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Method for preparing single-crystal ternary positive-electrode material

A positive electrode material, single crystal technology, applied in the field of single crystal ternary positive electrode material preparation, can solve the problems of structural lithium extraction, increased experimental complexity, and many by-product gases, to achieve improved thermal stability and improved electrochemical performance , the effect of increasing capacity and voltage

Active Publication Date: 2019-01-29
CNGR ADVANCED MATERIAL CO LTD
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Problems solved by technology

For example, "A Preparation Method of High Voltage Single Crystal Lithium-ion Ternary Cathode Material" with application number 201711173950 and "A Doped Micron-scale Single Crystal Ternary Cathode Material and Its Preparation Technology" with application number 201610443127 In the preparation method disclosed in the Chinese patent, there are many by-product gases in the preparation process, and the annealing temperature is too high, which will easily cause the structural lithium to come out and cause too much residual lithium on the surface of the structure, etc., and the steps are complicated.
At present, there is still a preparation scheme, such as the Chinese patent of "Single Crystal Ternary Cathode Material and Its Preparation Method and Lithium-ion Battery" with application number 201710652580, which discloses the use of lithium source and nickel-cobalt-manganese source in the complexing agent Co-precipitation increases the difficulty of the precursor process; and the preparation of the precursor depends on the one-step or multi-step mixing of lithium salts, which also increases the complexity of the experiment

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  • Method for preparing single-crystal ternary positive-electrode material
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  • Method for preparing single-crystal ternary positive-electrode material

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preparation example Construction

[0028] A method for preparing a single crystal ternary positive electrode material, comprising the following steps:

[0029] S1: Mix lithium oxide with three oxides of nickel, cobalt and manganese in proportion and ball mill; the mass ratio of Li:Ni:Co:Mn is (1.02~1.12):(0.75~0.95):(0.01~0.10): (0.02~0.20), the high nickel content ensures that the capacity of the positive electrode material is high enough. Nickel oxides are NiO, Ni 3 o 4 , NiO 2 、Ni 2 o 3 At least one of the cobalt oxides is Co 3 o 4 、CoO 2 、Co 2 o 3 At least one of the manganese oxides is MnO, Mn 3 o 4 , MnO 2 , Mn 2 o 3 at least one of the During the implementation process, the mass ratio of ball to material used in ball milling is (1~3):1, the speed of ball mill is between 150~250 rpm, and the milling time is 1~4h. The material can be fully mixed evenly, and the particle size of the material after ball milling is 0.5 μm to 3 μm, which is easier to form a new single crystal structure.

[003...

Embodiment 1

[0035] NiO, Co 2 o 3 , Mn 2 o 3 and Li 2 O was mixed and ball milled in proportion; where the molar ratio of Li:Ni:Co:Mn was 1.08:0.84:0.03:0.13. During the implementation process, the mass ratio of ball to material used in the ball mill was 3:1, the speed of the ball mill was 175rpm, and the ball milling time was 3h. The ball-milled product was sintered in an air atmosphere, specifically, the temperature was raised to 490° C. at a rate of 3° C. / min and then kept for 6 hours. Then sinter in an oxygen atmosphere, specifically, the temperature is raised to 750° C. at a rate of 3° C. / min and then kept for 20 hours. Finally, it was naturally cooled to room temperature to obtain a composition of LiNi 0.84 co 0.03 mn 0.13 o 2 single crystal ternary cathode material.

example 2

[0037] NiO, Co 3 o 4 , Mn 3 o 4 and Li 2O was mixed and ball milled in proportion; where the molar ratio of Li:Ni:Co:Mn was 1.06:0.90:0.03:0.07. During the implementation process, the mass ratio of ball to material used in the ball mill was 2.5:1, the rotational speed of the ball mill was 210 rpm, and the ball milling time was 4 hours. The ball-milled product was sintered in an oxygen atmosphere, specifically, the temperature was raised to 550° C. at a rate of 3° C. / min and then kept for 5 hours. Then sintering under an oxygen atmosphere, specifically, the temperature was raised to 730° C. at a rate of 3° C. / min and then kept for 20 hours. Finally, it was naturally cooled to room temperature to obtain a composition of LiNi 0.90 co 0.03 mn 0.07 o 2 single crystal ternary cathode material.

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Abstract

The invention discloses a method for preparing a single-crystal ternary positive-electrode material, belonging to the technical field of lithium ion batteries. The method comprises the following steps: subjecting lithium oxide and the oxides of nickel, cobalt and manganese in a certain ratio to mixing and ball milling; performing primary sintering on a ball-milled material at 400-600 DEG C; carrying out secondary sintering on a product obtained after primary sintering at 650-780 DEG C; and finally, performing natural cooling to room temperature so as to obtain the single-crystal ternary positive-electrode material. The method of the invention directly adopts the oxides as raw materials and avoids the phenomenon of gas generation when hydroxides or carbonate compounds are used as raw materials, so the consistency of an atmosphere, the stability of heat and structural cracking are greatly improved; through direct mixing of the lithium oxide with the oxides of nickel, cobalt and manganese, uniform mixing is realized, the particle size of a sintering raw material is small, and all the elements are uniformly mixed, so a condition for forming a single crystal at a lower temperature is provided.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a single crystal ternary positive electrode material. Background technique [0002] Lithium-ion batteries have great prospects for application in new energy vehicles due to their high capacity, low pollution, and high power. The ternary nickel-cobalt lithium manganese oxide has a good development as the positive electrode of lithium-ion batteries due to its strong comprehensive performance. space. The mainstream structure of the currently prepared ternary nickel cobalt lithium manganese oxide is still secondary particles of different particle sizes, and its performance under high magnification and high working voltage is still not ideal, because the structure consistency and stability of the secondary particles sex is relatively poor. Synthesizing ternary cathode materials with a single crystal structure is a good solution, but the current m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/03C01P2006/11C01P2006/12C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 管剑訚硕罗标刘辉
Owner CNGR ADVANCED MATERIAL CO LTD
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