A method for reduce that residual alkali on the surface of high nickel material

A processing method, high-nickel technology, applied in nanotechnology for materials and surface science, electrical components, electrochemical generators, etc., can solve the problems of coating, high-nickel material rate and cycle performance decline, increase battery irreversibility capacity loss and other issues, to achieve the effect of reducing residual alkali, improving processing performance and electrochemical performance

Inactive Publication Date: 2018-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is that it will affect the coating. NCA and nickel-rich ternary materials are easy to form jelly during the homogenization process, mainly because the alkaline oxide content on their surface is too high to absorb water; secondly, it increases the battery life. Irreversible capacity loss while deteriorating cycle performance
[0006] At present, domestic manufacturers generally adopt the process of washing high-nickel materials with water, and then sintering at a lower temperature to reduce the surface residual alkali content of high-nickel materials. This method can clean the surface residual alkali more thoroughly, but its other The disadvantages are also very obvious: for example, the rate and cycle performance of high-nickel materials after treatment are significantly reduced, which seriously restricts the large-scale application of high-nickel materials

Method used

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  • A method for reduce that residual alkali on the surface of high nickel material
  • A method for reduce that residual alkali on the surface of high nickel material

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Experimental program
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Effect test

Embodiment 1

[0027] The high-nickel material used in this embodiment is LiNi 0.85 co 0.1 mn 0.05 o 2 , the surface residual alkali treatment steps are as follows:

[0028] (1) Cleaning: the high nickel material LiNi 0.85 co 0.1 mn 0.05 o 2 placed in supercritical CO 2 In the extraction kettle, at room temperature, under the condition of 10MPa, clean for 0.2 hours, repeat the above cleaning process 3 times;

[0029] (2) Coating: inject Al into the sub-pump of the extraction kettle 2 o 3 aqueous solution with supercritical CO 2 Carry out coating treatment, under the conditions of room temperature and 10MPa, treat for 0.2 hours, wherein Al 2 o 3 The amount of high nickel material LiNi 0.85 co 0.1 mn 0.05 o 2 0.2% of the mass percentage, repeat the above coating process 2 times;

[0030] (3) Sintering: Heat the treated powder to 600°C in an oxygen atmosphere, keep it warm for 5 hours, and then cool it naturally to obtain LiNi, a high-nickel material with low residual alkali 0...

Embodiment 2

[0032] The high-nickel material used in this embodiment is LiNi 0.6 co 0.2 mn 0.2 o 2 , the surface residual alkali treatment steps are as follows:

[0033] (1) Cleaning: the high nickel material LiNi 0.6 co 0.2 mn 0.2 o 2 Place in an extraction kettle equipped with supercritical methanol, wash for 0.1 hour at room temperature and 20MPa, and repeat the above cleaning process twice;

[0034] (2) Coating: Add Al 2 o 3 , ZrO 2 and TiO 2 ethanol solution with supercritical CO 2 Carry out cladding treatment, under the conditions of room temperature and 20MPa, treat for 0.1 hour, wherein Al 2 o 3 , ZrO 2 and TiO 2 The amount of high nickel material LiNi 0.6 co 0.2 mn 0.2 o 2 0.4% of the mass percentage, coated once;

[0035](3) Sintering: Heat the treated powder to 300°C in an oxygen atmosphere, keep it warm for 5 hours, and then cool it naturally to obtain LiNi, a high-nickel material with low residual alkali 0.6 co 0.2 mn 0.2 o 2 .

Embodiment 3

[0037] The high-nickel material used in this embodiment is LiNiO 2 , the surface residual alkali treatment steps are as follows:

[0038] (1) Cleaning: the high nickel material LiNiO 2 placed in supercritical CO 2 In the extraction kettle, at room temperature and under the condition of 35MPa, wash for 0.5 hour and wash once;

[0039] (2) Coating: inject Al(OH) into the auxiliary pump of the extraction kettle 3 aqueous solution with supercritical CO 2 Carry out coating treatment, under the conditions of room temperature and 35MPa, treat for 0.5 hours, wherein Al(OH) 3 The amount of high nickel material LiNiO 2 0.3% of the mass percentage, coated once;

[0040] (3) Sintering: Heat the treated powder to 800°C in compressed dry air, keep it warm for 5 hours, and then cool it naturally to obtain LiNiO, a high-nickel material with low residual alkali 2 .

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Abstract

The invention discloses a treatment method for reducing the residual alkali on the surface of a high-nickel material, comprising the following steps: cleaning: cleaning the high-nickel material by using a supercritical fluid; Coating: coating the cleaned high-nickel material; Sintering: High nickel material with low residual alkali can be obtained by sintering at 300 - 800 DEG C in atmosphere. Using supercritical fluid to clean high nickel material can not only effectively reduce the residual alkali on the surface of high nickel material, but also ensure the drying environment in the preparation process of high nickel material, and ensure the processability and electrochemical properties of high nickel material.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium-ion batteries, and in particular relates to a treatment method for reducing residual alkali on the surface of high-nickel materials. Background technique [0002] As a new type of clean energy, lithium-ion batteries are widely used in contemporary society where environmental problems are increasingly prominent. With the progress of society, people's demand for lithium-ion batteries with lighter weight and longer life is becoming more and more urgent. The key to improving the performance of lithium-ion batteries is to start with their electrode materials. The specific capacity of positive electrode materials has become one of the key factors for improving the specific energy of lithium-ion batteries. [0003] Among the several layered cathode materials commonly used at present, LiCoO 2 The rate and cycle performance are excellent, and the production process is simple, but it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 王庆莉王辉李道聪夏昕杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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