Lg Chem, Ltd

Joo-Hong Jin

Hong-Kyu Park

Sung-Joong Kang

Ho-Suk Shin

Sang-Min Park

Byung-Chun Park

Dae-Jin Lee

Provided herein is a precursor of a transition metal oxide, including a core unit and a shell unit, wherein the core unit includes a compound of chemical formula 1 below, and the shell unit includes a compound of chemical formula 2 below.NiMnCoM[OH]A&#x2003;&#x2003;[Chemical formula 1]NiMnCoM'[OH]A&#x2032;&#x2003;&#x2003;[Chemical formula 2]

Precursor of transition metal oxide, preparation method thereof, lithium composite transition metal oxide, and positive electrode and secondary battery including the same

The present invention provides a method for treating the particle surface of a cathode active material for a lithium secondary battery, the method comprising (a) preparing a cathode active material having a lithium compound; (b) generating a plasma from a gas comprising at least one of a fluorine-containing gas and a phosphorus-containing gas as a part of a reactive gas; and (c) removing lithium impurities present on the particle surface of the cathode active material with the plasma. In accordance with the present invention, the amount of the lithium impurities present on the particle surface of the cathode active material can be reduced to suppress a side reaction of the lithium impurities and an electrolyte.

Surface-treatment method of cathode active material and cathode active material formed therefrom

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Daejeon, South Korea

Joo-Hong Jin