Nickel cobalt lithium aluminate cathode material surface coating method

A technology of nickel-cobalt lithium aluminate and positive electrode materials, which is applied in the direction of positive electrodes, battery electrodes, lithium batteries, etc., can solve the problems of slow charging speed, complicated operation, and poor uniformity of aluminum coating, so as to improve the uniformity of coating, Good cycle stability and good heat storage performance

Inactive Publication Date: 2018-06-29
邴玉萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at this stage, the popularization and development of electric vehicles is restricted by problems such as insufficient power battery life, slow charging speed, and high cost. This is also the main reason why many consumers are discouraged. impact on the market penetration of electric vehicles
Nickel-cobalt-lithium-aluminate cathode material is the core key material of power lithium battery. The nickel-cobalt-lithium-aluminate cathode material currently used is usually coated with aluminum solution in inorganic salt solution or organic solvent system for a single aluminum coating, which is not only complicated to operate, but also The uniformity of the coated aluminum is relatively poor, and the obtained nickel-cobalt-lithium-aluminate cathode material has poor cycle stability, and the thermal storage performance of the lithium battery prepared by using this nickel-cobalt-lithium-aluminate cathode material is not strong

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for coating the surface of a nickel-cobalt lithium aluminate cathode material, characterized in that it comprises the following specific steps:

[0023] 1. Configure aluminum isopropoxide sol: Add aluminum isopropoxide to toluene, heat and stir ultrasonically, control the temperature at 60°C, and control the stirring rate at 500R / Min until all aluminum isopropoxide is dissolved to form aluminum isopropoxide Sol ready for use;

[0024] 2. Pour the industrial alcohol into the conical mixing device and stir, then add the nickel-cobalt-lithium-aluminate cathode material matrix, and continue to stir for 10Min until it is completely mixed and a slurry is formed;

[0025] 3. Continue to stir the slurry in step 2, and slowly add the aluminum isopropoxide sol obtained in step 1, control the addition speed of the aluminum isopropoxide sol at 500mL / min, and continue stirring for 46 minutes after the addition of the sol is completed .

[0026] 4. Heating in 100℃ water ba...

Embodiment 2

[0031] A method for coating the surface of a nickel-cobalt lithium aluminate cathode material, characterized in that it comprises the following specific steps:

[0032] 1. Configure aluminum isopropoxide sol: Add aluminum isopropoxide to toluene, heat and stir ultrasonically, control the temperature at 60~80°C, and control the stirring rate at 500R / Min until the aluminum isopropoxide is completely dissolved to form isopropoxide Alcohol aluminum sol for use;

[0033] 2. Pour the industrial alcohol into the conical mixing device and stir, then add the nickel-cobalt-lithium-aluminate cathode material matrix, and continue to stir for 10Min until it is completely mixed and a slurry is formed;

[0034] 3. Continue to stir the slurry in step 2, and slowly add the aluminum isopropoxide sol obtained in step 1, control the addition speed of the aluminum isopropoxide sol at 700mL / min, and continue stirring for 60 minutes after the addition of the sol is completed .

[0035] 4. Heating ...

Embodiment 3

[0040] A method for coating the surface of a nickel-cobalt lithium aluminate cathode material, characterized in that it comprises the following specific steps:

[0041] 1. Configure aluminum isopropoxide sol: add aluminum isopropoxide to toluene, heat and stir ultrasonically, control the temperature at 80°C, and control the stirring rate at 500R / Min until all the aluminum isopropoxide is dissolved to form aluminum isopropoxide Sol ready for use;

[0042] 2. Pour the industrial alcohol into the conical mixing device and stir, then add the nickel-cobalt-lithium-aluminate cathode material matrix, and continue to stir for 10Min until it is completely mixed and a slurry is formed;

[0043] 3. Continue to stir the slurry in step 2, and slowly add the aluminum isopropoxide sol obtained in step 1, control the addition speed of the aluminum isopropoxide sol at 1000mL / min, and continue stirring for 60 minutes after the addition of the sol is completed .

[0044] 4. Heating in 120°C wa...

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PUM

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Abstract

The invention discloses a nickel cobalt lithium aluminate cathode material surface coating method. The method is characterized in that industrial alcohol and a nickel cobalt lithium aluminate cathodematerial matrix are mixed to obtain slurry, an aluminium iso-propoxide sol is taken as an aluminium coating solvent, two-time aluminium coating can be carried out, and after two-time heat treatment, anickel cobalt lithium aluminate-coated cathode material finished product is produced. The method has the advantages of easy industrialization, uniform coating and simple operation, improves the coating insufficiency of the previous aluminium inorganic salt solutions or organic solvent system aluminium solutions, at the same time, coating uniformity is increased through two-time aluminium coating,and the obtained target product nickel cobalt lithium aluminate cathode material has good cycle stability and good heat storage of a lithium battery.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for coating the surface of a nickel-cobalt-lithium-aluminate cathode material. Background technique [0002] With the improvement of people's living standards, people pay more and more attention to environmental pollution. PM 2.5, as an important air pollutant, is also increasingly known by people. The main source of PM2.5 is the exhaust emitted by traditional internal combustion engine vehicles. In order to reduce PM2.5 emissions, the development of new energy electric vehicles and the replacement of traditional internal combustion engine vehicles have become the general trend. At the same time, with the increasing energy crisis, electric vehicles The development and application of the technology has become the focus of global attention. [0003] However, at this stage, the popularization and development of electric vehicles is restricted by problems such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/485H01M4/62H01M10/052
CPCH01M4/366H01M4/485H01M4/525H01M4/62H01M10/052H01M2004/028Y02E60/10
Inventor 邴玉萍
Owner 邴玉萍
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