Preparation method of aluminum oxide coated lithium nickel manganese cobalt cathode material

A technology of nickel-cobalt-lithium-manganese-manganese oxide and positive electrode materials, which can be applied to battery electrodes, electrochemical generators, structural parts, etc., and can solve problems such as difficulty in obtaining materials without impurities, reduction in comprehensive electrical properties, and difficulty in drying and removing water. , to achieve the effect of improving electrochemical cycle performance, high tap density and reducing production steps

CN105355911AActive Publication Date: 2016-02-24DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-02-24

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Abstract

The invention belongs to the technical field of battery materials, and discloses a preparation method of an aluminum oxide coated lithium nickel manganese cobalt cathode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering, coating and size stabilization treatment, wherein the step of raw material mixing comprises the steps that a three-dimensional efficient titled mixer is adopted, polyurethane balls serve as a mixing medium, dispersing, even mixing and smashing are conducted on lithium carbonate, a nanometer spherical nickel cobalt manganese hydroxide precursor and polyethylene glycol, and a uniform intermediate mixture is formed. The preparation method of the aluminum oxide coated lithium nickel manganese cobalt cathode material is low in primary sintering temperature, short in sintering time, simple in technology, large in specific capacity and good in cycling performance. The preparation method further has the advantages of being low in investment, reliable in technology, low in operating cost and the like, and the good economic benefit and market promotion value are achieved.
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Description

technical field

[0001] The invention belongs to the technical field of battery materials, and relates to a preparation method of a nickel-cobalt lithium manganate cathode material, in particular to a preparation method of an alumina-coated nickel-cobalt lithium manganate cathode material. Background technique

[0002] Lithium-ion power battery is currently recognized as the most potential vehicle battery at home and abroad. It is mainly composed of positive electrode material, negative electrode material, separator, electrolyte and other parts; among them, the positive electrode material is an important part of lithium-ion battery, and also determines the lithium-ion battery. Therefore, from the perspective of resources, environmental protection and safety performance, finding the ideal electrode active material for lithium-ion batteries is still the primary problem to be solved by international energy materials workers.

[0003] At present, the cathode materials of lithium ...

Examples

Embodiment 1

[0030] A method for preparing an alumina-coated nickel-cobalt-manganate-lithium-manganate positive electrode material, comprising the following steps:

[0031] (1) Mixing of raw materials: Using a three-dimensional high-efficiency inclined mixer and using polyurethane balls as the mixing medium, the lithium carbonate and nano-spherical nickel-cobalt-manganese hydroxide precursors were weighed in a molar ratio of 1:0.53, and the mass ratio of the total mixture was weighed. Disperse, mix and pulverize 10% polyethylene glycol to form a uniform intermediate mixture, wherein the specific gravity of polyurethane balls is 1.3, the ratio of balls to material is 3:4:3, and the mixing time is 3h;

[0032] (2) One-time sintering: the intermediate mixture obtained in step (1) is loaded into a sagger, and sent to a push-plate kiln for sintering to produce nickel-cobalt lithium manganate materials. The sintering process is continuously filled with oxygen, and the sintering temperature is 650...

Embodiment 2

[0038] (1) Mixing of raw materials: using a three-dimensional high-efficiency inclined mixer and using polyurethane balls as the mixing medium, weighing lithium carbonate and nano-spherical nickel-cobalt-manganese hydroxide precursors in a molar ratio of 1:0.535, and the mass ratio of the total mixture Disperse, mix and pulverize 20% polyethylene glycol to form a uniform intermediate mixture, wherein the specific gravity of polyurethane balls is 1.5, the ratio of balls to materials is 3:4:3, and the mixing time is 3h;

[0039] (2) One-time sintering: the intermediate mixture obtained in step (1) is loaded into a sagger, and sent to a push-plate kiln for sintering to produce nickel cobalt lithium manganate materials. The sintering process is continuously filled with oxygen, and the sintering temperature is 700 ℃ ℃, the sintering time is 3h;

[0040](3) Doping: Select nano-scale MgO, dope the nickel-cobalt lithium manganate obtained in step (2), and add the nickel-cobalt lithium...

Embodiment 3

[0045] (1) Mixing of raw materials: using a three-dimensional high-efficiency inclined mixer and using polyurethane balls as the mixing medium, weighing lithium carbonate and nano-spherical nickel-cobalt-manganese hydroxide precursors in a molar ratio of 1:0.55, and the mass ratio of the total mixture Disperse, mix and pulverize 30% polyethylene glycol to form a uniform intermediate mixture, wherein the specific gravity of the polyurethane ball is 1.4, the ratio of the ball to the material is 3:4:3, and the mixing time is 4h;

[0046] (2) One-time sintering: the intermediate mixture obtained in step (1) is loaded into a sagger, and sent to a push-plate kiln for sintering to produce nickel cobalt lithium manganate materials. The sintering process is continuously filled with oxygen, and the sintering temperature is 750 ℃ ℃, the sintering time is 5h;

[0047] (3) Doping: select nano-scale Al 2 O 3 performing doping treatment on the nickel-cobalt lithium manganate obtained in st...