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Cathode active material, method for preparing same, and lithium secondary battery comprising same

By using lithium transition metal oxide particles and specific composite particles in the cathode active material of lithium secondary batteries to form a coating layer or internal doping, the problems of cracking and shortening of the lifespan of the cathode active material of lithium secondary batteries are solved and achieved Higher structural stability and battery cycle performance.

Active Publication Date: 2015-10-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, until now, the actual situation is that it is difficult to solve the crack phenomenon (crack) of the positive electrode active material, the reduction of the capacity of the secondary battery, and the reduction of the output.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0080] The preparation method of the positive electrode active material according to an embodiment of the present invention may include the steps of mixing and heat-treating lithium transition metal oxide particles and composite particles. (La (1-x) Sr x MnO 3 ), CSZ, SSZ, and Ni-YSZ, or a mixture of two or more of them.

[0081] Preferably, according to an embodiment of the present invention, the above-mentioned composite particles include one or a mixture of two or more selected from the group consisting of YSZ, CSZ and SSZ.

[0082] According to an embodiment of the present invention, the above heat treatment may be performed at a temperature range of 100° C. to 1200° C. for 4 hours to 24 hours.

[0083] According to a method for preparing a positive electrode active material according to an embodiment of the present invention, a coating layer is formed on the surface of the lithium transition metal oxide particles or the composite particles are contained in the lithium ...

Embodiment

[0123] Hereinafter, the present invention will be further described with examples and experimental examples, but the present invention is not limited by these examples and experimental examples.

[0124]

preparation example 1

[0126] 55.84g of LiOH (H 2 O), the average particle diameter of 123.61g is the Ni of 12 μ m 0.6 mn 0.2 co 0.2 (OH) 2 The experimental stirrer was placed, and mixing was performed for 1 minute so that the rotational speed of the central part of the experimental stirrer was 18000 rpm.

[0127]The obtained above-mentioned precursor was put into a 500 cc aluminum crucible, and calcined at a temperature of about 900° C. and an air (Air) atmosphere for 6 hours. The cake obtained after calcination was pulverized, and then classified using a 400-mesh sieve (manufactured by Taylor Standard Sieve in the United States) to obtain LiNi 0.6 mn 0.2 co 0.2 o 2 .

[0128]

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PUM

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Abstract

The present invention provides a cathode active material comprising: lithium transition metal oxide particles; and composite particles, wherein the composite particles comprise any one or a mixture of two or more selected from the group consisting of yttria stabilized zirconia (YSZ), gadolinia-doped ceria (GDC), lanthanum strontium gallate magnesite (LSGM), lanthanum strontium manganite (LSM) and Ni-YSZ, the cathode active material characterized by having composite particles of single-phase peak when measured by X-Ray Diffraction (XRD) analysis. The cathode active material according to one embodiment of the present invention can minimize the capacity reduction or the output reduction of the secondary battery, and can also further improve the lifespan characteristics thereof.

Description

technical field [0001] The invention relates to a positive electrode active material, a preparation method thereof and a lithium secondary battery containing the positive electrode active material. Background technique [0002] Lithium secondary batteries are small, lightweight, and high-capacity batteries that have been widely used as power sources for portable devices since their introduction in 1991. Recently, with the rapid development of electronics, communications, and computer industries, there have been camcorders, mobile phones, personal notebook computers, etc., which have shown remarkable development. As a power source that can drive these portable electronic information and communication devices, Li The demand for secondary batteries is also increasing day by day. [0003] However, the lithium secondary battery has a problem that the life of the battery rapidly becomes shorter as the charge and discharge are repeated. In particular, this problem is more serious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/525H01M4/505H01M4/13
CPCH01M4/13H01M4/38H01M4/505H01M4/525H01M4/131H01M4/62H01M2004/028H01M4/366H01M10/0525Y02E60/10Y02T10/70H01M2220/20H01M2220/30H01M10/052
Owner LG CHEM LTD
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