Positive active material for rechargeable lithium battery, method of preparing the same and rechargeable lithium battery including the same
AssigneeSamsung SDI Co., Ltd.
InventorsJongmin Kim, Donghyun Kil, Wooyoung Yang, Seung Joon Lee
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Abstract
A positive active material for a rechargeable lithium battery includes a lithium nickel-based composite oxide including a secondary particle in which a plurality of plate-shaped primary particles are agglomerated; and a lithium manganese composite oxide having at least two crystal lattice structures, wherein the secondary particle has a regular array structure in which (003) planes of the primary particles are oriented in a vertical direction with respect to the surface of the secondary particle.
Claims15
A positive active material for a rechargeable lithium battery, comprising:
- a lithium nickel-based composite oxide comprising a secondary particle in which a plurality of plate-shaped primary particles are agglomerated;
- and
- a lithium manganese composite oxide on the outermost surface of the lithium nickel-based composite oxide and having at least two crystal lattice structures,
- wherein the secondary particle has a regular array structure in which (003) planes of the primary particles are oriented in a vertical direction with respect to an outermost surface of the secondary particle.
A method of preparing a positive active material for a rechargeable lithium battery, the method comprising:
- mixing a metal hydroxide precursor and a lithium source to prepare a first mixture;
- first heat-treating the first mixture at about 750° C. to about 950° C. to prepare a first fired product comprising residual lithium;
- mixing the first fired product with a manganese-based oxide to prepare a second mixture;
- and
- second heat-treating the second mixture,
- wherein the positive active material comprises:
- a lithium nickel-based composite oxide comprising a secondary particle in which a plurality of plate-shaped primary particles are agglomerated;
- and
- a lithium manganese composite oxide having at least two crystal lattice structures,
- wherein the secondary particle has a regular array structure in which (003) planes of the primary particles are oriented in a vertical direction with respect to an outermost surface of the secondary particle.
Dependencies are inferred from the claim text.