Preparation method of lithium cobaltate positive material coated with nanometer aluminum oxide solid phase

A technology of nano-alumina and positive electrode materials, which is applied in the direction of battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of insufficient cycle performance and high-temperature performance, and achieve improved cycle performance and high-temperature performance, good uniformity, and high-quality products The effect of stable performance

Inactive Publication Date: 2015-06-10
宁夏科捷锂电池股份有限公司
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AI Technical Summary

Problems solved by technology

[0002] At present, the most mature cathode material for lithium-ion batteries is lithium cobalt oxide (LiCoO 2 ), which has the characteristics of high compaction and good processing performance, but its cycle performance and high temperature performance are still insufficient

Method used

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Embodiment Construction

[0008] Embodiments of the inventive method go through the following steps:

[0009] Step 1, preparation of lithium cobaltate: add tricobalt tetroxide and lithium carbonate into the three-dimensional mixing equipment according to the lithium-cobalt molar ratio of 1.06, and add 1500ppm basic magnesium carbonate, mix at 25Hz for 4 hours, put the materials into the crucible, and use a horse Furnace was sintered at 980°C for 10 hours, and then cooled with the furnace, and the material was poured into a crusher for 10 seconds to obtain lithium cobalt oxide with a particle size D50 of 10.5 μm;

[0010] Step 2, nano-alumina solid-phase coating:

[0011] 1. First, add the lithium cobaltate prepared above and the nano-alumina powder with a particle size D50 of 20nm into the ball mill tank of the horizontal planetary ball mill according to the mass ratio of 200:1, and then add grinding balls with twice the mass of the material, and use 250r / m Take out after ball milling at a speed of mi...

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Abstract

The invention relates to preparation of positive material for lithium ion batteries, and in particular relates to a preparation method of lithium cobaltate positive material coated with nanometer aluminum oxide solid phase. The method comprises the following steps: 1, preparing lithium cobaltate, namely, mixing tricobalt tetroxide with lithium carbonate, feeding 1400-1500ppm of basic magnesium carbonate, sintering the mixture at the temperature of 950-980 DEG C, naturally cooling in a furnace, and crushing to obtain lithium cobaltate; and 2, enabling lithium cobaltate to be coated with the nanometer aluminum oxide solid phase, namely, firstly feeding lithium cobaltate and nanometer aluminum oxide powder having the particle size D50 of 20-22nm into a ball mill, feeding grinding balls with the mass twice that of the material, sintering the material treated by ball-milling at the temperature of 780-800 DEG C, then naturally cooling in the furnace, and crushing the cooled material in a crusher to obtain the lithium cobaltate positive material coated with the nanometer aluminum oxide solid phase. After the preparation method is adopted, the cycle performance and the high-temperature performance of the lithium cobaltate positive material can be effectively improved, the coating uniformity of the lithium cobaltate positive material is good, and the product performance is stable.

Description

technical field [0001] The invention relates to the preparation of lithium ion battery positive electrode materials, in particular to a preparation method of nano-alumina solid-phase coated lithium cobalt oxide positive electrode materials. Background technique [0002] At present, the most mature cathode material for lithium-ion batteries is lithium cobalt oxide (LiCoO 2 ), which has the characteristics of high compaction and good processing performance, but its cycle performance and high temperature performance are still insufficient. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for preparing a lithium cobalt oxide positive electrode material coated with uniform and stable nano-alumina solid phase, which can improve the cycle performance and high temperature performance of the lithium cobalt oxide material. [0004] The preparation method of the nano-alumina solid-phase coated lithium cobaltate cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/36H01M10/0525
CPCY02E60/10
Inventor 丛霄
Owner 宁夏科捷锂电池股份有限公司
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