Lithium cobalt-based cathode active material, production method therefor, cathode and secondary battery comprising same
A positive electrode active material and lithium secondary battery technology, which is applied in the direction of secondary batteries, lithium batteries, active material electrodes, etc., can solve the problems of degradation of cycle characteristics and achieve excellent cycle characteristics
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[0045] Preparation method of lithium cobalt positive electrode active material
[0046] Next, a method for preparing the lithium cobalt-based positive electrode active material according to the present invention will be described.
[0047] The preparation method of the lithium-cobalt-based positive electrode active material according to the present invention comprises: (1) mixing a cobalt precursor containing sodium and calcium with a lithium raw material to prepare a mixture; and (2) firing the mixture to prepare a lithium-cobalt-based positive electrode active material.
[0048] First, a cobalt precursor containing sodium and calcium is prepared. At this time, it is preferable that the cobalt precursor contains sodium and calcium in an amount of 600 ppm or less, preferably 50 ppm to 600 ppm, more preferably 50 ppm to 400 ppm, based on the total weight of the cobalt precursor. When the content of sodium and calcium in the cobalt precursor satisfies the above range, a posi...
Embodiment 1
[0094] 80.27 g of the cobalt precursor Co containing 305 ppm of sodium and calcium based on the total weight of the cobalt precursor 3 o 4 and 18.47 g of Li 2 CO 3 (lithium raw materials) were mixed, and then the mixture was fired at 1050° C. for 10 hours to prepare a lithium cobalt positive electrode active material. The total amount of sodium and calcium in the prepared lithium-cobalt-based positive electrode active material is 250 ppm based on the total weight of the lithium-cobalt-based positive electrode active material.
Embodiment 2
[0096] To 80.27 g of the cobalt precursor Co containing 120 ppm of sodium and calcium based on the total weight of the cobalt precursor 3 o 4 and 18.47 g of Li 2 CO 3 (Lithium raw material) was additionally mixed with 23 mg of sodium carbonate and 12.5 mg of calcium carbonate, and then the mixture was fired at 1050° C. for 10 hours to prepare a lithium cobalt positive electrode active material. The contents of additionally introduced sodium and calcium are about 120 ppm and 60 ppm based on the total weight of the cobalt precursor, and about 100 ppm and 50 ppm based on the total weight of the lithium-cobalt positive electrode active material. The total amount of sodium and calcium in the prepared lithium-cobalt-based positive electrode active material is 250 ppm based on the total weight of the lithium-cobalt-based positive electrode active material.
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