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Preparation method of nickel-cobalt-manganese precursor particles

A precursor, nickel-cobalt-manganese technology, which is used in the preparation of nickel-cobalt-manganese precursor particles and the preparation of nickel-cobalt-manganese precursor particles by liquid phase gradient doping can solve the problem of reducing product stability, backward doping methods, and doping Element enrichment and other issues, to achieve the effect of eliminating doping element enrichment, ensuring uniform gradient distribution, and controllable reaction process

Active Publication Date: 2019-08-30
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The doping method of this invention is backward
Moreover, simple impregnation is difficult to make the dopant elements distributed in a gradient in the precursor particles
At the same time, this method can only wrap the doping elements on the surface of the ternary precursor particles in a permeable manner, which is easy to cause the enrichment of the doping elements on the surface of the ternary precursor particles
[0006] It can be seen that the existing technology mainly adopts the method of doping elements by solid-phase method in the process of preparing lithium salts, which will cause local enrichment of doping elements, interfere with the uniformity of product particles, and reduce product stability. properties, thereby improving the material capacitance to a certain extent

Method used

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  • Preparation method of nickel-cobalt-manganese precursor particles
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  • Preparation method of nickel-cobalt-manganese precursor particles

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preparation example Construction

[0046] The embodiment of the present invention proposes a method for preparing nickel-cobalt-manganese precursor particles, including the following steps:

[0047] Step 1: soluble nickel salt, soluble cobalt salt, soluble manganese salt and soluble salt doped with metal T are formulated into nickel-cobalt solution, nickel-manganese solution and nickel-T solution; the concentration of the nickel-cobalt solution is greater than that of the nickel-manganese solution, The concentration of the nickel manganese solution is greater than the nickel T solution;

[0048] Step 2: After mixing the nickel-cobalt solution and the nickel-manganese solution, add a complexing agent, adjust the pH value of the solution to 9-11.5, then add the nickel T solution, and react under an inert atmosphere to obtain the nickel-cobalt-manganese precursor particles .

[0049] The particle size characterization instrument of the nickel-cobalt-manganese precursor particles is a laser particle size analyzer....

Embodiment 1

[0057] Nickel sulfate is made into nickel-cobalt sulfate solution, nickel-manganese sulfate solution and nickel-aluminum sulfate solution in proportion with cobalt sulfate, manganese sulfate and aluminum sulfate respectively; Wherein the concentration of nickel-cobalt sulfate solution is 50g / L, the concentration of nickel sulfate and cobalt sulfate The mass ratio is 5:0.6; the concentration of nickel-manganese sulfate solution is 32g / L, and the mass ratio of nickel sulfate and manganese sulfate is 2.5:0.4; the concentration of nickel-aluminum sulfate solution is 6g / L, and the mass ratio of nickel sulfate and aluminum sulfate is 0.5:0.007.

[0058] The nickel-cobalt sulfate solution was added to the reactor with a flow rate of 350L / h and the nickel-manganese sulfate solution was added to the reactor with a flow rate of 280L / h, and then the pyridinium propanesulfonate solution with a concentration of 9g / L was added at a flow rate of 10L / h. A sodium hydroxide solution with a conc...

Embodiment 2

[0064] Nickel sulfate is made into nickel-cobalt sulfate solution, nickel-manganese sulfate solution and nickel-aluminum sulfate solution in proportion with cobalt sulfate, manganese sulfate and aluminum sulfate respectively; Wherein the concentration of nickel-cobalt sulfate solution is 50g / L, the concentration of nickel sulfate and cobalt sulfate The mass ratio is 5:0.6; the concentration of nickel manganese sulfate solution is 32g / L, the mass ratio of nickel sulfate to manganese sulfate is 2.5:0.4; the concentration of nickel aluminum sulfate solution is 6g / L, the mass ratio of nickel sulfate to aluminum sulfate is 0.5:0.007.

[0065] The nickel-cobalt sulfate solution was added to the reactor with a flow rate of 350L / h and the nickel-manganese sulfate solution was added to the reactor with a flow rate of 280L / h, and then the pyridinium propanesulfonate solution with a concentration of 1g / L was added at a flow rate of 10L / h. A sodium hydroxide solution with a concentration ...

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Abstract

The invention relates to a preparation method of a nickel-cobalt-manganese precursor, which specifically includes the following steps: preparing nickel-cobalt solution, nickel-manganese solution and nickel-T solution by mixing soluble nickel salt with soluble cobalt salt, soluble manganese salt and soluble salt doped with metal T respectively, wherein the concentration of the nickel-cobalt solution is higher than that of the nickel-manganese solution, and the concentration of the nickel-manganese solution is higher than that of the nickel-T solution; mixing the nickel-cobalt solution with thenickel-manganese solution and adding a complexing agent to obtain a mixed solution, and adjusting the pH value of the mixed solution to 9-11.5 by adding alkali solution; and adding the nickel-T solution to the mixed solution for reaction in an inert atmosphere to obtain nickel-cobalt-manganese precursor particles with uniform size, high purity and stable chemical performance. The prepared nickel-cobalt-manganese precursor particles show a gradient decrease in the relative content of nickel element and a gradient increase in the relative content of doped element from the core to the surface.

Description

technical field [0001] The invention relates to a method for preparing nickel-cobalt-manganese precursor particles, in particular to a method for preparing nickel-cobalt-manganese precursor particles by liquid-phase gradient doping, and belongs to the field of preparation of positive electrode materials for lithium batteries. Background technique [0002] Ternary cathode materials generally have the problem of poor structural stability. A large number of studies have proved that element doping on the surface of ternary cathode materials can effectively isolate the electrolyte from the active material without excessively reducing the electrochemical performance of the material. Avoid side reactions between the two and improve the stability of the material. [0003] At the same time, the cycle performance of the ternary cathode material can be greatly improved by element doping, thereby improving the battery life of the lithium-ion battery. [0004] Chinese patent application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/006H01M4/04H01M4/362H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 罗钢徐祥
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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