Method for coating high-nickel ternary material with aluminum oxide and boron oxide

A high-nickel ternary material, coated alumina technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of long sintering equipment, poor cycle performance, cumbersome process, etc., to shorten the production cycle and reduce the return The effect of fire temperature and streamlining process steps

Inactive Publication Date: 2018-05-29
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the ternary cathode material is used alone, its cycle performance is generally poor. The main reason is that it has an irreversible reaction with the electrolyte, which causes the capacity to decay too quickly.
It has been possible to cover these two materials twice by dry coating

Method used

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  • Method for coating high-nickel ternary material with aluminum oxide and boron oxide
  • Method for coating high-nickel ternary material with aluminum oxide and boron oxide
  • Method for coating high-nickel ternary material with aluminum oxide and boron oxide

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preparation example Construction

[0032] 3) Preparation of dry material: separating the solid and liquid of the suspension coated with alumina, and drying the obtained solid material to obtain a dry material;

[0033] 4) Coating of boron oxide: the dry material is mixed with a boron-containing compound, and then sintered to obtain a finished product of high-nickel ternary material coated with alumina and boron oxide;

[0034] The composition of the high-nickel ternary material is LiNi 0.8 co x mn y o 2 , where 0

[0035] Preferably, the content of coated Al per 1 kg of high-nickel ternary material is 0.05-2 g, and the content of coated B is 0.5-2 g; more preferably, the content of coated Al per 1 kg of high-nickel ternary material is 1-1.7 g, the content of coating B is 0.9-1.1 g.

[0036] Preferably, the composition of the high-nickel ternary material is LiNi 0.8 co 0.1 mn 0.1 o 2 , namely NCM811.

[0037] Further, the high-nickel ternary material is a high-nickel base m...

Embodiment 1

[0053] Example 1 The finished product processing method of the high-nickel ternary material coated with alumina and boron oxide is as follows:

[0054] 1. Use conventional NCM811 ternary high-nickel substrate, take 8000g;

[0055] 2. Take 103.623g Al 2 (SO 4 ) 3 18H 2 O and 119.952g H 2 C 2 o 4 2H 2 O was dissolved in 800mL deionized water to obtain a coating solution;

[0056] 3. Pour 8000g of substrate into 5600mL of deionized water, and stir at 1300rpm for 5 minutes to fully disperse the material and fully contact the surface impurities with water to form a suspension;

[0057] 4. Add the coating solution dropwise into the suspension at a rate of 0.8mL / s under stirring at 1300rpm, and continue stirring for 20 minutes after the dropwise addition to obtain an aluminum-coated material;

[0058] 5. Centrifuge the suspension to obtain a wet material;

[0059] 6. Put the wet material into a double-cone vacuum drying oven, control the vacuum degree to ≤0.01MPa, dry it at...

Embodiment 2

[0063] Example 2 The finished product processing method of the high-nickel ternary material coated with alumina and boron oxide is as follows:

[0064] 1. Use conventional NCM811 ternary high-nickel substrate, take 8000g;

[0065] 2. Take Al 2 o 3 122.4g of aluminum sol accounting for 20% by mass, and then dilute it to 900mL with deionized water to obtain a coating solution;

[0066] 3. Pour 8000g of substrate into 5600mL of deionized water, and stir at 1300rpm for 5 minutes to fully disperse the material and fully contact the surface impurities with water to form a suspension;

[0067] 4. Add the coating solution dropwise into the suspension at a rate of 0.8mL / s under stirring at 1300rpm, and continue stirring for 20 minutes after the dropwise addition to obtain an aluminum-coated material;

[0068] 5. Centrifuge the suspension to obtain a wet material;

[0069] 6. Put the wet material into a double-cone vacuum drying oven, control the vacuum degree to ≤0.01MPa, dry it at...

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Abstract

The invention discloses a method for coating a high-nickel ternary material with aluminum oxide and boron oxide. The method includes the steps: 1) mixing an aluminum oxide precursor and water to prepare aluminum oxide coating liquid; 2) mixing the high-nickel ternary material with the aluminum oxide coating liquid to obtain aluminum oxide coating turbid liquid; 3) performing solid-liquid separation on the aluminum oxide coating turbid liquid, and drying obtained solid materials to obtain dry materials; 4) mixing the dry materials and a boron-containing compound and then sintering the dry materials and the boron-containing compound to obtain the finished high-nickel ternary material coated with the aluminum oxide and the boron oxide. According to the treatment method, washing and coating are combined, surface impurities of the high-nickel ternary material can be more effectively removed, coating is performed in a water phase, a coating can more uniformly cover the surface of the material, and further a positive electrode material with a good electrical performance is obtained. According to the coating method, process steps can be simplified, tempering temperature is reduced, tempering time is shortened, production cycle can be shortened, and production cost is saved.

Description

technical field [0001] The invention relates to a method for coating aluminum oxide and boron oxide on a high-nickel ternary material. Background technique [0002] Ternary materials have become a research hotspot in the industry due to their high charge and discharge capacity. High-nickel materials have received more attention because of their higher specific capacity, and processing techniques such as synthesis, sintering, doping, and cladding are key steps to control their performance. Among them, coating is generally the final processing procedure for the positive electrode material, and the performance of the positive electrode material can be greatly improved with a small amount of coating material, so coating is a relatively important processing procedure. [0003] When the ternary cathode material is used alone, its cycle performance is generally poor. The main reason is that the irreversible reaction occurs in contact with the electrolyte, which causes the capacity...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/48H01M4/38H01M4/46
CPCH01M4/366H01M4/38H01M4/463H01M4/48H01M4/525Y02E60/10
Inventor 陈希文阮丁山林波刘伟健李斌
Owner GUANGDONG BRUNP RECYCLING TECH
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