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Ternary material precursor with nickel element in gradient distribution, and preparation method and application thereof

A ternary material, gradient distribution technology, applied in the field of materials, can solve the problem of the gradual disappearance of element gradient distribution, inconspicuousness, and inability to control the gradient distribution well, achieving good cycle stability, excellent rate performance, and safety performance. boosted effect

Inactive Publication Date: 2020-11-24
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The gradient distribution of material elements produced by these schemes is often not well controlled and the gradient distribution is not obvious, and the element gradient distribution often disappears slowly after the material is charged and discharged for the first time.
[0004] Therefore, the existing ternary material precursors with gradient distribution of nickel elements need to be improved

Method used

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  • Ternary material precursor with nickel element in gradient distribution, and preparation method and application thereof
  • Ternary material precursor with nickel element in gradient distribution, and preparation method and application thereof
  • Ternary material precursor with nickel element in gradient distribution, and preparation method and application thereof

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preparation example Construction

[0061] According to the method for preparing a ternary material precursor with a gradient distribution of nickel elements according to an embodiment of the present invention, by mixing cellulose xanthate particles with a solution containing aluminum ions, the aluminum ions are coated on the surface of the cellulose xanthate particles On the surface, the cellulose xanthate particles coated with aluminum ions are obtained. Add mixed salt containing nickel, cobalt and manganese at this time, because the surface of cellulose xanthate particles contains positively charged aluminum ions, thus nickel, cobalt and manganese ions will gather with cellulose xanthate as the center, because cellulose xanthate The lipid has a strong adsorption effect on nickel ions, so that the nickel ions in the nickel-cobalt-manganese salt gather at the periphery of the cellulose xanthate particles in the inner core, and along the center away from the inner core, the concentration of nickel ions in the sub...

Embodiment 1

[0069] The method for preparing the ternary material with nickel element gradient distribution comprises the following steps:

[0070] (1) Dissolve the cellulose xanthate powder in the aqueous solution containing aluminum ions and mix evenly (the ratio of cellulose xanthate and the aqueous solution containing aluminum ions is 30g: 700mL, and the concentration of the aqueous solution containing aluminum ions 8wt%), the solution was dried in an inert gas environment, and the resulting precipitate was pulverized for nano-processing, and the particle size of the cellulose xanthate particles after nano-processing was 60nm;

[0071] (2) Add a mixed solution of nickel-cobalt-manganese salt and ammonia water to the particles of nano-sized cellulose xanthate whose surface is coated with aluminum ions obtained in step (1) and mix evenly, and react for 12 to 15 hours, wherein the surface is coated with aluminum ions The mass ratio of nanoscale cellulose xanthate particles to the mixed sa...

Embodiment 2

[0075] The method for preparing the ternary material with nickel element gradient distribution comprises the following steps:

[0076] (1) Dissolve the cellulose xanthate powder in the aqueous solution containing aluminum ions and mix evenly (the ratio of cellulose xanthate and the aqueous solution containing aluminum ions is 40g: 700ml, and the concentration of the aqueous solution containing aluminum ions 8wt%), the solution is dried in an inert gas environment, and the resulting precipitate is pulverized for nano-processing, and the particle size of the cellulose xanthate particles after nano-processing is 50nm;

[0077] (2) Add a mixed solution of nickel-cobalt-manganese salt and ammonia water to the particles of nano-sized cellulose xanthate whose surface is coated with aluminum ions obtained in step (1) and mix evenly, and react for 12 to 15 hours, wherein the surface is coated with aluminum ions The mass ratio of nanoscale cellulose xanthate particles to the mixed salt ...

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Abstract

The invention discloses a ternary material precursor with a nickel element in gradient distribution, and a preparation method and application thereof. The ternary material precursor with nickel elements in gradient distribution comprises an inner core, a secondary outer layer and an outermost layer, wherein the inner core comprises cellulose xanthate particles; the secondary outer layer is arranged on the surface of the inner core, and the content of the nickel element in the secondary outer layer is sequentially reduced in a direction away from the inner core; and the outermost layer is arranged on the surface of the secondary outer layer, and the outermost layer comprises a manganese element and a cobalt element. A battery prepared from the ternary material precursor is good in cycling stability and excellent in high-temperature performance, the safety performance is improved, meanwhile, the nano xanthate does not participate in a charge-discharge reaction in the ternary material precursor, and the rate capability similar to that of a hollow ternary material precursor is excellent.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a ternary material precursor with a gradient distribution of nickel elements and a preparation method and application thereof. Background technique [0002] Nickel-cobalt-lithium manganese oxide ternary material (NMC) is a major research hotspot in lithium-ion batteries. It has the advantages of high specific capacity, good thermal stability, good cycle performance, good safety and low cost. It is an ideal lithium battery. Cathode material for ion batteries. However, the nickel element in the ternary material affects the safety and cycle performance of the material, and it is not as stable as cobalt and manganese. Make a ternary material with a gradient distribution of nickel elements, make the nickel element close to the center of the particle, and let the safe and stable cobalt and manganese elements be in the outer layer of the particle, so that the material can avoid the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/525H01M4/505H01M4/04H01M4/1391H01M4/131H01M10/0525
CPCH01M4/0471H01M4/049H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 何欢吕豪杰齐士博
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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