Composite positive electrode active material for lithium ion battery, preparing method thereof, an

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Nickel rich (nickel rich) lithium nikkel-based compounds where the content of nickel is 50 to 100 mol% based on the total amount of transition metal; And a lithium ion cell containing a lithium ion electrode active material, a combination of a lithium ion cell comprising a coating film comprising a rare earth metal hydroxide (rare earth metal hydroxide) formed on the surface of the nickel-rich lithium-nikkel-based compound, a production method thereof and an anode containing it is presented.