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

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...

Examples

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.

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...

Examples

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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