Monocrystal ternary positive electrode material as well as preparation method and application thereof

A positive electrode material and single crystal technology, applied in the field of single crystal ternary positive electrode materials and their preparation, can solve the problems of high content of doping elements, increased DCR, low material capacity, etc., and achieve high energy density, low residual lithium on the surface, Reduce the effect of surface side reactions

Pending Publication Date: 2022-03-25
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under high voltage, in order to maintain the stable structure of the material, the content of doping elements is a bit high, too much doping, the material structure is stable, but the capacity of the material will be a bit low
The coating of the material and large particles will increase the DCR of the material, especially in the case of low discharge potential, it is difficult for lithium ions in the electrolyte to enter the lattice of the positive electrode material, resulting in low material capacity and poor cycle

Method used

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  • Monocrystal ternary positive electrode material as well as preparation method and application thereof
  • Monocrystal ternary positive electrode material as well as preparation method and application thereof
  • Monocrystal ternary positive electrode material as well as preparation method and application thereof

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Embodiment 1

[0054] The single crystal ternary cathode material of the present embodiment has a chemical formula of LiNi 0.596 co 0.05 mn 0.35 m 0.004 o 2 @Li 2 NO 4 ; where M is Zr and W; N is Zr, Al and W; the average particle size of single crystal particles is 1.5-3μm, and the specific surface area is 0.4-0.8cm 2 / g.

[0055] The preparation method of the single crystal ternary cathode material of this embodiment, the specific steps are as follows:

[0056] (1) NiSO 4 、CoSO 4 , MnSO 4 According to the Ni:Co:Mn molar ratio of 0.60:0.05:0.35, a mixed solution with a total metal ion concentration of 1.6mol / L was prepared, and then a 10mol / L NaOH solution was prepared;

[0057] (2) Pass the mixed solution into the reactor, then feed the NaOH solution and the ammonia solution into the reactor and stir for 70 hours, adjust the reaction temperature to 70°C, and the stirring speed to 500r / min, and keep the pH in the reactor at 9.5-12.0, filter, wash with water, and vacuum-dry at 120...

Embodiment 2

[0065] The single crystal ternary cathode material of the present embodiment has a chemical formula of LiNi 0.799 co 0.1 mn 0.1 m 0.001 o 2 @Li 2 NO 4 ; where M is Zr and W; N is Zr, Al and W; the average particle size of single crystal particles is 1.5-3μm, and the specific surface area is 0.4-0.8cm 2 / g.

[0066] The preparation method of the single crystal ternary cathode material of this embodiment, the specific steps are as follows:

[0067] (1) NiSO 4 、CoSO 4 , MnSO 4 According to the Ni:Co:Mn molar ratio of 0.80:0.10:0.10, a mixed solution with a total metal ion concentration of 1.6mol / L was prepared, and then a 10mol / L NaOH solution was prepared;

[0068](2) Pass the mixed solution into the reactor, then feed the NaOH solution and the ammonia solution into the reactor and stir for 70 hours, adjust the reaction temperature to 70°C, and the stirring speed to 500r / min, and keep the pH in the reactor at 10. After filtering and washing with water, vacuum-dry at 1...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a single crystal ternary positive electrode material and a preparation method and application thereof, the chemical formula of the single crystal ternary positive electrode material is LiNixCoyMnzM (1-x-y-z) Oc (at) LiaNdOb, 0 < x < = 0.65, 0 < y < = 0.15, 0 < z < = 0.35, 0 < a < = 6, 0 < b < = 4, 1 < c < = 2, and 1 < = d < 2; m and N are at least one of Zr, Ni, Al, Cu, Co, Sr, Mn, Y, Ti, Mg, Mo, B, Sn, Fe, Zn, Si or W. The single-crystal ternary positive electrode material disclosed by the invention is a single-crystal material with a core-shell structure, and is low in surface residual lithium, stable in internal and external structures, high in energy density and excellent in cycle performance and dynamic performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a single crystal ternary positive electrode material and a preparation method and application thereof. Background technique [0002] Ternary cathode materials have been attracting the attention of the new energy industry because of their high specific capacity, high specific energy density, good cycle, safety and low cost. Generally, in order to obtain a higher capacity, the research and development direction of ternary materials is mainly divided into the following two types: the first direction is to increase the nickel content and prepare high-nickel materials, but Li and Ni have similar radii, and the exchange between Ni and Li leads to lithium Nickel mixed arrangement, the greater the concentration of nickel ions in the lithium layer, the more difficult it is to deintercalate lithium in the layered structure, the worse the stability of the material,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/624H01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 朱青林李长东阮丁山蔡勇刘伟健
Owner GUANGDONG BRUNP RECYCLING TECH
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