Pretreatment method of cobaltosic oxide for preparing high-voltage lithium cobalt oxide, high-voltage lithium cobalt oxides anode material and preparation method of high-voltage lithium cobalt oxide

A technology of cobalt tetroxide and positive electrode material, which is applied in battery electrodes, circuits, electrical components, etc., to achieve high automation, increase stability, and be suitable for industrial production.

Active Publication Date: 2014-03-05
CHANGSHA RES INST OF MINING & METALLURGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the published patent documents, the method of doping lithium cobalt oxide and coating the finished lithium cobalt oxide is mainly used to improve the comprehensive performance of the material under high voltage, but the raw material is pretreated to realize the Stability at high voltages is less reported

Method used

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  • Pretreatment method of cobaltosic oxide for preparing high-voltage lithium cobalt oxide, high-voltage lithium cobalt oxides anode material and preparation method of high-voltage lithium cobalt oxide
  • Pretreatment method of cobaltosic oxide for preparing high-voltage lithium cobalt oxide, high-voltage lithium cobalt oxides anode material and preparation method of high-voltage lithium cobalt oxide

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Embodiment 1

[0036] A preparation method of the high-voltage lithium cobaltate positive electrode material of the present invention, comprising the following steps:

[0037] (1) Cobalt tetraoxide coating pretreatment: miscible tetraisopropyl titanate and absolute ethanol, the volume ratio of tetraisopropyl titanate and absolute ethanol is controlled at 1:10, forming clear tetraisopropyl titanate Ester mixed solution: Add the powder of tricobalt tetroxide into the tetraisopropyl titanate mixed solution under stirring to form a suspension, and keep stirring for 30 minutes until uniform. In the suspension, tetraisopropyl titanate accounts for three cobalt tetroxide and titanium The percentage of the total mass of tetraisopropyl titanate is 0.1wt%; then, deionized water is added dropwise to the mixed suspension, and the deionized water added dropwise is mixed with tetraisopropyl titanate mixed in the suspension. The volume ratio of the ester mixed solution is 1:1, until a uniform milky white s...

Embodiment 2

[0043] A preparation method of the high-voltage lithium cobaltate positive electrode material of the present invention, comprising the following steps:

[0044] (1) Cobalt tetraoxide coating pretreatment: miscible tetraisopropyl titanate and absolute ethanol, the volume ratio of tetraisopropyl titanate and absolute ethanol is controlled to 1:20, forming clear tetraisopropyl titanate Ester mixture; in the state of stirring, add the powder of tricobalt tetroxide into the tetraisopropyl titanate mixture to form a suspension, and keep stirring for 30 minutes until uniform; in the suspension, tetraisopropyl titanate accounts for three cobalt tetroxide and titanium The percentage of the total mass of tetraisopropyl titanate is 0.1wt%; then, deionized water is added dropwise to the mixed suspension, and the deionized water added dropwise is mixed with tetraisopropyl titanate mixed in the suspension. The volume ratio of the ester mixed solution is 1:1, until a uniform milky white susp...

Embodiment 3

[0050] A preparation method of the high-voltage lithium cobaltate positive electrode material of the present invention, comprising the following steps:

[0051] (1) Cobalt tetroxide coating pretreatment: miscible tetrabutyl titanate solution and absolute ethanol, the volume ratio of tetrabutyl titanate and absolute ethanol is controlled to 1:50, forming a clear mixture of tetrabutyl titanate solution; in the state of stirring, add the powder of tricobalt tetroxide into the tetrabutyl titanate mixture to form a suspension, and keep stirring for 30 minutes until uniform; in the suspension, tetrabutyl titanate accounts for three cobalt tetroxide and tetrabutyl titanate The percentage of the total mass of the solution is 10wt%; then, deionized water is added dropwise to the mixed suspension, and the volume ratio of the dropped deionized water to the tetrabutyl titanate mixed solution mixed in the suspension is 1:1, until a uniform milky white suspension is formed, then stir for 30...

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Abstract

The invention discloses a pretreatment method of cobaltosic oxide. The method comprises the steps of mixing a titanium-containing organic matter with an organic solvent so as to obtain a mixed liquid; adding cobaltosic oxide powder into the mixed liquid under a stirring condition so as to form a turbid liquid, adding deionized water into the turbid liquid, adequately stirring the turbid liquid and the deionized water until a uniform pulp-shaped fluid material is formed, and drying the uniform pulp-shaped fluid material so as to obtain a cobaltosic oxide compound. The high-voltage lithium cobalt oxide can be obtained by adequately mixing the obtained cobaltosic oxide compound, a lithium source and a dopant to obtain a mixture, and performing solid sintering and covering on the mixture at a high temperature. The tap density of the prepared high-voltage lithium cobalt oxide is more than 3.0g / cm<3>, the compaction density is more than 4.2g / cm<3>, the primary discharge gram capacity in the range of 2.8V to 4.34V can reach more than 164mAh / g, and the circulating capacity retention rate in 300 weeks is more than 89 percent. The prepared high-voltage lithium cobalt oxide has the advantages of good processing performance, high tap density, good circulating performance, high specific capacity and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy conversion and storage technology and the preparation of related products, and in particular relates to a lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of rechargeable batteries developed in the 1990s. Due to their small size, light weight, high specific energy, and portability, they are widely used in portable electronic products and mobile tools. [0003] Lithium cobalt oxide, as the first generation of commercial lithium-ion battery cathode material, has many irreplaceable advantages: such as high operating voltage (average operating voltage is 3.7V), stable charge and discharge voltage, high specific energy, good cycle performance, and good conductivity. High efficiency, simple production process, easy preparation, etc. It can be said that lithium cobalt oxide is the most mature and longest com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/525H01M4/62
CPCY02E60/122H01M4/52H01M4/525H01M4/62Y02E60/10
Inventor 李厦胡柳泉覃事彪周友元周耀黄承焕何敏
Owner CHANGSHA RES INST OF MINING & METALLURGY
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