Preparation method of alumina coated lithium cobaltate positive electrode material

A technology for coating lithium cobaltate and positive electrode materials, which is applied in the field of preparation of alumina-coated modified lithium cobaltate positive electrode materials, can solve the problems of cumbersome filtering and washing processes, reduced production efficiency, and increased costs, and achieve good battery life. Chemical cycle stability, damage reduction, uniform coating effect

Active Publication Date: 2014-12-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The material has good electrochemical properties. Under the condition of charging and discharging in the voltage range of 2.75-4.4V, the specific capacity of the first charge and discharge is 178.5mAh / g, and the capacity after 30 cycles is 159.2mAh / g; but its stability still needs to be solved. Improvement, and the filtration and washing process of materials is more cumbersome, which will result in reduced production efficiency and increased costs

Method used

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  • Preparation method of alumina coated lithium cobaltate positive electrode material
  • Preparation method of alumina coated lithium cobaltate positive electrode material
  • Preparation method of alumina coated lithium cobaltate positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Calculated by mass ratio, namely Al 2 O 3 : LiCoO 2 =1:100 ratio, select aluminum isopropoxide as the aluminum source, calculate the amount of aluminum isopropoxide according to the required amount of aluminum oxide, and heat 100g lithium cobaltate and 4.0g aluminum isopropoxide in a converter to At 140°C, the aluminum isopropoxide was vaporized, kept for 2 hours, and then water vapor (approximately 500ml) was slowly introduced, and then rotated for 1 hour. The temperature was increased to 300°C and kept at a constant temperature for 3 hours, and then naturally cooled to room temperature to obtain the alumina of the invention. Coated LiCoO 2 The product, the alumina quality is LiCoO 2 1% of quality. From figure 2 It can be seen that the morphology of the lithium cobalt oxide particles modified by the method remains basically unchanged, that is, the morphology of the lithium cobalt oxide particles will not be damaged, and the excellent processing performance of the pure p...

Embodiment 2

[0017] Calculated by mass ratio, namely Al 2 O 3 : LiCoO 2 =1:200 ratio, select aluminum stearate as the aluminum source, calculate the amount of aluminum stearate according to the required amount of alumina, put 100g of lithium cobaltate and 8.60g of aluminum stearate in a converter and heat to 150°C, vaporize the aluminum stearate in it, keep it warm for 0.5h, then slowly pass in water vapor (about 500ml), then rotate for 1.5h, continue to heat up to 300°C and keep constant temperature for 4 hours, and then naturally cool to room temperature to obtain the present invention Alumina coated LiCoO 2 The product, the alumina quality is LiCoO 2 0.5% of quality.

Embodiment 3

[0019] Calculated by mass ratio, namely Al 2 O 3 : LiCoO 2 =1:125 ratio, select aluminum acetate as the aluminum source, calculate the amount of aluminum acetate according to the required amount of alumina, put 100g lithium cobaltate and 3.2g aluminum acetate in a converter and heat it to 220°C, so that The aluminum acetate is vaporized, kept for 1 hour, then water vapor (about 500ml) is slowly introduced, and then rotated for 2 hours, the temperature is continued to be increased to 400°C and kept at a constant temperature for 5 hours, and then naturally cooled to room temperature to obtain the aluminum oxide coated LiCoO of the present invention 2 The product, the alumina quality is LiCoO 2 0.8% of quality.

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Abstract

The invention discloses a preparation method of an aluminum oxide coated lithium cobaltate positive electrode material, and the lithium cobaltate surface is evenly coated with an alumina thin film by vapor phase deposition method. The preparation process is as follows: mixing evenly an aluminum-containing compound and lithium cobaltate in a converter, heating the aluminum-containing compound for vaporization, then introducing water vapor to allows the aluminum-containing compound to be hydrolyzed into aluminum hydroxide for deposition onto the lithium cobaltate surface, and heating to obtain the aluminum oxide coated lithium cobaltate positive electrode material. The method has the advantages that the preparation process is simple and suitable for large-scale production, the synthesized aluminum oxide coated lithium cobaltate positive electrode material is coated evenly with the alumina and excellent in cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a method for preparing an aluminum oxide-coated modified lithium cobalt oxide cathode material. Background technique [0002] Lithium cobalt oxide has good electrochemical performance and mature production process, and is one of the most widely used cathode materials for lithium-ion batteries. However, due to the lack of cobalt resources and the high price, in addition, in order to keep LiCoO 2 Cycle stability, usually lithium cobalt oxide charge and discharge cut-off voltage is 3.0-4.2V (compared to Li + / Li), each LiCoO during charge and discharge 2 There are only about 0.5 lithium ions intercalated in the molecule, so that its actual specific capacity is only 120-140mAh / g, which is only about 50% of its theoretical specific capacity of 274mAh / g. These factors have restricted the application and development of lithium cobalt oxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58
CPCH01M4/366H01M4/483H01M4/525H01M10/0525Y02E60/10
Inventor 王保峰赵飞王俊生薛鹏曹杰贺诗阳罗天佐梁永光张平黄德勇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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