare a mixed solution with a molar concentration of sodium salicylate of 0.05mol / L, use a metering pump to flow the mixed solution and 10mol / L lye into the reactor, the first stage, the reactor The stirring speed is 1000r / min, the pH is 11.60, and the temperature is 50°C; in the second stage, after the particle D50≥3μm is measured by Malvern 2000, 0.5mol / L ammonia water is introduced to control the ammonia value in the reactor at 6~ 7. The pH is 10.50. The two-stage process is concentrated with a concentrator to increase the solid content. The particle D50 ≥ 5 μm is measured by Malvern 2000 to stop the reaction; the slurry is aged, washed, dried, mixed, sieved, and removed After iron, the pre...

Embodiment 2

[0036] This embodiment provides a method for preparing a nickel-cobalt-manganese ternary precursor, comprising the following steps:

[0037] According to the ratio of 5:2:3, prepare NiSO with a concentration of 1.6mol / L 4 、CoSO 4 , MnSO 4 Mixed solution, and add sodium salicylate to prepare a mixed solution with a molar concentration of sodium salicylate of 0.05mol / L, use a metering pump to flow the mixed solution and 10mol / L lye into the reactor, the first stage, the reactor The stirring speed is 1100r / min, the pH is 11.60, and the temperature is 50°C; in the second stage, after the particle D50≥3μm is measured by Malvern 2000, 0.5mol / L ammonia water is introduced to control the ammonia value in the reactor at 6~ 7. The pH is 10.50. The two-stage process is concentrated with a concentrator to increase the solid content. The particle D50 ≥ 5 μm is measured by Malvern 2000 to stop the reaction; the slurry is aged, washed, dried, mixed, sieved, and removed After iron, the pre...

Embodiment 3

[0040] This embodiment provides a method for preparing a nickel-cobalt-manganese ternary precursor, comprising the following steps:

[0041] According to the ratio of 8:1:1, prepare NiSO with a concentration of 1.6mol / L 4 、CoSO 4 , MnSO 4 Mixed solution, and add sodium salicylate to prepare a mixed solution with a molar concentration of sodium salicylate of 0.1mol / L, use a metering pump to flow the mixed solution and 10mol / L lye into the reactor, the first stage, the reactor The stirring speed is 1000r / min, the pH is 11.60, and the temperature is 45°C; in the second stage, after the particle D50≥3μm is measured by Malvern 2000, 0.5mol / L ammonia water is introduced to control the ammonia value in the reactor at 6~ 7. The pH is 10.50. The two-stage process is concentrated with a concentrator to increase the solid content. The particle D50 ≥ 5 μm is measured by Malvern 2000 to stop the reaction; the slurry is aged, washed, dried, mixed, sieved, and removed After iron, the prec...

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Abstract

The invention belongs to the technical field of lithium ion battery preparation, and particularly relates to a preparation method of a nickel-cobalt-manganese ternary precursor material. The method comprises the following steps of: (1) preparing a nickel-cobalt-manganese salt solution with a certain concentration by using soluble salts nickel sulfate, manganese sulfate and cobalt sulfate as raw materials; (2) adding sodium salicylate into the prepared nickel-cobalt-manganese solution according to a certain proportion to form a mixed solution, then adding alkali liquor as a precipitator, and carrying out coprecipitation reaction to obtain mixed slurry; (3) dividing the coprecipitation reaction into two stages, namely a high-pH nucleation stage and a low-pH growth stage, wherein a complexingagent in a certain proportion is added in the low-pH growth stage for the precipitation reaction, and a concentrator is used for increasing the solid content in the whole coprecipitation reaction process; and (4) finally, aging, washing and drying the obtained product to obtain the nickel-cobalt-manganese precursor. By adopting the preparation method disclosed by the invention, the nickel-cobalt-manganese precursor with a high sphericity degree and a compact surface can be obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, in particular to a preparation method of a nickel-cobalt-manganese ternary precursor material. Background technique [0002] In recent years, all kinds of new energy vehicle power technologies have developed rapidly and competed with each other. Represented by electric drive, a new process change has been stimulated. At present, most of the power sources used by electric vehicles on the market are lithium power batteries. Lithium batteries are generally recognized by enterprises and users for their high energy density, long life and high safety. At present, the mainstream lithium-ion batteries on the market include lithium iron phosphate, lithium nickel-cobalt manganese oxide, etc. Among them, the advantages of high energy density of nickel-cobalt lithium manganese oxide, a ternary material, have attracted extensive research. The performance of ternary materials is mainly...

Claims

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Application Information

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IPC IPC(8): H01M4/50H01M4/52H01M10/0525
CPCH01M4/502H01M4/523H01M10/0525Y02E60/10
Inventor 许益伟吉同棕周浩王明余凡毛秦钟王寅峰钱志挺吴海军
Owner ZHEJIANG MEIDU HITRANS LITHIUM BATTERY TECHNOLOGY CO LTD
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