CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, PREPARATION METHOD THEREOF, AND LITHIUM SECONDARY BATTERY CONTAINING SAME

Title:

CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, PREPARATION METHOD THEREOF, AND LITHIUM SECONDARY BATTERY CONTAINING SAME

Document Type and Number:

WIPO Patent Application WO/2011/025080

Kind Code:

A1

Abstract:

The present invention relates to a cathode active material for a lithium secondary battery, a preparation method thereof, and a lithium secondary battery containing the same. The cathode active material for a lithium secondary battery of the present invention comprises a lithium metal oxide secondary particle core portion formed by the aggregation of a plurality of lithium metal oxide primary particles; a first shell portion formed by coating a plurality of barium titanate particles and metal oxide particles on the surface of the secondary particle core portion; and a second shell portion formed by coating a plurality of olivine type lithium iron phosphate particles and conductive particles on the surface of the first shell portion. The cathode active material for a lithium secondary battery of the present invention enables the preparation of a secondary battery having excellent thermal stability, high temperature durability and overcharge stability.

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Inventors:

KIM SEONG-BAE (KR)
KIM WOO-SEONG (KR)
SONG KI-SUP (KR)
HONG JI-JUN (KR)
KO SUNG-TAE (KR)
HEO YOON-JEONG (KR)

Application Number:

PCT/KR2009/004912

Publication Date:

March 03, 2011

Filing Date:

September 01, 2009

Export Citation:

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Assignee:

DAEJUNG EM CO LTD (KR)
KOKAM CO LTD (KR)
KIM SEONG-BAE (KR)
KIM WOO-SEONG (KR)
SONG KI-SUP (KR)
HONG JI-JUN (KR)
KO SUNG-TAE (KR)
HEO YOON-JEONG (KR)

International Classes:

H01M4/48; H01M4/04; H01M10/36

Foreign References:

KR100889622B1	2009-03-20
KR100889451B1	2009-03-24
KR20090008870A	2009-01-22

Other References: