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Preparation method, product, and applications of aluminum oxide-coated lithium cobalt oxide material

A technology for coating lithium cobalt oxide and alumina, applied in electrode manufacturing, electrochemical generators, electrical components, etc., can solve the problems of battery safety threats, oxidative enhancement, side reactions, etc., and achieve significant performance and cost advantages , Outstanding high pressure performance, good structure effect

Active Publication Date: 2015-04-01
东莞市鸿德电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage conditions, the positive electrode material will undergo irreversible phase transition, which will deteriorate the performance of the battery; at the same time, the oxidation of the positive electrode material will increase, which will pose a threat to the safety of the battery; in addition, at the interface between the positive electrode material and the electrolyte, there will be A strong side reaction occurs, which will also affect battery performance
[0005] Therefore, currently commercialized LiCoO 2 , Li(Co x Ni y mn 1-x-y )O 2 The application of high voltage and other materials is limited, and most of them can only be used below 4.3V

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of the aluminum oxide-coated lithium cobalt oxide material provided in this embodiment includes the following steps:

[0031] (1) The lithium cobaltate powder is preloaded in the mixer, and after the charging is completed, the mixer is vacuumized, and when the preset vacuum degree is reached, the vacuuming is stopped and the mixer is started;

[0032] (2) Mix alumina powder and carbon powder with a molar ratio of 1:0.5~2 evenly, press it into a billet after mixing evenly, and place the pressed billet in a vacuum furnace connected to the mixer In the process, vacuumize the vacuum furnace after filling the material, wherein the vacuum furnace and the mixer are connected through pipelines;

[0033] (3) the vacuum furnace described in step (2) is heated up, and the reaction of alumina powder and carbon powder begins to generate gaseous alumina;

[0034] (4) Import the gaseous aluminum oxide described in step (3) into the mixer and stir to block the p...

Embodiment 2

[0046] The preparation method and application of the aluminum oxide-coated lithium cobalt oxide material provided in this example, its raw material components and steps are basically the same as those in Example 1, the difference lies in:

[0047] (1) Place 2Kg lithium cobalt oxide at 0.1m 3 In the V-shaped stainless steel mixer, vacuumize to 10 -1 Pa.

[0048] (2) Mix alumina powder and graphite powder uniformly at a molar ratio of 1:2 and press them into a compact with a mass of 1Kg.

[0049] (3) The block is placed in a volume of 0.1m 3 In the vacuum furnace, the vacuum is evacuated to 10 -2 Pa, heat up to 1150°C and keep warm.

[0050] (4) After the vacuum furnace is kept warm for 10 hours, open the stop valve between the vacuum furnace and the mixer, start the V-type mixer, and the speed of the mixer is 60r / min.

[0051] (5) After mixing for 10 hours, close the stop valve, open the air inlet of the mixer, and put in air.

[0052](6) After continuing to mix for 10 ho...

Embodiment 3

[0055] The preparation method and application of the aluminum oxide-coated lithium cobaltate material provided in this example, its raw material components and steps are basically the same as those in Examples 1 and 2, the difference is that:

[0056] (1) Place 2Kg lithium cobalt oxide at 0.1m 3 In the V-shaped stainless steel mixer, vacuumize to 10 -4 Pa.

[0057] (2) Mix alumina powder and activated carbon powder uniformly in a molar ratio of 1:2, and then press it into a compact with a mass of 1Kg.

[0058] (3) Place the block in a volume of 0.1m 3 In the vacuum furnace, the vacuum is evacuated to 10 -2 Pa, heat up to 1200°C and keep warm.

[0059] (4) After the vacuum furnace is kept warm for 1 hour, open the stop valve between the vacuum furnace and the mixer, start the V-shaped mixer, and the speed of the mixer is 90r / min.

[0060] (5) After mixing for 5 hours, close the stop valve, open the air inlet of the mixer, and put in air.

[0061] (6) After continuing to m...

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Abstract

The invention discloses a preparation method of an aluminum oxide-coated lithium cobalt oxide material. The preparation method comprises following steps: (1) lithium cobalt oxide powder is delivered into a blender; (2) aluminum oxide powder is uniformly mixed with carbon powder at a molar ratio of 1:0.5-2, compact is obtained via compacting, the compact is delivered into a vacuum furnace communicated with the blender, and vacuumizing is performed; (3) the vacuum furnace is subjected to heating processing; (4) gaseous aluminium (II) oxide is delivered into the blender for stirring, and a pipe arranged between the vacuum furnace and the blender is blocked, so that the surface of the preloaded lithium cobalt oxide powder is uniformly coated after condensation of gaseous aluminium (II) oxide; and (5) an air inlet valve of the blender is open, air is delivered into the blender, liquid aluminium (II) oxide is changed into solid aluminium oxide, and the surface of the lithium cobalt oxide powder is uniformly coated so as to obtain the aluminum oxide-coated lithium cobalt oxide material. The invention also discloses the material prepared via the preparation method, and applications of the material in preparation of cathodes of lithium ion batteries of 4.5V or more.

Description

technical field [0001] The invention relates to a preparation method of alumina material, in particular to a preparation method, product and application of alumina-coated lithium cobalt oxide material. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, safe and fast charging and discharging, low self-discharging rate, long cycle life, little environmental pollution and no memory effect, etc., and have become an indispensable energy storage in people's daily production process device. Lithium-ion batteries mainly include three parts: positive electrode, electrolyte and negative electrode. The electrode material directly determines the performance of the battery. [0003] In the fields of laptops, mobile phones, mobile tools, electric vehicles, etc., people hope that the smaller the volume and weight of the battery, the better when the energy storage remains unchanged, which means that the volumetric energy density a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/525H01M4/1391H01M4/131
CPCH01M4/131H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 盛洪超李尹庆
Owner 东莞市鸿德电池有限公司
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