Method for preparing positive electrode active material for lithium secondary battery, positive electrode active material for lithium secondary battery, and lithium secondary battery including same
AssigneeL&F Material Co., Ltd.
InventorsSu An Choi, Seung Won Lee, Sang-Hoon Jeon
Life of this patent
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Abstract
Disclosed are a method for preparing a positive electrode active material for a lithium secondary battery and a positive electrode active material for a lithium secondary battery, the method including: preparing a mixture of a precursor represented by Chemical Formula 1 below, a lithium composite oxide represented by Chemical Formula 2 below and capable of intercalating/deintercalating lithium ions, and a lithium feed material; and firing the prepared mixture: A(OH)2-a [Chemical Formula 1] Li[LizA(1-z-a)Da]EbO2-b [Chemical Formula 2]
Claims15
A method for preparing a positive electrode active material for a lithium secondary battery, the method comprising:
- preparing a mixture of a precursor represented by Chemical Formula 1 below, a lithium composite oxide represented by Chemical Formula 2 below and capable of intercalating/deintercalating lithium ions, and a lithium feed material;
- and
- firing the prepared mixture:
- A(OH)2-a [Chemical Formula 1]
- wherein in Chemical Formula 1, A=NiαCoβMnγ;
- and −0.3≦a≦0.3, 0.6≦α≦0.75, 0.15≦β≦0.30, and 0.10≦γ≦0.20,
- Li[LizA(1-z-a)Da]EbO2-b [Chemical Formula 2]
- wherein in Chemical Formula 2, A=NiαCoβMnγ;
- D is at least one element selected from the group consisting of Mg, Al, B, Zr, and Ti;
- E is at least one element selected from the group consisting of P, F, and S;
- and −0.05≦z≦0.1, 0≦a≦0.05, 0≦b≦0.05, 0.35≦α<0.52, 0.12≦β≦0.29, and 0.36≦γ≦0.53.
A positive electrode active material for a lithium secondary battery, the positive electrode active material comprising:
- a lithium composite oxide represented by Chemical Formula 5 below and capable of intercalating/deintercalating lithium ions;
- and a lithium composite oxide represented by Chemical Formula 2 below and capable of intercalating/deintercalating lithium ions,
- wherein the lithium composite oxide represented by Chemical Formula 5 below and capable of intercalating/deintercalating lithium ions is prepared from a precursor, and
- wherein the surface Ni content of the lithium composite oxide represented by Chemical Formula 5 below and capable of intercalating/deintercalating lithium ions is further reduced than the surface Ni content of a lithium composite oxide prepared by firing the precursor alone:
- Li[LizA(1-z-a)Da]EbO2-b [Chemical Formula 5]
- wherein in Chemical Formula 5, A=NiαCoβMnγ;
- D is at least one element selected from the group consisting of Mg, Al, B, Zr, and Ti;
- E is at least one element selected from the group consisting of P, F, and S;
- and −0.05≦z≦0.1, 0≦a≦0.05, 0≦b≦0.05, 0.6≦α<0.75, 0.15≦β≦0.30, and 0.10≦γ≦0.20, and
- Li[LizA(1-z-a)Da]EbO2-b [Chemical Formula 2]
- wherein in Chemical Formula 2, A=NiαCoβMnγ;
- D is at least one element selected from the group consisting of Mg, Al, B, Zr, and Ti;
- E is at least one element selected from the group consisting of P, F, and S;
- and −0.05≦z≦0.1, 0≦a≦0.05, 0≦b≦0.05, 0.35≦α<0.52, 0.12≦β≦0.29, and 0.36≦γ≦0.53.
Dependencies are inferred from the claim text.