Positive electrolyte active material for secondary battery, preparation method thereof, and lithium secondary battery including same
AssigneeLG Energy Solution, Ltd.
InventorsSang Min Park, Ji Hye Kim, Tae Gu Yoo, Wang Mo Jung, Gi Beom Han
Life of this patent
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Abstract
A lithium composite transition metal oxide includes nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium composite transition metal oxide includes two or more elements selected from the group consisting of Zr, Al, V, Co, and Mg and additional two or more elements selected from the group consisting of Ti, Y, Sr, Nb, Ba, and Ca, and the lithium composite transition metal oxide is in a form of a particle having a crystallite size of 170-300 nm.
Claims15
A positive electrode active material for a secondary battery, the material being a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein
- the lithium composite transition metal oxide includes two or more kinds of first dopants selected from the group consisting of Zr, Al, V, Co, and Mg and two or more kinds of second dopants selected from the group consisting of Ti, Y, Sr, Nb, Ba, and Ca,
- wherein the first dopants are contained in the total content of 2,000 ppm to 6,000 ppm, and the second dopants are contained in the total content of 500 ppm to 3,000 ppm.
A method for preparing a positive electrode active material for a secondary battery, the method comprising:
- mixing a positive electrode active material precursor including nickel (Ni), cobalt (Co), and manganese (Mn), a lithium raw material, and at least two kinds of first dopant raw materials selected from the group consisting of Zr, Al, V, Co, and Mg, and subjecting the mixture to primary firing;
- and
- after the primary firing, mixing at least two kinds of second dopant raw materials selected from the group consisting of Ti, Y, Sr, Nb, Ba, and Ca, and subjecting the mixture to secondary firing, wherein the first dopant raw materials are mixed such that a total content of the first dopants based on the total weight of the positive electrode active material is 2,000 ppm to 6,000 ppm and
- the second dopant raw materials are mixed such that a total content of the second dopants based on the total weight of the positive electrode active material is 500 ppm to 3,000 ppm.
Dependencies are inferred from the claim text.