Kokam Co., Ltd.

Daejung Em Co., Ltd.

Seong-Bae Kim

Woo-Seong Kim

Ji-Jun Hong

Yoon-Jeong Heo

Sung-Tae Ko

Sung-Tae Koh

Ki-Sup Song

The present invention relates to a cathode active material for lithium secondary batteries with high safety, a method of preparing the same and lithium secondary batteries comprising the same. The cathode active material of the 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 material of the present invention allows to manufacture lithium secondary batteries with improved safety, especially overcharge characteristics.

Cathode active material for lithium secondary batteries with core of lithium metal oxide and shell of lithium iron phosphate oxide, method of preparing the same, and lithium secondary batteries comprising the same

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.

Cathode active material for lithium secondary batteries, method for preparing the same, and lithium secondary batteries comprising the same

A cathode active material for a lithium secondary battery includes a lithium metal oxide secondary particle core formed by agglomerating lithium metal oxide primary particles; and a shell formed by coating the secondary particle core with barium titanate and metal oxide. This cathode active material allows making a lithium secondary battery having improved safety, particularly in thermal stability and overcharging characteristics.

Cathode active material for lithium secondary batteries with high safety, method of preparing the same and lithium secondary batteries comprising the same

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Incheon, South Korea

Seong-Bae Kim