Positive active material for rechargeable lithium battery, method of preparing same and rechargeable lithium battery including same
AssigneesSamsung SDI Co., Ltd., Robert Bosch GmbH
InventorsDong-Hwan YU, Gun-Ho Kwak, Sung-Hoon Kim
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Abstract
A positive active material for a rechargeable lithium battery is a secondary particle formed of an assembly of primary particles of a nickel-based compound. The positive active material has an average particle diameter ranging from 5.5 μm to 7.5 μm and a specific surface area ranging from 0.40 m2/g to 2.0 m2/g. When the positive active material has an average particle diameter ranging from 11 μm to 13 μm, the positive active material has a specific surface area ranging from 0.15 m2/g to 1.0 m2/g. A rechargeable lithium battery includes the positive active material.
Claims20
A positive active material for a rechargeable lithium battery, the positive active material comprising secondary particles including agglomerated primary particles of a nickel-based compound, and
- having a specific surface area ranging from 0.4 m2/g to 2.0 m2/g when the positive active material has an average particle diameter ranging from 5.5 μm to 7.5 μm;
- and
- having a specific surface area ranging from 0.15 m2/g to 1.0 m2/g when the positive active material has an average particle diameter ranging from 11 μm to 13 μm.
A method of preparing a positive active material for a rechargeable lithium battery, the method comprising:
- preparing a transition element composite precursor by agitating and reacting a metal-mixed liquid including a nickel compound, a cobalt compound, and a manganese compound;
- spray-drying the transition element composite precursor under a pressure greater than 0.5 MPa and less than or equal to 1.0 MPa to prepare a porous transition element composite precursor;
- mixing the porous transition element composite precursor with a lithium salt;
- and
- heat-treating the mixture.
A positive active material for a rechargeable lithium battery, the positive active material comprising secondary particles including agglomerated primary particles of a nickel-based compound, the positive active material having a specific surface area ranging from 0.4 m2/g to 2.0 m2/g and an average a particle diameter ranging from 5.5 μm to 7.5 μm.
Dependencies are inferred from the claim text.