Lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof

A technology of nickel-cobalt-lithium aluminate and positive electrode materials, which can be applied to battery electrodes, electrical components, electrochemical generators, etc., and can solve the problems of affecting electrochemical performance, low price of nickel-cobalt lithium aluminate, uneven coating layer, etc. , to achieve good cycle stability and high rate discharge performance, reduce surface residual lithium, and simple process

Active Publication Date: 2018-04-20
安徽维晶新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous consumption of petroleum energy, lithium-ion batteries, as a new energy source, have attracted increasing attention due to their advantages such as good safety, high discharge specific energy, and long charge and discharge life, and the positive electrode material in lithium-ion batteries is the most critical Partly, cathode materials such as lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide currently used in the market have been difficult...

Method used

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  • Lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof
  • Lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof
  • Lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material and preparation method thereof

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Embodiment 1

[0040] A nickel-cobalt-lithium-aluminate cathode material coated with lithium cobaltate:

[0041] The mass percentage of the lithium cobaltate is 1wt%, and the lithium cobaltate forms a coating layer with a thickness of 8-15nm to cover the nickel-cobalt-aluminate lithium; the positive electrode material is a spherical particle with a particle size of 5-15μm.

[0042] likefigure 1 As shown, the nickel-cobalt-lithium-aluminate cathode material coated with lithium cobaltate obtained in the embodiment of the present invention is a spherical particle with a particle size of 5-15 μm, with a lithium cobaltate coating layer on the surface.

[0043] like figure 2 As shown, the matrix part of the lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material obtained in the embodiment of the present invention is lithium nickel cobalt aluminate, and a lithium cobalt oxide coating layer with a thickness of 8-15 nm is formed on the surface.

[0044] like image ...

Embodiment 2

[0055] A nickel-cobalt-lithium-aluminate cathode material coated with lithium cobaltate:

[0056] The mass percentage of the lithium cobaltate is 3wt%, and the lithium cobaltate forms a coating layer with a thickness of 10-20nm to cover the nickel-cobalt-aluminate lithium; the positive electrode material is a spherical particle with a particle size of 5-15 μm.

[0057] After testing, the nickel-cobalt-lithium-aluminate cathode material coated with lithium cobaltate obtained in the embodiment of the present invention is a spherical particle with a particle size of 5-15 μm, with a lithium cobaltate coating layer on the surface.

[0058] After testing, the matrix of the lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material obtained in the embodiment of the present invention is lithium nickel cobalt aluminate, and a lithium cobalt oxide coating layer with a thickness of 10-20 nm is formed on the surface.

[0059] After testing, the 006 and 102, 10...

Embodiment 3

[0070] A nickel-cobalt-lithium-aluminate cathode material coated with lithium cobaltate:

[0071] The mass percentage of the lithium cobaltate is 4.8wt%, and the lithium cobaltate forms a coating layer with a thickness of 15-25nm in an amorphous state and coats the nickel-cobalt-aluminate lithium; the positive electrode material has a particle size of 5 ~15 μm spherical particles.

[0072] After testing, the nickel-cobalt-lithium-aluminate cathode material coated with lithium cobaltate obtained in the embodiment of the present invention is a spherical particle with a particle size of 5-15 μm, with a lithium cobaltate coating layer on the surface.

[0073] After testing, the matrix part of the lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material obtained in the embodiment of the present invention is lithium nickel cobalt aluminate, and a lithium cobalt oxide coating layer with a thickness of 15-25 nm is formed on the surface.

[0074] After t...

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Abstract

Disclosed are a lithium cobalt oxide-coated lithium nickel cobalt aluminate positive electrode material and a preparation method thereof. Lithium cobalt oxide accounts for 1-10wt% of the material based on mass percentage composition; lithium cobalt oxide forms a coating layer with thickness of 5-30nm to coat lithium nickel cobalt aluminate; and the positive electrode material is spherical particles with the grain diameter of 5-15[mu]m. The preparation method comprises the following steps of (1) dissolving a water soluble surfactant into water, and heating to perform an ultrasonic stirring reaction; (2) adding aluminum nickel cobalt hydroxide, soluble cobalt salt and soluble lithium salt synchronously, and heating to perform an ultrasonic stirring reaction; (3) performing spraying and drying while ultrasonic stirring; and (4) putting the product into a tubular furnace and performing two-stage sintering in oxidizing atmosphere. The positive electrode material disclosed in the invention has relatively high cycle stability and high-rate discharging performance; by virtue of the method, the problem of surface residue existing the conventional coating can be lowered effectively; and themethod is low in cost, simple in process and suitable for massive industrial production.

Description

technical field [0001] The invention relates to a positive electrode material and a preparation method thereof, in particular to a lithium cobalt oxide-coated nickel cobalt lithium aluminate positive electrode material and a preparation method thereof. Background technique [0002] With the continuous consumption of petroleum energy, lithium-ion batteries, as a new energy source, have attracted increasing attention due to their advantages such as good safety, high discharge specific energy, and long charge and discharge life, and the positive electrode material in lithium-ion batteries is the most critical Partly, cathode materials such as lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide currently used in the market have been difficult to meet market demand. [0003] Nickel-cobalt lithium aluminate has low price, high compaction density, high gram capacity, and higher volume specific capacity than lithium cobalt oxide. It has wide application prospec...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 张佳峰杨卓韦韩信王小玮张建永张宝明磊
Owner 安徽维晶新材料科技有限公司
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