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Method for modifying surface of lithium transition metal oxide positive electrode material

A lithium transition metal and positive electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of surface BET increase, battery impedance increase, uneven coating, etc., achieve small interface BET and improve high-voltage resistance performance , reduce the effect of side effects

Pending Publication Date: 2022-01-21
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common cladding materials are metal oxides, such as A1 2 o 3 , La 2 o 3 、TiO 2 , ZrO 2 etc. The commonly used coating method is solid-phase coating method, which can stabilize the structure, reduce residual lithium, and protect the positive electrode material. The conductance impedance reduces the capacity. At the same time, there is uneven coating in the solid state coating, and the BET of the surface layer increases, which increases the battery impedance and reduces the capacity. Although the residual alkali on the surface is reduced, the capacity is affected.

Method used

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  • Method for modifying surface of lithium transition metal oxide positive electrode material
  • Method for modifying surface of lithium transition metal oxide positive electrode material
  • Method for modifying surface of lithium transition metal oxide positive electrode material

Examples

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Embodiment 1

[0040] In this example, a surface-modified lithium transition metal oxide positive electrode material was prepared, and the specific process was as follows:

[0041] (1) Pour 50kg of deionized water into the washing kettle, then add the first additive LiPO to the deionized water 3 and the second additive Al 2 (SO 4 ) 3 sulfuric acid solution, Al in the second additive 3+ The concentration is 0.2mol / L, stir evenly, and then follow the LiCoO 2 The solid-to-liquid mass ratio of the first-fired powder (particle size Dv50 is 8 μm) and deionized water is 1:0.8, and the amount of the first additive added is LiCoO 2 0.02wt% of the mass of the first-fired powder, 200r / min high-speed stirring to form a uniform first slurry;

[0042] (2) Add TiO dropwise to the first slurry 2+ Concentration of 0.2mol / L TiOSO 4 Sulfuric acid solution, and control the dropping time for 5 minutes. After the dropping is completed, continue to stir at a high speed of 500r / min for 10 minutes to obtain t...

Embodiment 2

[0048] In this example, a surface-modified lithium transition metal oxide positive electrode material was prepared, and the specific process was as follows:

[0049] (1) Pour 50kg of deionized water into the washing kettle, then add the first additive Li to the deionized water 3 PO 4 and the second additive Al 2 Cl 3 sulfuric acid solution, Al in the second additive 3+ The concentration is 0.1mol / L, stir evenly, and then follow the LiCoO 2 The solid-to-liquid mass ratio of the first-fired powder (particle size Dv50 is 10 μm) and deionized water is 1:3, and the amount of the first additive added is LiCoO 2 0.01wt% of the mass of the first-fired powder, 300r / min high-speed stirring to form a uniform first slurry;

[0050] (2) Add TiO dropwise to the first slurry 2+ Concentration of 0.1mol / L TiOSO 4 Sulfuric acid solution, and control the dropwise addition time for 7min, after the dropwise addition is completed, continue to stir at a high speed of 500r / min for 10min to obt...

Embodiment 3

[0055] In this example, a surface-modified lithium transition metal oxide positive electrode material was prepared, and the specific process was as follows:

[0056] (1) Pour 50kg of deionized water into the washing kettle, then add the first additive LiPO to the deionized water 3 and the second additive Y 2 (SO 4 ) 3 sulfuric acid solution, Y in the second additive 3+ The concentration is 0.05mol / L, stir evenly, and then add LiNi according to the solid-liquid mass ratio of high-nickel ternary material primary sintered powder and deionized water as 1:5 0.85 co 0.10 mn 0.05 o 2 (Particle diameter Dv50 is 3 μm) powder, the addition amount of the first additive is 0.01wt% of the mass of the added first-burned powder, 200r / min high-speed stirring forms the uniform first slurry;

[0057] (2) Add ZrO dropwise to the first slurry 2- ZrOSO with a concentration of 0.05mol / L 4 Sulfuric acid solution, and control the dropwise addition time for 6min. After the dropwise addition i...

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Abstract

The invention discloses a lithium transition metal oxide positive electrode material surface modification method, which comprises: adding a first additive, a second additive and a lithium transition metal oxide into water to obtain a first slurry,the first additive being lithium-containing phosphate and the second additive being an acid solution of Y<3+> or Al<3+> salt; dropwise adding a third additive into the first slurry to obtain a second slurry, the third additive being an acidic solution of TiO<2+> or ZrO<2+> salt;dropwise adding a fourth additive to the second slurry to obtain a third slurry, the fourth additive being an alkaline solution of AlO<2-> salt; and centrifuging and drying the third slurry to obtain an intermediate product, mixing the intermediate product with a large-particle positive electrode material, and performing sintering to obtain the surface-modified lithium transition metal oxide material. The coating layer is uniform in component and controllable in thickness, the phenomenon that the surface of a solid-phase structure is not uniform can be improved, a spinel structure substance is generated on the surface of the material in the circulation process, the high-pressure resistance of the material is improved, and the circulation performance of the lithium transition metal oxide positive electrode material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for modifying the surface of a lithium transition metal oxide cathode material. Background technique [0002] Lithium-ion batteries have high capacity, discharge platform and compaction density, and are currently one of the most well-studied and widely used commercial lithium-ion battery cathode materials. Currently commonly used layered lithium-ion batteries include lithium cobalt oxide, low-nickel-nickel-cobalt lithium-manganese oxide, and high-nickel-nickel-cobalt lithium-manganese oxide. Among them, lithium cobalt oxide is widely used in 3C fields such as mobile phones, drones, and notebook computers, and lithium cobalt manganese oxide is widely used in the field of new energy vehicles. [0003] Residual alkali usually refers to the residual soluble Li on the surface of lithium transition metal oxide powder materials 2 CO 3 And LiOH, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/485
CPCH01M4/48H01M4/485Y02E60/10H01M4/366H01M4/505H01M4/525H01M4/1391H01M4/5825H01M4/131C01G51/42C01G51/50C01G53/50H01M10/0525H01M2004/028
Inventor 李斌李长东刘伟健吴星宇阮丁山蔡勇
Owner GUANGDONG BRUNP RECYCLING TECH
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