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Coated ternary positive electrode material and preparation method and application thereof

A cathode material and a coating type technology, which is applied in the field of cathode materials for lithium ion batteries, can solve the problems of complex procedures, decreased structural stability, unfavorable industrial production, etc., and achieves the effect of reducing the mixed discharge of lithium and nickel and reducing the residual alkali on the surface.

Pending Publication Date: 2020-04-07
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, multiple washings will inevitably lead to a decrease in structural stability while reducing residual alkali, and the complex process is not conducive to industrial production.

Method used

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  • Coated ternary positive electrode material and preparation method and application thereof
  • Coated ternary positive electrode material and preparation method and application thereof
  • Coated ternary positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Preparation of ternary cathode material Li 1.01 Ni 0.5 co 0.2 mn 0.25 Ge 0.05 o 2 , then using TaF 5 Coating the ternary material while reducing the residual alkali includes the following steps:

[0060] Preparation of ternary cathode material:

[0061] (1) According to the stoichiometric ratio Li 1.01 Ni 0.5 co 0.2 mn 0.25 Ge 0.05 o 2 , weighed 18.66g lithium carbonate and 22.7g lithium hydroxide, 91.61g Ni 0.5 co 0.2 mn 0.3 (OH) 2 Precursor, 5.23g GeO 2 Put it in a three-dimensional mixer, add polyurethane balls, and mix well.

[0062] (2) Put the uniformly mixed material in a sagger for heat treatment, calcined in an oxygen atmosphere, first raise the temperature to 350°C at a rate of 2°C / min and keep it for 2h, then raise the temperature to 900°C and keep it for 15h, and then heat it at 7.5°C / min rate to cool to room temperature to obtain a ternary cathode material without post-treatment such as washing, and the residual alkali on the surface is r...

Embodiment 2

[0067] Preparation of ternary cathode material Li 1.02 Ni 0.6 co 0.2 mn 0.18 In 0.02 o 2 , then using TaF 5 Coating the ternary cathode material while reducing the residual alkali includes the following steps:

[0068] Preparation of ternary cathode material:

[0069] (1) According to the stoichiometric ratio Li 1.02 Ni 0.6 co 0.2 mn 0.18 In 0.02 o 2 , weighed 19.02g lithium carbonate and 33.96g lithium acetate, 91.99g Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor, 2.78g In 2 o 3 Put it in a three-dimensional mixer, add polyurethane balls, and mix well.

[0070] (2) Put the uniformly mixed material in a sagger for heat treatment, and calcinate it in an oxygen atmosphere. At a rate of 8°C / min, first raise the temperature to 500°C and keep it for 1h, then raise the temperature to 880°C and keep it for 10h, and then heat it at 5°C The rate of / min is cooled to room temperature to obtain a ternary positive electrode material without post-treatment such as washing, and t...

Embodiment 3

[0075] Preparation of ternary cathode material Li 1.04 Ni 0.65 co 0.15 mn 0.17 Ca 0.03 o 2 , then using TaF 5 Coating the ternary cathode material while reducing the residual alkali includes the following steps:

[0076] Preparation of ternary cathode material:

[0077] (1) According to the stoichiometric ratio Li 1.04 Ni 0.65 co 0.15 mn 0.27 Ca 0.03 o 2 , weighed 23.37g lithium hydroxide and 35.85g lithium nitrate, 91.98g Ni 0.65 co 0.15 mn 0.2 (OH) 2 The precursor and 1.68g CaO were placed in a three-dimensional mixer, and polyurethane balls were added and mixed evenly.

[0078] (2) Put the uniformly mixed material in a sagger for heat treatment, calcined in an oxygen atmosphere, first raise the temperature to 400°C for 3 hours at a rate of 5°C / min, then raise the temperature to 860°C for 12.5h, and then heat it at 10°C The rate of °C / min is cooled to room temperature to obtain a ternary cathode material without post-treatment such as washing, and the surfac...

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Abstract

The invention discloses a coated ternary positive electrode material and a preparation method and application thereof. The coated ternary positive electrode material comprises a ternary positive electrode material and a lithium-and-tantalum-containing coating layer coated on the surface of the ternary positive electrode material. According to the preparation method, a tantalum compound is used asa coating raw material to coat a ternary material containing residual alkali on the surface, the residual alkali reacts with the tantalum compound to form the lithium-and-tantalum-containing coating layer on the surface of the ternary positive electrode material, so that the coated ternary positive electrode material is obtained, and the residual alkali comprises Li2CO3 and / or LiOH. By adopting the preparation method disclosed by the invention, the electrochemical properties such as rate capability and cycle performance of the material can be improved while the solubility of residual alkali and the material is reduced.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and relates to a ternary positive electrode material, in particular to a coated ternary positive electrode material, a preparation method and an application thereof. Background technique [0002] Ternary cathode materials have been widely used in electric vehicles and hybrid electric vehicles due to their advantages of high specific capacity, environmental friendliness and good thermal stability. However, the bottleneck limiting the application of ternary materials is their poor safety, which is due to the residual Li on the surface of ternary materials. 2 O and CO in the air 2 and H 2 O reacts to form Li 2 CO 3 and LiOH, Li 2 CO 3 Easily decomposed into CO 2 gas, causing the battery to swell with gas, posing a safety hazard. [0003] In order to improve the safety performance and cycle stability of ternary materials, multiple washings are usually used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 黄友军杨春香严武渭杨順毅黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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