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

A technology of nickel-cobalt-lithium-aluminate and cathode materials, which is applied in the direction of nanotechnology for materials and surface science, battery electrodes, electrical components, etc., can solve the problems of affecting electrochemical performance and uneven coating layer, and achieve good High rate discharge performance, simple process and low cost

Active Publication Date: 2018-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this operation may make the coating layer uneven and affect the electrochemical performance

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate:

[0045] Li 2 MnO 3 The mass percentage content is 3wt%, Li 2 MnO 3 A coating layer with a thickness of 3nm is formed and coated on nickel-cobalt-aluminate lithium; the positive electrode material is a spherical particle with a particle size of 5-15 μm, and the molecular formula is Li 2 MnO 3 / LiNi 0.8 co 0.15 Al 0.05 o 2 .

[0046] Such as figure 1 As shown, the nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate obtained in the embodiment of the present invention is a spherical particle with a particle size of 5-15 μm, with a lithium manganate coating layer on the surface.

[0047] Such as figure 2 As shown, the matrix part of the nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate obtained in the embodiment of the present invention is lithium nickel-cobalt-aluminate, and a lithium manganate coating layer with a thickness ...

Embodiment 2

[0059] A nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate:

[0060] LiMnO 2 The mass percentage content is 8wt%, LiMnO 2 A coating layer with a thickness of 6nm is formed and coated on nickel-cobalt-aluminate lithium; the positive electrode material is a spherical particle with a particle size of 5-15 μm, and the molecular formula is LiMnO 2 / LiNi 0.8 co 0.15 Al 0.05 o 2 .

[0061] After testing, the nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate obtained in the embodiment of the present invention is a spherical particle with a particle size of 5-15 μm, with a lithium manganate coating layer on the surface.

[0062] It has been detected that the matrix part of the nickel-cobalt-lithium-aluminate-coated lithium manganate cathode material obtained in the embodiment of the present invention is lithium nickel-cobalt-aluminate, and a lithium manganate coating layer with a thickness of 6 nm is formed on the surface....

Embodiment 3

[0074] A nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate:

[0075] LiMn 2 o 4 The mass percentage content is 10wt%, LiMn 2 o 4Form a coating layer with a thickness of 15nm and coat it on nickel-cobalt-aluminate lithium; the positive electrode material is a spherical particle with a particle size of 5-15 μm, and the molecular formula is LiMn 2 o 4 / LiNi 0.8 co 0.15 Al 0.05 o 2 .

[0076] After testing, the nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate obtained in the embodiment of the present invention is a spherical particle with a particle size of 5-15 μm, with a lithium manganate coating layer on the surface.

[0077] It was detected that the matrix of the nickel-cobalt-lithium-aluminate cathode material coated with lithium manganate obtained in the embodiment of the present invention was lithium nickel-cobalt-aluminate, and a lithium manganate coating layer with a thickness of 15 nm was formed on the s...

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Abstract

Disclosed are a lithium manganate-coated lithium nickel cobalt aluminate positive electrode material and a preparation method thereof. Lithium manganate accounts for 1-10wt% of the material based on mass percentage composition; lithium manganate forms a coating layer with thickness of 2-20nm 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 surfactant into water, and performing heating and stirring; (2) adding a manganese source, performing stirring and dissolving, and then adding aluminum nickel cobalt hydroxide, and performing heating, stirring and evaporating to dryness; (3) performing calcining in air atmosphere, and cooling; and (4) adding a lithium salt, and performing two-stage sintering in flowing oxidizing atmosphere. The positive electrode material disclosed in the invention has relatively high cycle stability and high-rate discharging performance; by virtue of the coating layer, the material structure can be stabilized, and the secondary reaction between an electrolyte and an active material can be suppressed effectively; and the method 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 nickel cobalt lithium aluminate positive electrode material coated with lithium manganate and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of stable voltage, high capacity, high energy density, less self-discharge, long cycle life, and environmental friendliness. They are widely used in electric vehicles, power tools, mobile phones, notebook computers and other fields. From mobile devices to electric vehicles, with the continuous expansion of the application of energy storage systems, the demand for high-energy-density lithium-ion batteries is also increasing, and the cathode material in lithium-ion batteries is the key material that determines the performance of lithium-ion batteries. High energy density, Long cycle life and high safety cathode materials have become the research and develo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 张佳峰杨卓韦韩信王小玮张建永张宝明磊
Owner CENT SOUTH UNIV
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