Positive electrode active material for rechargeable lithium battery, production method therefor and rechargeable lithum battery comprising same
AssigneeResearch Institute of Industrial Science & Technology
InventorsJung Hoon SONG, Sang Cheol NAM, Kwon Young CHOI
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Abstract
The present invention provides a cathode active material for a lithium secondary battery comprising secondary particles in which primary particles represented by Chemical Formula 1 below are aggregated, wherein the average particle size (D50) of the secondary particles is 2.5 μm or more and 7 μm or less, and the average value of the sphericity coefficient, which is the ratio (l/w) of the long axis length (l) to the short axis length (w) of the secondary particles, is 1.0 to 1.25.
Claims22
A cathode active material for a lithium secondary battery comprising
- secondary particles in which primary particles represented by Chemical Formula 1 below are aggregated,
- wherein the average particle size (D50) of the secondary particles is 2.5 μm or more and 7 μm or less, and
- an average value of the sphericity coefficient, which is the ratio (1/w) of the long axis length (l) to the short axis length (w) of the secondary particles, is 1.0 to 1.25:
- LiaNixCoyMn(1−x−y)O2 [Chemical Formula 1]
- in the Chemical Formula 1, 0.80≤a≤1.20, 0.33≤x≤0.90, 0≤y≤0.33, and 0<x+y<1.
A method for manufacturing a cathode active material for a lithium secondary battery, comprising:
- obtaining a precursor by co-precipitation reaction metal;
- and
- obtaining a cathode active material for a lithium secondary battery by mixing and calcining the precursor and the lithium raw material,
- wherein the co-precipitation reaction induces a co-precipitation reaction by stirring an aqueous metal salt solution including a nickel salt, a manganese salt, and a cobalt salt, ammonia, and caustic soda in a reactor, and
- the temperature in the reactor is 25 to 35° C. in the co-precipitation reaction.
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Dependencies are inferred from the claim text.