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Preparation method for modified lithium cobalt oxide capable of being recycled at high cut-off voltage

A unique technology of lithium cobalt oxide and cut-off voltage, applied in the field of preparation of modified lithium cobalt oxide, can solve the problems of poor cycle performance of lithium cobalt oxide, excessive delithiation of lithium cobalt oxide, deterioration of structural stability, etc. Cycle performance, inhibition of dissolution, effect of prolonging service life

Inactive Publication Date: 2014-01-01
北京盟固利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, one of the main solutions is to increase the charge cut-off voltage of lithium cobalt oxide. This measure can greatly increase the specific capacity and specific energy density of the battery. The disadvantage is that it will cause excessive delithiation of lithium cobalt oxide, causing structural instability and failure. Oxygen reaction and cobalt loss, the capacity will decay, resulting in a significant decline in cycle performance
Although increasing the cut-off voltage can increase the specific energy density of lithium cobalt oxide, it will lead to the collapse of the internal structure of the material, poor structural stability, and poor cycle performance. Still at 4.3V
The method provided by the present invention is to solve the problem of poor cycle performance of lithium cobalt oxide under high cut-off voltage

Method used

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  • Preparation method for modified lithium cobalt oxide capable of being recycled at high cut-off voltage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 0.95mol cobalt sulfate and 0.05mol manganese sulfate to make 1000ml mixed solution; make ammonia water and 2M sodium hydroxide solution according to volume ratio 1:10 to make mixed solution 1100ml. Add the above two solutions into a 5L reactor at the same rate of 3.0ml / min, control the reaction temperature to 55°C, control the pH value to 11.5, and keep stirring until the addition is complete, and continue to stir for 0.5 hours. The obtained dark brown precipitate was filtered, washed with deionized water, and dried to obtain a manganese-doped cobalt oxyhydroxide precursor. The above precursor and lithium carbonate were uniformly mixed according to the molar ratio of Li and (Co+Mn) of 1.04:1, calcined at 1000°C for 10 hours, cooled and ground to obtain a semi-finished product of lithium cobaltate; The silicon oxide is mixed evenly, calcined at 900°C for 10 hours, cooled and ground to obtain the final modified lithium cobaltate product. In the voltage range of 3.0V ...

Embodiment 2

[0028] Mix 0.95mol cobalt sulfate and 0.05mol manganese sulfate to make 1000ml mixed solution; make ammonia water and 2M sodium hydroxide solution according to volume ratio 1:10 to make mixed solution 1100ml. Add the above two solutions into a 5L reactor at the same rate of 3.0ml / min, control the reaction temperature to 55°C, control the pH value to 11.5, and keep stirring until the addition is complete, and continue to stir for 0.5 hours. The obtained dark brown precipitate was filtered, washed with deionized water, and dried to obtain a manganese-doped cobalt oxyhydroxide precursor. The above precursor and lithium carbonate were uniformly mixed according to the molar ratio of Li and (Co+Mn) of 1.04:1, calcined at 1000°C for 10 hours, cooled and ground to obtain a semi-finished product of lithium cobaltate; the obtained semi-finished product and its mass of 0.5% magnesium oxide Mix evenly, calcinate at 900°C for 10 hours, cool and grind to obtain the final modified lithium co...

Embodiment 3

[0030] Mix 0.95mol cobalt sulfate and 0.05mol manganese sulfate to make 1000ml mixed solution; make ammonia water and 2M sodium hydroxide solution according to volume ratio 1:10 to make mixed solution 1100ml. Add the above two solutions into a 5L reactor at the same rate of 3.0ml / min, control the reaction temperature to 55°C, control the pH value to 11.5, and keep stirring until the addition is complete, and continue to stir for 0.5 hours. The obtained dark brown precipitate was filtered, washed with deionized water, and dried to obtain a manganese-doped cobalt oxyhydroxide precursor. The above precursor and lithium carbonate were uniformly mixed according to the molar ratio of Li and (Co+Mn) of 1.04:1, calcined at 1000°C for 10 hours, cooled and ground to obtain a semi-finished product of lithium cobaltate; the obtained semi-finished product and its mass of 0.5% alumina Mix evenly, calcinate at 900°C for 10 hours, cool and grind to obtain the final modified lithium cobaltate ...

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Abstract

The present invention relates to a preparation method for modified lithium cobalt oxide capable of being recycled at a high cut-off voltage. The preparation method comprises: preparing a manganese-doped lithium cobalt oxide material according to the conventional method in the field, mixing the obtained lithium cobalt oxide half finished product and an additive such as magnesium oxide, alumina, titanium dioxide, silica, tin dioxide, zirconium dioxide, cerium dioxide and the like according to a certain ratio, calcining for 5-20 h at a temperature of 500-1100 DEG C, and grinding to obtain the modified lithium cobalt oxide product. The preparation method has the following characteristics that: operations are simple, the process is easy to control, cycle performances of the synthesized product are significantly more excellent than cycle performances of the unmodified product at the high cut-off voltage so as to increase the cut-off voltage of the lithium ion battery, and the preparation method is suitable for industrialization manufacturing of lithium ion battery positive electrode materials.

Description

technical field [0001] The invention relates to the field of positive electrode materials of lithium ion batteries, in particular to a preparation method of modified lithium cobaltate which can be recycled under high cut-off voltage. Background technique [0002] Due to the characteristics of high working voltage, large specific energy, small self-discharge, long cycle life, light weight, no memory effect, and less environmental pollution, lithium-ion batteries have become the focus of power research and development around the world. Lithium cobalt oxide occupies a major position in the lithium-ion battery cathode material market due to its advantages such as good reversibility, high discharge capacity, good voltage stability and simple production process. [0003] With the development of 3C electronic products such as smartphones, tablet computers, and ultrabooks, manufacturers of electronic products have higher and higher requirements for the energy density of lithium coba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525C01G51/00H01M4/505
CPCY02E60/122C01G51/00H01M4/525H01M10/0525Y02E60/10
Inventor 白珍辉江卫军魏卫张溪苏迎春高月庞自钊朱晓沛崔妍郝振佳
Owner 北京盟固利新材料科技有限公司
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