Preparation of lithium cobaltate as anode material of lithium ion cell from nano tricobalt tetroxide

A lithium-ion battery and cobalt tetroxide technology, which is applied in battery electrodes, chemical instruments and methods, and active material electrodes, etc., can solve the problems of limiting the application of liquid-phase synthesis methods, difficulty in industrialization, etc., achieve low hardness, improve product performance, and mix materials uniform effect

Inactive Publication Date: 2004-02-04
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Although the liquid-phase synthesis method has many advantages, the products obtained often require further high-temperature treatment to show good electrochemical pr

Method used

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  • Preparation of lithium cobaltate as anode material of lithium ion cell from nano tricobalt tetroxide
  • Preparation of lithium cobaltate as anode material of lithium ion cell from nano tricobalt tetroxide
  • Preparation of lithium cobaltate as anode material of lithium ion cell from nano tricobalt tetroxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Nano cobalt tetroxide is prepared according to the method (patent application number: 01135170.5), and the particle size is 20-50nm.

[0034] Raw material Li 2 CO 3 and Nano Co 3 o 4 Fully mix according to the molar ratio Li / Co=1.05, roast in the first stage, heat up to 750°C at a speed of 2°C / min, keep it for 6 hours, and then cool down at a speed of 2°C / min to complete the first stage of heating; after ball milling, the second stage Roasting, then raising the temperature to 900°C at a heating rate of 2°C / min, keeping the temperature for 6 hours, and cooling down to obtain a block product. Finally, the lithium cobaltate powder was prepared by jet crushing and classification. The weight ratio of ball powder in the mixture is 1-1.2:1, and the air pressure for product crushing and classification is 2.5Kg. Product indicators:

[0035] The structure conforms to JCPDS standard card 16-427;

[0036] Granularity: D 50 =9.046μm, D 5 - D95 = 3.30-57.09 μm;

[0037] Spe...

Embodiment 2

[0042] Nano cobalt tetroxide is prepared according to the method (patent application number: 01135170.5), and the particle size is 20-50nm.

[0043] Raw material Li 2 CO 3 and Nano Co 3 o 4 Fully mix according to the molar ratio Li / Co=1.03, roast in the first stage, heat up to 750°C at a speed of 4°C / min, keep it warm for 6 hours, and then cool down at a speed of 4°C / min to complete a stage of heating; after ball milling, the second stage Roasting, then raising the temperature to 900°C at a heating rate of 4°C / min, keeping the temperature for 6 hours, and cooling down to obtain a block product. Finally, the lithium cobaltate powder was prepared by jet crushing and classification. The weight ratio of ball powder in the mixture is 1-1.2:1, and the air pressure for product crushing and classification is 2.5Kg. Product indicators:

[0044] The structure conforms to JCPDS standard card 16-427;

[0045] Granularity: D 50 =8.406μm, D 5 - D95 = 3.35-21.24 μm;

[0046] Specif...

Embodiment 3

[0051] Nano cobalt tetroxide is prepared according to the method (patent application number: 01135170.5), and the particle size is 20-50nm.

[0052] Raw material Li 2 CO 3 and Nano Co 3 o 4 Mix thoroughly according to the molar ratio Li / Co=1.05, roast in the first stage, raise the temperature to 750°C at a speed of 5°C / min, keep it for 6 hours, and then cool down at a speed of 5°C / min to complete the first stage of heating; after ball milling, the second stage Roasting, then raising the temperature to 900°C at a heating rate of 5°C / min, keeping the temperature for 8 hours, and cooling down to obtain a block product. Finally, the lithium cobaltate powder was prepared by jet crushing and classification. The weight ratio of ball powder in the mixture is 1-1.2:1, and the air pressure for product crushing and classification is 2.5Kg. Product indicators:

[0053] The structure conforms to JCPDS standard card 16-427;

[0054] Granularity: D 50 = 10.495 μm, D 5 - D95 = 3.11-3...

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Abstract

The method by which take nano-scale-size tricobalt tetroxide as raw material to prepare the battery's positive electrode material, the Lithium Cobalt Oxide; it belongs to the field of chemical materials. This invention takes the nano-scale-size tricobalt tetroxide Co3O4 powder and battery grade lithium carbonate as raw materials, adopts two stage solid phase synthesis for preparation, the potassium carbonate and nano-scale-size tricobalt tetroxide molar ratio Li/Co=1.03-1.05. This invention uses nano Co3O4 powder as raw materials to prepare LiCoO2, improves the property of products, simplifies the working procedure of materials mixing, reduces the temperature of reaction, shortens time of reaction, the products which is obtained has the equal shape the particle size varies in a small scale, the property of charging and discharging exceeds the same domestic and international products.

Description

(1) Technical field [0001] The invention relates to a method for preparing lithium cobalt oxide, a cathode material of a lithium ion battery, by a two-stage solid-phase roasting method, which belongs to chemical materials [0002] technology field. (2) Background technology [0003] Lithium Cobalt Oxide LiCoO 2 The crystal belongs to the hexagonal lattice of the trigonal crystal system, the space point group is R3m, and has α-NaFeO 2 type structure. Among them, oxygen ions are tightly packed in distorted cubes, lithium ions and cobalt ions alternately occupy the positions of octahedral holes layer by layer, and layered CoO 2 The framework structure provides a two-dimensional channel for the migration of lithium ions. When the secondary lithium battery is charged and discharged, lithium ions can be deposited in the positive electrode material LiCoO 2 reversibly deintercalated. When charging, lithium ions are extracted from the positive electrode material and inserted in...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/48H01M4/52H01M4/58
CPCC01P2006/12H01M4/1391Y02E60/122C01P2002/72C01P2002/88C01P2006/40C01P2002/52H01M4/525C01P2004/03C01G51/42C01P2004/51C01P2006/11C01P2004/61Y02E60/10
Inventor 孙思修张卫民杨延钊俞海云
Owner SHANDONG UNIV
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