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
Estimating the term…
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]
Claims21
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, 0.5≦α≦0.64, 0.15≦β≦0.29, and 0.21≦γ≦0.35,
- 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<0.5, 0.19≦β≦0.34, and 0.31≦γ≦0.46.
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, 0.5≦α<0.64, 0.15≦β≦0.29, and 0.21≦γ≦0.35, 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<0.5, 0.19≦β≦0.34, and 0.31≦γ≦0.46.
Dependencies are inferred from the claim text.