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A one-step method for co-modifying ternary cathode materials by ion doping and surface coating

A positive electrode material and surface coating technology, which is applied in the field of ion doping and surface coating to modify ternary positive electrode materials, can solve the problems of complex modification process of ternary positive electrode materials, improve the stability of material structure and save costs , Reduce the effect of interface side reactions

Active Publication Date: 2021-12-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies such as the complex modification process of the existing ternary positive electrode material, and provide a one-step combined modification method for element doping and coating on the surface layer of the ternary positive electrode material

Method used

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  • A one-step method for co-modifying ternary cathode materials by ion doping and surface coating
  • A one-step method for co-modifying ternary cathode materials by ion doping and surface coating
  • A one-step method for co-modifying ternary cathode materials by ion doping and surface coating

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Embodiment 1

[0036] 1. Using 8-hydroxyquinoline as a complexing agent, tetrabutyl titanate as a metal ion salt solution, and LiNi 0.8 co 0.1 mn 0.1 o 2 As the substrate, prepare the surface Ti doping and TiO 2 The specific preparation method of the coated nickel-based positive electrode material is as follows:

[0037] 1. Weigh an excess of 20% 8-hydroxyquinoline at the ratio of metal ion: 8-hydroxyquinoline = 1:4 (mol), dissolve the complexing agent and ternary material in absolute ethanol solution, and ultrasonically After processing for 15 minutes, continue to stir for 2 hours to obtain a ternary positive electrode material adsorbed by a complexing agent, and the amount of the metal ion salt solution is 2%wt of the mass of the substrate;

[0038] 2. Add the metered ratio of tetrabutyl titanate (TBOT) dropwise to the above mixed solution which is being stirred, and keep stirring at room temperature for 2 hours;

[0039] 3. Transfer the above fully mixed solution to an 80°C oil bath,...

Embodiment 2

[0045] 1. Using 8-hydroxyquinoline as complexing agent, aluminum isopropoxide as metal ion salt solution, and LiNi 0.8 co 0.1 mn 0.1 o 2 As the matrix, prepare the surface layer Al doping and Al 3 o 2 The specific preparation method of the coated nickel-based positive electrode material is as follows:

[0046] 1. Weigh an excess of 20% 8-hydroxyquinoline at the ratio of metal ion: 8-hydroxyquinoline = 1:3 (mol), dissolve the complexing agent and ternary material in absolute ethanol solution, and ultrasonically After 15 minutes of treatment, continue stirring for 2 hours to obtain a ternary positive electrode material adsorbed by a complexing agent, the amount of the metal ion salt solution being 1.5%wt of the mass of the substrate;

[0047] 2. Add the metered ratio of aluminum isopropoxide dropwise to the stirring above mixed solution, and keep stirring at room temperature for 2 hours;

[0048] 3. Transfer the above fully mixed solution to an 80°C oil bath, and continue ...

Embodiment 3

[0053] 1. Use 8-hydroxyquinoline as complexing agent and magnesium chloride as Mg 2+ Ionic salt solution, with LiNi 0.8 co 0.1 mn 0.1 o 2 As a substrate, prepare a surface layer Mg-doped and MgO-coated nickel-based positive electrode material. The specific preparation method is as follows:

[0054] 1. Weigh an excess of 20% 8-hydroxyquinoline at the ratio of metal ion: 8-hydroxyquinoline = 1:2 (mol), dissolve the complexing agent and ternary material in absolute ethanol solution, and ultrasonically After processing for 15 minutes, continue stirring for 2 hours to obtain a ternary positive electrode material adsorbed by a complexing agent, and the amount of the metal ion salt solution is 1%wt of the mass of the substrate;

[0055] 2. Add the metered ratio of aluminum isopropoxide dropwise to the stirring above mixed solution, and keep stirring at room temperature for 2 hours;

[0056] 3. Transfer the above fully mixed solution to an 80°C oil bath, and continue stirring unt...

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Abstract

The invention discloses a one-step method for realizing metal ion doping and metal oxide surface coating to jointly modify a ternary positive electrode material, comprising the following steps: S1. Mixing a complexing agent and a ternary positive electrode material into a solvent, Continue to stir the reaction after ultrasonic; S2. Add the metal ion salt solution to be doped and coated dropwise into the S1 mixed solution under stirring, and then continue to stir the reaction; S3. Heat the S2 mixed solution and continue to stir until the solvent is completely Volatilize to obtain a mixed powder; S4. Calcinate the powder obtained in S3 at 400-600° C. for 4-6 hours, and cool to room temperature to obtain a modified material. The invention adopts a simple process and selects a method assisted by a complexing agent to prepare a modified ternary positive electrode material whose surface layer is element-doped and surface-coated in one step. Doping effectively inhibits the transformation of the crystal structure of the surface layer of the material during the cycle, and the coating layer prevents direct contact with the electrolyte, inhibits the occurrence of side reactions, and improves the cycle stability of the material. By optimizing the synthesis process, the cost can be effectively saved, and the method has great application prospects.

Description

technical field [0001] The invention relates to the technical field of cathode materials for lithium batteries, and relates to the modification of ternary cathode materials for lithium batteries, and more specifically, to a method for jointly modifying ternary cathode materials by ion doping and surface coating in one step. Background technique [0002] The cathode material of ternary lithium-ion battery has become a current research hotspot due to its advantages of high capacity and low cost, and is considered to be the main cathode material for the next generation of lithium-ion power battery. However, some technical barriers that still exist currently severely limit the expansion of the commercial scale of ternary materials. In particular, high-nickel ternary cathode materials still have a certain gap from large-scale commercial applications in terms of stability, safety, and rate performance. [0003] At present, among domestic lithium-ion battery cathode materials, ter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 施志聪杨少钿樊青录刘军柯曦
Owner GUANGDONG UNIV OF TECH
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