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Ternary precursor with core-shell structure and preparation method and application thereof

A core-shell structure and precursor technology, applied in structural parts, chemical instruments and methods, electrical components, etc., can solve product S content control, specific surface area and production cost constraints, affect the electrochemical performance of ternary materials, and process stability Poor properties and other problems, to avoid low tap density, excellent electrochemical performance, improve sphericity and specific surface area

Active Publication Date: 2021-09-24
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this process is that it is relatively easy to control the particle size, shape and tap density of the precursor, but the S content control, specific surface area and production cost of the product are greatly limited.
At present, the main problems in the preparation of ternary hydroxide precursors by carbonate co-precipitation technology are: the process stability is poor, the content of impurities (Na) is higher than that of hydroxide precursors, and the tap density is low, which affects the ternary hydroxide precursors. Electrochemical properties of metamaterials

Method used

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  • Ternary precursor with core-shell structure and preparation method and application thereof
  • Ternary precursor with core-shell structure and preparation method and application thereof
  • Ternary precursor with core-shell structure and preparation method and application thereof

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preparation example Construction

[0051] According to one aspect of the present invention, the present invention relates to a method for preparing a ternary precursor of a core-shell structure, comprising the following steps:

[0052] (a) The mixture of the first mixed salt, the first precipitating agent, the first complexing agent and the first bottom liquid undergoes a co-precipitation reaction to obtain the inner core of the ternary precursor;

[0053] (b) The inner core of the ternary precursor and the mixture of the second mixed salt, the second precipitating agent, the second complexing agent and the second bottom liquid carry out a co-precipitation reaction;

[0054] The D50 particle size of the core of the ternary precursor is 30% to 50% of the D50 particle size of the ternary precursor with the core-shell structure;

[0055] The first mixed salt is nickel salt, cobalt salt and manganese salt;

[0056] The second mixed salt is nickel salt, cobalt salt and manganese salt;

[0057] The first precipitat...

Embodiment 1

[0109] A preparation method of a ternary precursor of a core-shell structure, comprising the following steps:

[0110] (a) Prepare a sulfate solution with a nickel, cobalt, and manganese molar ratio of 6:1:3, the sum of the concentrations of nickel ions, cobalt ions, and manganese ions is 1.5mol / L; prepare sodium hydroxide with a concentration of 12mol / L solution; prepare an ammonia solution with a concentration of 5mol / L; add a special reaction bottom liquid to the reaction kettle in advance, the reaction bottom liquid is sodium hydroxide and ammonia solution, and the pH is 11.5, and the ammonium root concentration is 5g / L;

[0111] (b) Put the above nickel, cobalt, manganese sulfate solution, sodium hydroxide and ammonia solution into the reaction kettle in parallel, the temperature is controlled at 60°C, the pH is controlled at 11.50, the ammonium root concentration is 5g / L, and the rotation speed is 200r / min, the whole reaction is carried out under nitrogen protection; wh...

Embodiment 2

[0117] A preparation method of a ternary precursor of a core-shell structure, comprising the following steps:

[0118] (a) Prepare a sulfate solution with a nickel, cobalt, and manganese molar ratio of 6:1:3, the sum of the concentrations of nickel ions, cobalt ions, and manganese ions is 5mol / L; prepare a sodium hydroxide solution with a concentration of 12mol / L ; Prepare an ammonia solution with a concentration of 5mol / L; add a special reaction bottom solution to the reaction kettle in advance, the reaction bottom solution is sodium hydroxide and ammonia solution, and the pH is 11.5, and the ammonium root concentration is 9g / L;

[0119] (b) Put the above-mentioned sulfate solution of nickel, cobalt and manganese, sodium hydroxide and ammonia solution into the reaction kettle; the temperature is controlled at 60°C, the pH is controlled at 11.50, the rotating speed is 200r / min, and the whole reaction is under nitrogen protection Carry out below; Wherein, the ratio of the amoun...

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Abstract

The invention relates to the technical field of ternary precursor materials, in particular to a ternary precursor with a core-shell structure and a preparation method and application thereof. The ternary precursor with the core-shell structure is prepared by taking hydroxide precipitates of nickel, cobalt and manganese as a core and carbonate precipitates as a shell; the hydroxides of nickel salt, cobalt salt and manganese salt are taken as cores, and carbonate precipitation reaction is carried out on the basis, so that the problem of uncontrollable granularity caused by poor early-stage process stability of single carbonate can be effectively avoided; in addition, by controlling the particle size of the inner core, the problem of low tap density of a single carbonate precursor can be effectively avoided; and the outer carbonate can effectively improve the sphericity and the specific surface area of the material. The obtained ternary precursor with the core-shell structure is good in sphericity degree, large in specific surface area and low in S content.

Description

technical field [0001] The present invention relates to the technical field of ternary precursor materials, in particular to a ternary precursor with a core-shell structure and its preparation method and application. Background technique [0002] At present, mainstream NCM ternary cathode materials use hydroxide co-precipitation technology to synthesize precursors uniformly mixed at the atomic level. Sodium hydroxide is used as a precipitating agent and ammonia water is used as a complexing agent to produce high-density spherical hydroxide precursors. The advantage of this process is that it is relatively easy to control the particle size, shape and tap density of the precursor, but the control of S content, specific surface area and production cost of the product are greatly limited. At present, the main problems in the preparation of ternary hydroxide precursors by carbonate co-precipitation technology are: the process stability is poor, the content of impurities (Na) is h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2004/61Y02E60/10
Inventor 黄仁忠高琦吴浩郑江峰张晨
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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