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Abstract

A method of preparing a positive active material involves mixing a nickel compound, a cobalt compound, and optionally a metal compound to obtain a first mixture, subjecting the first mixture to a co-precipitation reaction to obtain a first resulting product, washing with water, filtering and drying the first resulting product to prepare a transition metal hydroxide precursor, subjecting the transition metal hydroxide precursor to a primary heat treatment to prepare a transition metal composite oxide precursor, mixing the transition metal composite oxide precursor and a dehydrated lithium salt to obtain a second mixture, and performing a secondary heat treatment on the second mixture to prepare a nickel-based lithium transition metal oxide. The dehydrated lithium salt is prepared by drying a hydrated lithium salt having an average particle diameter (D₅₀) of about 400-600 μm and then pulverizing the resultant to have a D₅₀ of about 3-30 μm.

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First Claim