Lg Chem, Ltd

Lg Energy Solution, Ltd.

Hyun Jin Oh

Wang Mo Jung

Dong Hun Lee

Ho Suk Shin

Joo Hong Jin

Jin Hyung Lim

Sin Young Park

Sung-Kyun Chang

In Sung Uhm

Jung Min Han

Won Seok Chang

Jinhyung Lim

Disclosed are a transition metal precursor for preparation of a lithium transition metal oxide, in which a ratio of tap density of the precursor to average particle diameter D50 of the precursor satisfies the condition represented by Equation 1 below, and a lithium transition metal oxide prepared using the same. 

Transition metal precursor having low tap density and lithium transition metal oxide having high particle strength

The present disclosure relates to a positive electrode active material which reduces lithium by-products and improves structural stability and includes a lithium-nickel based transition metal composite oxide in which an alkaline earth metal having oxidation number of +2 is doped and a phosphate coated layer formed on the outer surface of the composite oxide. Accordingly, a second battery including the positive electrode active material has excellent capacity characteristics, and also improves structural stability during charging/discharging and prevents swelling, thereby being capable of exhibiting excellent life characteristics. Therefore, the present invention may be easily applied to industry in need thereof, and particularly to electric vehicles industry requiring high capacity and long-term life characteristics.

Lithium-nickel based positive electrode active material, method of preparing the same, and lithium secondary battery including the same

Provided are a method of preparing a cathode active material including coating a surface of a lithium transition metal oxide with a lithium boron oxide by dry mixing the lithium transition metal oxide and a boron-containing compound and performing a heat treatment, and a cathode active material prepared thereby. A method of preparing a cathode active material according to an embodiment of the present invention may easily transform lithium impurities present in a lithium transition metal oxide into a structurally stable lithium boron oxide by performing a heat treatment near the melting point of a boron-containing compound. Also, a coating layer may be formed in which the lithium boron oxide is uniformly coated in an amount proportional to the used amount of the boron-containing compound even at a low heat treatment temperature.

Cathode active material for lithium secondary battery

Manufacturing method of cathode active material, and cathode active material for lithium secondary battery manufactured thereby

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Daejeon, South Korea

Hyun Jin Oh