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Method for preparing cathode active material for lithium secondary battery, and cathode active material prepared by preparation method

A technology for positive electrode active materials and raw materials, which is applied in the field of preparing positive electrode active materials for lithium secondary batteries and the positive electrode active materials prepared therefrom, can solve problems such as the limitations of high temperature life characteristics and high temperature resistance characteristics, and improve high temperature resistance characteristics. , The effect of improving the high temperature life characteristics

Pending Publication Date: 2021-12-10
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome these problems, a method of forming a coating on the surface of the positive electrode active material at a low temperature after washing the positive electrode active material has conventionally been studied, but the method still has limitations in high temperature lifetime characteristics and high temperature resistance characteristics sex

Method used

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  • Method for preparing cathode active material for lithium secondary battery, and cathode active material prepared by preparation method
  • Method for preparing cathode active material for lithium secondary battery, and cathode active material prepared by preparation method
  • Method for preparing cathode active material for lithium secondary battery, and cathode active material prepared by preparation method

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preparation example Construction

[0044] The method for preparing positive electrode active material according to the present invention comprises the following steps: by using 1 (where M1 An alkaline aqueous solution containing at least one of sodium (Na) and aluminum (Al) forms a first coating layer on the surface of a lithium transition metal oxide represented by the following formula 1; A coating of said lithium transition metal oxide with coating elements containing M 2 (where M 2 dry blending raw materials comprising boron (B) and heat treating the mixture to form the second coating,

[0045] [Formula 1]

[0046] Li a Ni b co c mn d al e x f o 2

[0047] Among them, in formula 1,

[0048] 1.03≤a≤1.12, 0.7≤b<1.0, 0

[0049] X contains at least one element selected from the group consisting of zirconium (Zr), B, tungsten (W), magnesium (Mg), cerium (Ce), hafnium (Hf), tantalum (Ta), titanium (Ti), strontium (Sr), barium (Ba), fluorine (F), phosphorus (P)...

Embodiment approach

[0141] Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the embodiments according to the present invention can be modified into many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided in order to more completely explain the present invention to those skilled in the art.

Embodiment 1

[0144] As the positive active material precursor, LiOH·H 2 O, Ni 0.88 co 0.05 mn 0.07 (OH) 2 and Al(OH) 3 , and calcined the mixture at 780 °C for 12 hours to prepare LiNi 0.86 co 0.05 mn 0.07 al 0.02 o 2 Represented nuclear particles.

[0145] Subsequently, distilled water and the core particles prepared above were mixed in a weight ratio of 1:1 (mass ratio of 140g:140g) and washed for 5 minutes. Thereafter, the washed product is separated and filtered to make the water content 5-7%, and 0.028g NaOH and 0.255g NaAlO 2 Coating solutions dissolved in 14 g of distilled water were mixed, followed by drying at 130°C. Subsequently, the above dried product was mixed with H 3 BO 3 Mixed at a weight ratio of 100:0.57 and heat-treated at 300 °C for 8 hours to prepare a positive active material coated with Li-Na-Al-B-O solid solution.

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Abstract

The present invention relates to: a method for preparing a cathode active material; a cathode active material prepared by the preparation method; and a cathode for a lithium secondary battery and a lithium secondary battery, which comprise the cathode active material, the method comprising the steps of: forming a first coating layer on the surface of a lithium transition metal oxide, represented by chemical formula 1, by using a basic aqueous solution containing a coating element M1 (M1 comprises at least one selected from Na and Al); and forming a second coating layer by dry mixing and heat treating the lithium transition metal oxide, having the first coating layer formed thereon, and a material containing a coating element M2 (M2 comprises B).

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2019-0088560 filed on July 22, 2019, the content of which is incorporated herein by reference in its entirety. technical field [0003] The invention relates to a method for preparing a positive electrode active material for a lithium secondary battery, a positive electrode for a lithium secondary battery comprising the positive electrode active material prepared by the preparation method, and a lithium secondary battery. Background technique [0004] With the technological development of mobile devices and the increase in demand for mobile devices, the demand for secondary batteries as an energy source has increased dramatically. Among secondary batteries, lithium secondary batteries exhibiting high energy density and high voltage and having longer cycle life and low self-discharge rate have been commercialized and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525H01M2004/028Y02E60/10C01G53/50C01P2002/54C01P2002/52C01P2006/40C01P2002/89H01M4/1391H01M4/13915H01M4/1315H01M4/582C01P2004/80C01P2002/50C01B35/128H01M10/052C01F7/78H01M4/04
Inventor 严浚浩安东骏林采镇金芝慧郑秉埙
Owner LG CHEM LTD