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AssigneeLG Chem, Ltd.
InventorsHong-Kyu Park, Yong Hoon Kwon, Seong Yong Park, Jin On Kim, Ki Young Lee
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This invention relates to complex lithium metal oxides, which are cathode active materials of a lithium or lithium ion secondary battery with enhanced cycle life and safety, and a process for preparation thereof. The core particles are complex lithium metal oxides capable of absorbing, storing and emitting lithium ions, and a coating layer comprised of amorphous complex lithium cobalt oxides that are formed on the surface of the core particle, which is structurally stable and inactive with electrolytes. Because the amorphous complex lithium cobalt oxides are inactive with electrolytes, the oxides stabilize the surface structure of the complex lithium metal oxide and improve on high temperature storage properties, as well as safety and cycle life.
Coated complex lithium metal oxides in which the complex lithium metal oxide core particles are coated with amorphous complex lithium cobalt oxides, the core particles are complex lithium metal oxides having a voltage of 3.0V or more for lithium or complex lithium cobalt oxides such as LiCoO2, a coating layer of the core particles is amorphous oxides comprising complex lithium cobalt oxides of formula Li1+xCo1−x−yAyO2, wherein 0≦x≦0.1, 0≦y≦0.5, and A is at least one selected from the group consisting of Al, B, Mg, Ca, Sr, Ba, Na, Cr, Gd, Ga, Ni, Co, Fe, V, Cr, Ti, Sn, Mn, Zr and Zn.
Dependencies are inferred from the claim text.