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Cathode active material for secondary battery, method of manufacturing the same, and cathode for lithium secondary battery including the cathode active material

a secondary battery and active material technology, applied in the direction of final product manufacturing, sustainable manufacturing/processing, cell components, etc., can solve the problems of high raw material cost, low structural stability, and limit the application of high-capacity batteries for electric vehicles, so as to improve cycle characteristics and conductivity and density. , the effect of improving the quality

Inactive Publication Date: 2015-08-13
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for making a cathode active material with improved conductivity and density by coating multiple layers of metal composite oxide to a uniform thickness. This material can be used to improve the cycle characteristics of a secondary battery.

Problems solved by technology

With respect to LiCoO2 which has currently been most widely used among the above cathode active materials due to excellent life characteristics and charge and discharge efficiency, it has limitations in being applied to high-capacity batteries for electric vehicles due to the fact that it has low structural stability, has high raw material costs, and causes environmental pollution.
With respect to a lithium manganese oxide, such as LiMnO2 and LiMn2O4, studied as an alternative material of LiCoO2, it is inexpensive, but has disadvantages in that electrical conductivity is low, capacity is low, and electrode degradation rapidly occurs at high temperature.
Also, with respect to the lithium-containing nickel oxide, it has battery characteristics of high discharge capacity, but has disadvantages in that it is difficult to be synthesized by a simple solid-state reaction and its cycle characteristics are low.

Method used

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  • Cathode active material for secondary battery, method of manufacturing the same, and cathode for lithium secondary battery including the cathode active material
  • Cathode active material for secondary battery, method of manufacturing the same, and cathode for lithium secondary battery including the cathode active material
  • Cathode active material for secondary battery, method of manufacturing the same, and cathode for lithium secondary battery including the cathode active material

Examples

Experimental program
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Effect test

preparation example 1

Preparation of Metal Glycolate Solution

[0079]40 g of zirconium nitride (ZrN) and 10 g of citric acid (C6H8O7) were stirred in 200 g of an ethylene glycol (C2H6O2) solution to prepare a mixed solution. The mixed solution was primarily heated at a temperature of 150° C. for 5 hours, and then secondarily heated at a temperature of 180° C. for 1 hour to prepare a zirconium glycolate solution.

preparation example 2

Preparation of Metal Glycolate Solution

[0080]30 g of titanium isopropoxide (Ti(OCH(CH3)2)4) and 10 g of citric acid (C6H8O7) were stirred in 200 g of an ethylene glycol (C2H6O2) solution to prepare a mixed solution. The mixed solution was primarily heated at a temperature of 150° C. for 5 hours, and then secondarily heated at a temperature of 180° C. for 1 hour to prepare a titanium glycolate solution.

preparation example 3

Preparation of Metal Glycolate Solution

[0081]20 g of calcium acetate (Ca(C2H3O2)2) and 10 g of citric acid (C6H8O7) were stirred in 200 g of an ethylene glycol (C2H6O2) solution to prepare a mixed solution. The mixed solution was primarily heated at a temperature of 140° C. for 5 hours, and then secondarily heated at a temperature of 180° C. for 1 hour to prepare a calcium glycolate solution.

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Abstract

The present invention relates to a cathode active material including a lithium-containing transition metal oxide and two or more metal composite oxide layers selected from the group consisting of Chemical Formulae 1 to 3 which are coated on the surface of the lithium-containing transition metal oxide, a method of manufacturing the same, and a cathode for a secondary battery including the cathode active material,M(C2H5O2)n  [Chemical Formula 1]M(C6H(8-n)O7)  [Chemical Formula 2]M(C6H(8-n)O7)(C2H5O2)  [Chemical Formula 3](where M, as a metal desorbed from a metal precursor, represents at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Y, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ir, Ni, Zn, Al, Ga, In, Si, Ge, Sn, La, and Ce, and n is an integer between 1 and 4).

Description

TECHNICAL FIELD[0001]The present invention relates to a cathode active material for a secondary battery, a method of manufacturing the same, and a cathode for a lithium secondary battery including the cathode active material, and more particularly, to a cathode active material uniformly coated with two or more metal composite oxide layers, a method of manufacturing the same, and a cathode for a lithium secondary battery including the cathode active material.BACKGROUND ART[0002]In line with the increasing use of mobile devices and vehicles, demand for secondary batteries as their energy sources has been rapidly increased. As the secondary batteries, lithium secondary batteries having high energy density, high voltage, long cycle life, and low self-discharging rate have been commercialized and widely used.[0003]A lithium secondary battery may be largely composed of a cathode active material, an anode active material, a separator, and an electrolyte. Specifically, a carbon material has...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/485H01M4/04H01M10/052H01M4/60H01M4/131
CPCH01M4/485H01M4/60H01M4/131H01M2004/028H01M4/0471H01M4/0404H01M4/0416H01M10/052H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/5825H01M4/62Y02E60/10H01M4/48H01M10/0525Y02P70/50
Inventor LEE, DONG KWONCHO, SEUNG BEOMNHO, JUN SEOKJANG, WOOK
Owner LG CHEM LTD
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