POSITIVE ELECTRODE ACTIVE MATERIAL AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

The present invention provides a positive electrode active material comprising a lithium nickel-based oxide expressed in Chemical Formula 1, wherein said lithium nickel-based oxide has nickel contents of 40% or higher to the whole of transition metals, and has a surface on which a first coating layer is formed, and a second coating layer is formed on the first coating layer. The first coating layer consists of a compound (non-reactive material) selected from a group consisting of an oxide, a nitride, and a sulfide which have no reactivity to an electrolyte, and a mixture thereof or a composite thereof, and the second coating layer consists of a carbon-based material.