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High-voltage agglomerated lithium cobalt oxide material, preparation method and application thereof

A high-voltage lithium cobaltate technology, which is applied in the field of high-voltage agglomerated lithium cobaltate materials and its preparation, can solve problems such as unfavorable industrial mass production, achieve good coating effect, improve high-rate performance, and high-rate performance Good results

Pending Publication Date: 2020-07-03
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alcohol solution coating it adopts belongs to liquid phase coating, which is not conducive to industrial mass production

Method used

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  • High-voltage agglomerated lithium cobalt oxide material, preparation method and application thereof
  • High-voltage agglomerated lithium cobalt oxide material, preparation method and application thereof
  • High-voltage agglomerated lithium cobalt oxide material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-voltage agglomerated lithium cobalt oxide material is prepared through the following steps:

[0036] (1) Take three cobalt tetroxide (particle size D50 is 6.05μm), lithium carbonate, titanium dioxide and magnesium oxide respectively according to lithium-cobalt molar ratio is 1.02, Ti element doping amount is 1000ppm and Mg element doping amount is 1000ppm, put them into high-speed Fully mix in the ball mill to obtain primary mixed material;

[0037] (2) Put the primary mixed material obtained in step (1) in a high-temperature furnace, sinter at 950° C. for 10 h in an air atmosphere, and then pulverize the sintered product to obtain a first-sintered product;

[0038](3) Take the one-fired product obtained in step (2), then add cobalt hydroxide with a mass fraction of 3%, aluminum oxide with a mass fraction of 0.1% and titanium dioxide with a mass fraction of 0.02%, and fully mix with a high-speed mixer After uniformity, they are placed in a high-temperature furna...

Embodiment 2

[0042] A high-voltage agglomerated lithium cobalt oxide material is prepared through the following steps:

[0043] (1) Weigh cobalt hydroxide (particle size D50 is 6.12μm), lithium hydroxide, aluminum oxide and nickel hydroxide respectively according to the lithium-cobalt molar ratio of 1.03, the Al element doping amount of 1000ppm and the Ni element doping amount of 1000ppm , put them into a high-speed ball mill and mix well to obtain a primary mixed material;

[0044] (2) Put the primary mixed material obtained in step (1) in a high-temperature furnace, sinter at 900° C. for 10 hours in an air atmosphere, and then pulverize the sintered product to obtain a first-sintered product;

[0045] (3) Take the one-fired product obtained in step (2), then add 3% cobalt tetroxide by mass fraction, 0.1% magnesium oxide by mass fraction and 0.02% titanium dioxide by mass fraction, and fully mix evenly with a high-speed mixer They are placed in a high-temperature furnace, sintered at 800...

Embodiment 3

[0049] A high-voltage agglomerated lithium cobalt oxide material is prepared through the following steps:

[0050] (1) be 1.03 by lithium-cobalt molar ratio, La element doping amount be 2000ppm and Zr element doping amount be that 1000ppm take cobalt carbonate (particle size D50 is 6.05 μ m), lithium nitrate, lanthanum oxide and zirconium dioxide respectively, will Put them into a high-speed ball mill and mix them well to obtain a primary mixed material;

[0051] (2) Put the primary mixed material obtained in step (1) in a high-temperature furnace, sinter at 1000° C. for 10 hours in an air atmosphere, and then pulverize the sintered product to obtain a primary fired product;

[0052] (3) Take the one-fired product obtained in step (2), then add cobalt sulfate with a mass fraction of 3%, alumina with a mass fraction of 0.05%, and titanium dioxide with a mass fraction of 0.05%, and fully mix evenly with a high-speed mixer They are then placed in a high-temperature furnace, sint...

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Abstract

The invention discloses a preparation method of a high-voltage agglomerated lithium cobalt oxide material. The method comprises the following steps: doping a certain amount of a source compound of a doping element D during preparation of primary sintered lithium cobalt oxide; preparing primary sintered lithium cobalt oxide particles with an agglomeration-like structure, forming a coating layer onthe surfaces of the primary sintered lithium cobalt oxide particles by taking a cobalt source B and an additive E as coating agents, and finally sintering and crushing to obtain the lithium cobalt oxide material with the agglomeration-like structure. The doping element D is at least one of Ti, Mg, Ni, La, Zr, Y, Nb and Al. The cobalt source B is at least one of cobaltosic oxide, cobalt hydroxide,cobalt carbonate and cobalt sulfate. The additive E is at least one of a Ti compound, a Mg compound and an Al compound. The lithium cobalt oxide material disclosed by the invention is of an agglomeration-like structure formed by tightly fusing primary particles, the particle size distribution is uniform, the fluidity is good, a coating layer is tight and uniform, and the lithium cobalt oxide material has excellent rate capability and cycle performance under a high-voltage condition.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage agglomerated lithium cobalt oxide material and a preparation method and application thereof. Background technique [0002] In recent years, with the increasing function and intensity of use of 3C digital products, the positive electrode material used in the lithium battery - lithium cobalt oxide material has also achieved rapid development, and the product is constantly being updated. The voltage is also gradually increased from the initial 4.2V to 4.45V. In addition to the digital market generally requiring a discharge below 3C, in order to meet some fields that require high current and high rate discharge (such as start-stop power supply, model aircraft, electric tools, electronic cigarettes, drones, etc.), lithium cobalt oxide is also designed to be able to achieve 5C-100C rate discharge. For example, Chinese patent 201811637781.X introduces a hi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/58H01M10/0525
CPCH01M4/485H01M4/525H01M4/5825H01M10/0525H01M4/366Y02E60/10
Inventor 汪云锋吴建华简健明万国江范江史镇洪邓伟杰赵靖弘张键鹏
Owner JIANGMEN KANHOO IND
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