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Modified nickel, cobalt and lithium manganite three-element material and preparation method thereof

A technology of nickel-cobalt lithium manganate and ternary material, which is applied in the field of modified nickel-cobalt lithium manganate ternary material and preparation thereof, modified high-nickel-nickel-cobalt lithium manganate ternary material and preparation field thereof. Solve the problems of affecting the electrical performance, low initial charge and discharge efficiency of the battery, dissolution of Ni and Mn, etc., to optimize the cycle performance, increase the first cycle efficiency, and reduce the change of the surface microstructure.

Active Publication Date: 2017-01-04
GREE ELECTRIC APPLIANCES INC
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AI Technical Summary

Problems solved by technology

However, nickel-cobalt lithium manganese oxide cathode materials, especially high-nickel ternary cathode materials, also have defects. Due to the change of the surface microstructure of the material during the first charging process, the first charge and discharge efficiency of the battery with the ternary material as the cathode material is not good. High, the first effect is generally less than 90%
During the cycle, side reactions will occur with HF in the organic electrolyte, resulting in the dissolution of Ni and Mn, which affects its electrical properties and becomes a shackle for the further development of NCM ternary materials.

Method used

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  • Modified nickel, cobalt and lithium manganite three-element material and preparation method thereof

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preparation example Construction

[0051] The invention provides a method for preparing a modified nickel-cobalt lithium manganese oxide ternary material, comprising the following steps:

[0052] 1) After the nickel-cobalt-lithium-manganese-oxide material is dispersed in water, the nickel-cobalt-lithium-manganate material containing water on the surface is obtained by processing;

[0053] The chemical formula of described nickel cobalt lithium manganate material is as shown in formula (I),

[0054] LiNi 1-x-y co x mn y o 2 (1); Wherein, x>0, y>0, 1>1-x-y>0;

[0055] 2) After mixing the nickel-cobalt-lithium-manganese-oxide material with water on the surface obtained in the above steps, the titanium source and the organic solvent, the hydrolysis reaction is carried out to obtain the nickel-cobalt-lithium-manganate composite material;

[0056] 3) Calcining the nickel-cobalt lithium manganate composite material obtained in the above steps to obtain a modified nickel-cobalt lithium manganate ternary material....

Embodiment 1

[0072] 4g D 50 = 12-14μm high-nickel ternary material Li[Ni0.6Co0.2Mn0.2]O2 is dispersed in 2ml of water, and after magnetic stirring for 30 minutes, the surface of the high-nickel ternary material is fully wetted, and two layers of filter paper with a pore size of 3μm Filtration is performed to obtain a high-nickel ternary material containing water on the surface.

[0073] Then 0.114g of tetraethyl titanate was uniformly dispersed in 250mL of absolute ethanol solution, and the above-mentioned high-nickel ternary material with water on the surface was added, and stirred for 4 hours to allow tetraethyl titanate to undergo in-situ hydrolysis on the surface of the high-nickel ternary material React, react uniformly on the surface of the high-nickel ternary material to generate metatitanic acid, after the reaction is completed, use two layers of filter paper with a pore size of 3 μm to filter, put the product in an oven for 2 hours at 120°C, and obtain a uniformly coated metatitan...

Embodiment 2

[0080] 4g D 50 =12~14um high nickel ternary material Li[Ni 0.6 co 0.2 mn 0.2 ]O 2 Disperse in 2ml of water, stir magnetically for 30 minutes, and filter with two layers of filter paper with a pore size of 3 μm to obtain a high-nickel ternary material with water on the surface.

[0081] Evenly disperse 0.0114g of tetraethyl titanate in 25ml of absolute ethanol solution, add the above-mentioned high-nickel ternary material with water on the surface, stir for 5h, filter with two layers of filter paper with a pore size of 3μm, and put the product in an oven at 120°C Bake for 2 hours to obtain a high-nickel ternary material uniformly coated with metatitanic acid.

[0082] The mass ratio of the substances used in the above steps is tetraethyl titanate: nickel-rich ternary material: water: ethanol = 1:350:175:1750.

[0083] The resultant was heated up to 500°C at a heating rate of 10°C per minute, and calcined at a constant temperature for 5 hours to fully pyrolyze the metatitan...

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Abstract

The invention provides a modified nickel, cobalt and lithium manganite three-element material and a titanium dioxide layer compounded on the surface of the nickel, cobalt and lithium manganite three-element material. The titanium dioxide layer is creatively compounded on the surface of the nickel, cobalt and lithium manganite three-element material, the surface microstructure change of the NCM three-element material in the first-time charging process is effectively decreased, and the first-cycle efficiency is improved. In addition, due to the fact that titanium dioxide serves as a shell layer and form a core-shell structure with the NCM material, only lithium ions can pass through the titanium dioxide layer, and nickel and manganese ions cannot pass through, dissolution of Ni and Mn in the three-element material in the cycling process is reduced, and the cycle performance of the three-element material is optimized.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, relates to a modified nickel-cobalt lithium manganese oxide ternary material and a preparation method thereof, in particular to a modified high-nickel nickel-cobalt lithium manganate ternary material and its preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less white discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields. The main selection object of the power supply. Therefore, lithium-ion batteries and related materials have become a research hotspot for researchers. Cathode material is one of the key materials of lithium-ion batteries, which determines the performance of lithium-ion batteries. At present, the biggest bot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 王晋钟宽钟署亮蒋世用
Owner GREE ELECTRIC APPLIANCES INC
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