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Step-by-step echelon-doped ternary positive electrode material and preparation method thereof

A technology of positive electrode materials and ternary materials, which is applied in the field of step-by-step doping of ternary positive electrode materials and its preparation, can solve problems such as inability to fully develop, and achieve excellent electrochemical performance, low production cost, and easy control.

Active Publication Date: 2020-09-18
GEM WUXI ENERGY MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, propose a step-by-step doping ternary positive electrode material and its preparation method, and solve the problem that the dopant is added together in the existing doping process in the prior art, and its advantages cannot be fully utilized. technical issues

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  • Step-by-step echelon-doped ternary positive electrode material and preparation method thereof
  • Step-by-step echelon-doped ternary positive electrode material and preparation method thereof
  • Step-by-step echelon-doped ternary positive electrode material and preparation method thereof

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preparation example Construction

[0020] Such as figure 1 , the first aspect of the present invention provides a method for preparing a step-by-step doped ternary positive electrode material, comprising the following steps:

[0021] S1: Thoroughly mix the precursor of the ternary material, the first lithium source and the dopant a, and sinter at 750-950° C. for 2-8 hours to obtain a lithiated product. In this embodiment, the selected ternary material precursor is Ni x co y mn 1-x-y (OH) 2 , where x≥1 / 2, y≥1 / 10; the molar ratio of the ternary material precursor to lithium in the first lithium source is 1:(0.9~1.1); the molar ratio of the ternary material precursor to the dopant a 1:(0.01~0.10) Within this ratio range, the doping effect is the best. The doping elements contained in the dopant a include one or more of Rh, Mo, and Pd. In the specific embodiment of the present invention, the dopant a is Rh 2 o 3 、MoO 3 or one or more of PdO, in other implementations, it can also be other dopants, which is ...

Embodiment 1

[0027] The ternary material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 10mol, Li 2 CO 3 5mol and Rh 2 o 3 0.1mol is fully mixed evenly, and sintered at 900°C for 5h to obtain the lithiated product LiNi 0.6 co 0.2 mn 0.2 Rh 0.02 o z (Z>2).

[0028] The lithiated product LiNi 0.6 co 0.2 mn 0.2 Rh 0.02 o z 10mol, Li 2 CO 3 0.5mol and 0.1mol of SrO were fully mixed, and sintered at 900°C for 5h to obtain step-by-step doped single crystal ternary cathode material LiNi 0.6 co 0.2mn 0.2 Rh 0.02 Sr 0.01 o F (F > 2).

Embodiment 2

[0030] The ternary material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 10mol, Li 2 CO 3 5mol and 0.2mol of PdO are fully mixed and evenly sintered at 900°C for 5h to obtain the lithiated product LiNi 0.6 co 0.2 mn 0.2 PD 0.02 o z (Z>2).

[0031] The lithiated product LiNi 0.6 co 0.2 mn 0.2 PD 0.02 o z (Z>2)10mol, Li 2 CO 3 0.5mol and La 2 o 3 0.1mol is fully mixed, and sintered at 900°C for 5h to obtain a step-by-step doped single crystal ternary cathode material LiNi 0.6 co 0.2 mn 0.2 PD 0.02 La 0.02 o F (F > 2).

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Abstract

The invention discloses a step-by-step echelon-doped ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps of fully mixing a ternary material precursor, a first lithium source and a doping agent a, and sintering at 750-950 DEG C for 2-8 hours to obtain a lithiation product, and fully mixing the lithiation product, a second lithium source and a doping agent b, and sintering at 750-950 DEG C for 2-8 hours to obtain the step-by-step echelon-doped ternary positive electrode material. A mode of combining step-by-step lithium preparation and step-by-step doping is adopted, the promoting effect of the doping agent on the growth of unit cells and primary particles and the effect of doped elements on stabilizing a crystal structure can be fully exerted, the antagonistic effect generated by adding of doping agents with different effects at the same time can be avoided, a single crystal ternary positive electrode material with characteristics of excellent performance and excellent morphology is prepared, and the method has characteristics of simpleness, easy control, low production cost, and energy consumption reducing; theobtained step-by-step echelon-doped ternary positive electrode material is of a single crystal structure, and is stable in structure and excellent in electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a step-by-step doped ternary positive electrode material and a preparation method thereof. Background technique [0002] At present, in the lithium-ion battery industry, the consensus on improving the structural stability of ternary materials is to suppress the phase transition during charging and discharging through ion doping, thereby improving the cycle performance of the material, mainly including lithium sites, transition metal cation sites and oxygen sites. Anion and cation doping and compound doping, etc. [0003] In the prior art, generally, the dopant, the precursor and the lithium source are uniformly mixed once by a high-mixer, and then sintered at a high temperature, so that the dopant enters the lattice of the ternary material. However, different kinds of dopants or doping elements have different effects on ternary cathode materials. Specifically, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/0525
CPCH01M4/525H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 许开华赵德徐世国陈玉君张明龙
Owner GEM WUXI ENERGY MATERIAL CO LTD
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