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High-voltage and high-rate type lithium cobalt oxide cathode material and preparation method thereof

A cathode material, lithium cobalt oxide technology, applied in the field of high-voltage high-rate lithium cobalt oxide cathode material and its preparation, can solve the problems of unstable structure, capacity fading, and inability to exhibit high-voltage and high-rate performance, etc. Convenience, rate-type energy improvement, and excellent electrochemical performance

Inactive Publication Date: 2016-05-18
ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the structure of the current lithium cobalt oxide cathode material is not stable enough in the process of high-voltage high-rate charge and discharge, which will cause serious capacity attenuation and cannot show excellent high-voltage high-rate performance.

Method used

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  • High-voltage and high-rate type lithium cobalt oxide cathode material and preparation method thereof
  • High-voltage and high-rate type lithium cobalt oxide cathode material and preparation method thereof
  • High-voltage and high-rate type lithium cobalt oxide cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: The preparation method of the high-voltage high-rate lithium cobalt oxide positive electrode material adopts the following process steps.

[0030] (1) Lithium carbonate and cobalt oxide are added according to Li / Co=1.02 (mole), and magnesium carbonate is added according to Mg / Co=0.005 (mole); the above mixture is fully mixed with a three-dimensional mixer or a super mixer to obtain Disperse the primary mixture evenly.

[0031] (2) Sinter the primary mixture in an air atmosphere at 950-980°C for 12 hours; the resulting primary sintered product is crushed by air flow or high-speed rotating equipment, and sieved to obtain lithium cobaltate, with an average particle size (D50) of 2 ~4μm.

[0032] (3) Dissolve aluminum isopropoxide in absolute ethanol according to Al / Co=0.005 (mole), then add tetraisobutyl titanate according to Ti / Co=0.005 (mole), stir well and add the above-mentioned lithium cobaltate , fully stirred and mixed, and dried to obtain a secondar...

Embodiment 2

[0036] Embodiment 2: The preparation method of the high-voltage and high-rate lithium cobalt oxide positive electrode material adopts the following process steps.

[0037] (1) Lithium carbonate and cobalt oxide are added according to Li / Co=1.00 (mole), and magnesium carbonate is added according to Mg / Co=0.002 (mole); the above mixture is fully mixed with a three-dimensional mixer or a super mixer to obtain Disperse the primary mixture evenly.

[0038] (2) The primary mixture is sintered in an air atmosphere at 930-950°C for 10 hours; the obtained primary sintered product is crushed by airflow or high-speed rotating equipment, and sieved to obtain lithium cobaltate, and the average particle size (D50 ) is 2 to 4 μm.

[0039] (3) Dissolve aluminum isopropoxide in absolute ethanol according to Al / Co=0.003 (mole), then add tetraisopropyl titanate according to Ti / Co=0.003 (mole), stir well and add the above cobalt acid Lithium, stirred and mixed thoroughly, and dried to obtain a ...

Embodiment 3

[0043] Embodiment 3: The preparation method of the high-voltage and high-rate lithium cobalt oxide positive electrode material adopts the following process steps.

[0044] (1) Lithium carbonate and cobalt oxide are added according to Li / Co=1.03 (mole), and magnesium carbonate is added according to Mg / Co=0.01 (mole); the above mixture is fully mixed with a three-dimensional mixer or a super mixer to obtain Disperse the primary mixture evenly.

[0045] (2) Sinter the primary mixture in an air atmosphere at 900-920°C for 14 hours; the obtained primary sintered product is crushed by air flow or high-speed rotating equipment, and sieved to obtain lithium cobaltate, and the average particle size (D50 ) is 2 to 4 μm.

[0046] (3) Dissolve aluminum n-pentoxide in isopropanol according to Al / Co=0.001 (mole), then add tetraisooctyl titanate according to Ti / Co=0.01 (mole), stir well and add the above-mentioned cobalt acid Lithium, stirred and mixed thoroughly, and dried to obtain a sec...

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Abstract

The invention discloses a high-voltage and high-rate type lithium cobalt oxide cathode material and a preparation method thereof. The preparation method comprises steps as follows: cobalt oxide and lithium carbonate are taken as precursors, magnesium carbonate is added, and lithium cobalt oxide can be obtained after primary sintering and breaking; an aluminum alkoxide and titanate mixed alcoholic solution is added, secondary sintering is performed after mixing, and lithium cobalt oxide can be obtained. When discharge voltage is up to 4.5 V and the rate is 0.2C (1C=177.5 mAh / g), specific capacity of lithium cobalt oxide prepared with the method is higher than 190 mAh / g, rate performance of 1C / 0.2C is higher than 98%, and 3.6V voltage platform occupancy is higher than 99%; the material has the characteristics of stable structure and smaller specific discharge capacity attenuation in a high-voltage and high-rate charging and discharging process; according to the method, a voltage window, capacity performance and rate performance of the lithium cobalt oxide cathode material are successfully improved, further, the technology is simple, the implementation is convenient, the cost is low, and the prepared high-voltage and high-rate type lithium cobalt oxide cathode material has excellent electrochemical performance.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a high-voltage, high-rate lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] Since the commercialization of lithium-ion batteries, because of their advantages such as high working voltage, high energy density, long service life, wide working temperature range, no memory effect and no pollution, they have been widely used in the fields of communication, mobile and electric tools. As the most commonly used cathode material for lithium-ion batteries, lithium cobalt oxide is widely used in various portable electronic devices, such as notebook computers, mobile phones and tablet computers. The theoretical discharge specific capacity of the lithium cobalt oxide cathode material is 274mAh / g, but only about 50% of the lithium can be extracted from the material in practical applications, which means the actual discharge specific c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/366H01M4/485H01M4/525H01M4/628H01M10/0525H01M2004/028H01M2220/20H01M2220/30Y02E60/10
Inventor 李文李彦斌魏爱佳刘振法张利辉
Owner ENERGY RESOURCES INST HEBEI ACADEMY OF SCI
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