Cathode active material for lithium secondary batteries, method for preparing the same, and lithium secondary batteries comprising the same
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United States of America Patent
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Aug 19, 2014
Grant Date -
Mar 3, 2011
app pub date -
Nov 25, 2009
filing date -
Aug 28, 2009
priority date (Note) -
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Abstract
Disclosed are a cathode active material for lithium secondary batteries, a method for preparing the same, and lithium secondary batteries comprising the same. The cathode active material for lithium secondary batteries comprises a lithium metal oxide secondary particle core formed by aggregation of a plurality of lithium metal oxide primary particles; a first shell formed by coating the surface of the secondary particle core with a plurality of barium titanate particles and a plurality of metal oxide particles; and a second shell formed by coating the surface of the first shell with a plurality of olivine-type lithium iron phosphate oxide particles and a plurality of conductive material particles. The cathode active material for lithium secondary batteries allows manufacture of lithium secondary batteries having excellent thermal stability, high-temperature durability and overcharge safety.
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