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A core-shell structure high-nickel ternary precursor and its preparation method, and a hollow-doped high-nickel ternary positive electrode material

A core-shell structure and precursor technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor conductivity, unstable cycle structure, and low initial capacity of high-nickel NCM, and achieve improved internal structure and easy design. Assembly and structural regulation, and the effect of improving cycling stability

Active Publication Date: 2021-02-12
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a high-nickel ternary precursor with a core-shell structure, which overcomes the problems of high-nickel NCM with poor conductivity, unstable cycle structure, and low initial capacity.

Method used

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  • A core-shell structure high-nickel ternary precursor and its preparation method, and a hollow-doped high-nickel ternary positive electrode material
  • A core-shell structure high-nickel ternary precursor and its preparation method, and a hollow-doped high-nickel ternary positive electrode material
  • A core-shell structure high-nickel ternary precursor and its preparation method, and a hollow-doped high-nickel ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation of a high-nickel ternary precursor with a core-shell structure includes the following steps:

[0043] (1) The concentration of zinc nitrate is adjusted and controlled at 2mol / L; the concentration of 2-methylimidazole is adjusted and controlled at 4mol / L;

[0044] (2) Slowly add the uniformly stirred metal salt solution into the 2-methylimidazole solution, stir for 30min, and let stand for 24h;

[0045] (3) The Zn-MOF was washed by centrifugation, dried at 80°C for 8 hours, and then soaked in 0.1mol / L boric acid solution for 6 hours;

[0046] (4) Industrial 28% ammonia water is mixed with deionized water and the concentration is adjusted to be 10mol / L; NaOH is mixed with deionized water to adjust the concentration to be 4mol / L;

[0047] (5) dissolving soluble nickel nitrate, cobalt nitrate, and manganese nitrate with a molar ratio of Ni:Co:Mn=7:2:1 and a total concentration of 2mol / L in hot water at 70°C, and stirring until completely dissolved;

[0048...

Embodiment 2

[0058] The preparation of a high-nickel ternary precursor with a core-shell structure includes the following steps:

[0059] (1) The concentration of zinc nitrate is adjusted and controlled at 2mol / L; the concentration of 2-methylimidazole is adjusted and controlled at 4mol / L;

[0060] (2) Slowly add the uniformly stirred metal salt solution into the 2-methylimidazole solution, stir for 30min, and let stand for 24h;

[0061] (3) The Zn-MOF was washed by centrifugation, dried at 80°C for 12h, and then soaked in 0.05mol / L boric acid solution for 10h;

[0062] (4) Industrial 28% ammonia water is mixed with deionized water and the concentration is adjusted to be 10mol / L; NaOH is mixed with deionized water to adjust the concentration to be 4mol / L;

[0063] (5) dissolving soluble nickel nitrate, cobalt nitrate, and manganese nitrate with a molar ratio of Ni:Co:Mn=6:2:2 and a total concentration of 2mol / L in hot water at 70°C, and stirring until completely dissolved;

[0064] (6) P...

Embodiment 3

[0069] The preparation of a high-nickel ternary precursor with a core-shell structure includes the following steps:

[0070] (1) The concentration of zinc nitrate is adjusted and controlled at 1.5mol / L; the concentration of 2-methylimidazole is adjusted and controlled at 3mol / L;

[0071] (2) Slowly add the uniformly stirred metal salt solution into the 2-methylimidazole solution, stir for 15 minutes, and let stand for 20 hours;

[0072] (3) The Zn-MOF was washed by centrifugation, dried at 100°C for 6h, and then soaked in 0.02mol / L boric acid solution for 24h

[0073] (4) Industrial 28% ammonia water is mixed with deionized water and the concentration is adjusted to be 10mol / L; NaOH is mixed with deionized water to adjust the concentration to be 4mol / L;

[0074] (5) dissolving soluble nickel sulfate, cobalt sulfate, and manganese sulfate with a molar ratio of Ni:Co:Mn=8:1:1 and a total concentration of 2mol / L in hot water at 70°C, and stirring until completely dissolved;

[...

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Abstract

The invention relates to the field of lithium-ion battery materials, in particular to a core-shell structure high-nickel ternary precursor and a preparation method thereof, and a hollow-doped high-nickel ternary positive electrode material. The precursor is a core-shell structure, the inner core is a boron-doped octahedral structure Zn-MOF, and the outer shell is a nickel-rich ternary precursor Ni x co y mn z (OH) 2 . The preparation method is synthesized in two steps. The first step is to synthesize an octahedral structure Zn-MOF (metal organic framework) by co-precipitation, and soak it in a boric acid solution to obtain a boron-doped MOF; the second step is based on this Coating the high-nickel ternary precursor material to form a high-nickel ternary precursor with a core-shell structure. The invention adopts a simple and efficient method to prepare a high-nickel ternary precursor with a core-shell structure, which lays the foundation for the later-prepared positive electrode material to have higher initial capacity and cycle stability; the composition of the product synthesized by the co-precipitation method is uniform , good sphericity, good reproducibility, good economic value and application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a core-shell structure high-nickel ternary precursor and a preparation method thereof, and a hollow-doped high-nickel ternary positive electrode material. Background technique [0002] Lithium-ion batteries (LIBs) with high energy and power density have been widely used in energy storage systems. Electrode materials provided for EVs or HEVs need to fully balance five basic factors: energy density, power density, cost, lifetime, and safety. Nickel-rich (Ni content gradually increases from x=0.33 to x=0.85 and even higher) layered ternary cathode material LiNi with high capacity and high energy density x co y mn 1-x-y o 2 (NCM) and LiNi x co y Al 1-x-y o 2 (NCA) has become a very representative material in commercialization. However, detrimental phase transitions inside high-nickel materials can lead to structural instability, as well as surface-active Ni in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张宝王振宇
Owner ZHUJI PAWA NEW ENERGY
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