Positive electrode active material for lithium secondary battery and method of preparing the positive electrode active material
AssigneeLG Energy Solution, Ltd.
InventorsSo Ra Baek, Gi Beom Han, Sang Wook Lee, Hak Yoon Kim, Jung Min Han, Wang Mo Jung
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Abstract
A positive electrode active material includes a lithium transition metal oxide, which is in the form of a secondary particle formed by aggregation of primary particles and is represented by Formula 1, wherein the lithium transition metal oxide has a crystalline size of 160 nm or less and an average particle diameter of the primary particle of 0.6 μm or more. A preparation method thereof is also provided.
Claims9
A positive electrode active material comprising a lithium transition metal oxide which is in a form of a secondary particle formed by aggregation of primary particles, wherein the lithium transition metal oxide is represented by Formula 1,
- wherein the lithium transition metal oxide has a crystalline size of 160 nm or less and an average particle diameter of the primary particle of 0.6 μm or more:
- Li1+aNixCoyM1zBwO2 [Formula 1]
- wherein, in Formula 1,
- M1 comprises at least one of manganese (Mn), and
- 0≤a≤0.5, 0.5≤x<1.0, 0<y≤0.4, 0<z≤0.4, and 0<w≤0.05,
- wherein the boron (B) is included in an amount of 0.02 part by weight to 0.3 part by weight based on 100 parts by weight of the lithium transition metal oxide.
A method of preparing a positive electrode active material, the method comprising:
- mixing a transition metal hydroxide precursor, a lithium raw material, and a boron (B)-containing raw material and sintering at 760° C. to 840° C. to prepare a boron (B)-doped lithium transition metal oxide,
- wherein the boron (B)-doped lithium transition metal oxide is represented by Formula 1 and has a crystalline size of 160 nm or less and an average particle diameter of primary particles of 0.6 μm or more:
- L1+aNixCoyM1zBwO2 [Formula 1]
- wherein, in Formula 1,
- M1 is manganese (Mn), and
- 0≤a≤0.5, 0.5≤x<1.0, 0<y≤0.4, 0<z≤0.4, and 0<w≤0.1,
- wherein the transition metal hydroxide precursor and the boron (B)-containing raw material are mixed in amounts such that a total number of moles of transition metals:
- a number of moles of boron is in a range of 0.97:0.03 to 0.998:0.002.
Dependencies are inferred from the claim text.