CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES WITHHIGH SAFETY, METHOD OF PREPARING THE SAME, AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME

摘要

The present invention relates to a cathode active material for lithium se condary batteries with high safety, a method of preparing the same and lithi um secondary batteries comprising the same. The cathode active material of t he present invention comprises a lithium metal oxide secondary particle core portion formed by aggregation of lithium metal oxide primary particles; and a shell portion formed by coating the secondary particle core portion with an olivine - structured lithium iron phosphate oxide. The cathode active mat erial of the present invention allows to manufacture lithium secondary batte ries with improved safety, especially overcharge characteristics.