Abstract: A method for preparing a positive electrode active material may include: (i) adding an aluminum raw material and sodium hydroxide to an aqueous (e.g., water-soluble) solvent to prepare a coating solution having a pH range of about 12.5 to about 14; (ii) adding core particles including a lithium nickel-based composite oxide to the coating solution to prepare a first mixed solution; (iii) adding a cobalt raw material to the first mixed solution to prepare a second mixed solution; and (iv) drying and heat-treating the second mixed solution to obtain a positive electrode active material.

Abstract: A positive electrode active material includes a first positive electrode active material including a first lithium nickel-cobalt-based composite oxide doped with at least one of B, W, Y, and Mo, the first positive electrode active material being in a form of secondary particles that are formed by agglomerating a plurality of primary particles are agglomerated, with at least a portion of the primary particles having a radial arrangement structure. The positive electrode active material also includes a second positive electrode active material including a second lithium nickel-cobalt-based composite oxide doped with at least one of Zr, Sr, Ce, and Ta, with the second positive electrode active material being in a form of single particles.

Abstract: A positive electrode active material includes: core particles including a lithium nickel-based composite oxide having a nickel content (e.g., amount) of at least about 80 mol % based on 100 mol % of a total metal excluding lithium in the lithium nickel-based composite oxide; and a coating layer disposed on a surface of each core particle and including aluminum, wherein the core particles are each in a form of a secondary particle in which a plurality of primary particles is agglomerated, an aluminum content (e.g., amount), based on total 100 at % of nickel, cobalt, and aluminum is about 10 at % to about 15 at % as measured by energy profiling energy dispersive spectroscopy (EP-EDS) on a surface of a positive electrode active material particle including the core particle and the coating layer.

Abstract: A method for preparing a positive electrode active material may include (i) preparing core particles including a lithium nickel-based composite oxide; (ii) adding the core particles to an aqueous (e.g., water-soluble) solvent and mixing them to prepare a first mixed solution, and adjusting pH of the first mixed solution to a range between about 5.5 and about 7.5; (iii) adding an aluminum raw material to the first mixed solution and mixing them to prepare a second mixed solution; and (iv) removing an aqueous (e.g., water-soluble) solvent from the second mixed solution to prepare a dried product. The positive electrode active material and the rechargeable lithium battery that are prepared by using the method for preparing the positive electrode active material may exhibit high initial charge/discharge capacity and high efficiency even under high-voltage driving conditions and may implement long cycle-life characteristics under high-voltage and high-temperature conditions.

Abstract: Disclosed are a positive electrode active material including core particles including a layered lithium nickel-manganese-based composite oxide; and an yttrium-containing coating layer on the surface of the core particles; wherein an yttrium content on the surface of the positive electrode active material, as measured by energy profiling energy dispersive spectroscopy (EP-EDS), is about 0.1 at % to about 5.0 at % based on 100 at % of the total metal excluding lithium, and the positive electrode active material according to some example embodiments may maximize or increase capacity, while minimizing or reducing a production cost, to ensure long cycle-life characteristics and improve high-voltage characteristics and high-temperature characteristics.

Abstract: Disclosed are a positive electrode active material for a rechargeable lithium battery, a positive electrode, and a rechargeable lithium battery, the positive electrode active material for a rechargeable lithium battery including large particles including a first lithium nickel-based composite oxide and small particles including a second lithium nickel-based composite oxide, wherein a nickel content based on 100 mol % of a total metal excluding lithium is greater than or equal to about 80 mol %, a ratio of a weight of the first lithium nickel-based composite oxide and a weight of the second lithium nickel-based composite oxide in the positive electrode active material is about 1 to about 4, a span of the first lithium nickel-based composite oxide is about 0.9 to about 1.2, a span of the second lithium nickel-based composite oxide is about 0.9 to about 1.2, and a span of the positive electrode active material is about 1.5 to about 2.

Abstract: A positive electrode includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer including a positive electrode active material. The positive electrode active material includes core particles including a layered lithium nickel-manganese-based composite oxide including about 0.1 mol % to about 2 mol % of cobalt based on 100 mol % of a total metal content in the layered lithium nickel-manganese-based composite oxide, excluding lithium, and an aluminum coating layer on the surface of the core particles, wherein, in a dQ/dV graph of voltage during standard charging and discharging, evaluated under a constant current of 0.2 C, an applied current of 0.5 mA to 0.7 mA, and where 1 C=200 mAh/g, a point where a tangent line drawn at a first inflection point meets the line where dQ/dV=0 is in a voltage range of about 3.68 V to about 3.70 V.

Abstract: Provided are a positive electrode active material, and a method of preparing the positive electrode active material, and a positive electrode including the positive electrode active material, and a rechargeable lithium battery including the positive electrode active material. The positive electrode active material comprises core particles including a lithium nickel-based composite oxide and a coating layer provided on the surfaces of the core particles, with the coating layer including aluminum, yttrium, and tungsten.

Abstract: A positive electrode active material, a positive electrode, and a rechargeable lithium battery including the positive electrode are disclosed. The positive electrode active material may include a first positive electrode active material including a core particle in a form of secondary particles including a layered lithium nickel-manganese-based composite oxide and provided by agglomerating a plurality of primary particles and a second positive electrode active material including a core particle including a layered lithium nickel-manganese-based composite oxide and in a form of single particles. The first positive electrode active material and the second positive electrode active material may each independently further include an aluminum coating layer on the surface of the core particle, and an average particle diameter (D50) of the second positive electrode active material may be smaller than that of the first positive electrode active material.

Abstract: A positive electrode active material, a positive electrode and a lithium secondary battery containing the same are provided. The positive electrode active material includes a lithium nickel-based composite oxide including nickel (Ni), cobalt (Co) and aluminum (Al), and including a first region, and a second region around (e.g., surrounding) the first region. The second region may be defined as a region having a thickness of about 1 micrometer (?m) in a direction from the outermost to the center of the positive electrode active material. The content (e.g., amount) ratio of nickel to aluminum (NNi/NAl) of the second region may be about 5 to about 45.

Abstract: A positive electrode active material for rechargeable lithium batteries includes core particles including a layered lithium nickel-manganese-based composite oxide and being in a form of secondary particles, wherein the secondary particles are each an agglomeration of a plurality of primary particles; an aluminum coating layer on a surface of the core particles; and a grain boundary coating portion being located on the surface of the primary particles and including cobalt. The positive electrode active material may realize characteristics of high density, high capacity, and long cycle-life for the rechargeable lithium batteries including the positive electrode active material, and reduce an amount of high-temperature storage gas generated.

Abstract: A positive electrode active material includes a first positive electrode active material including a layered lithium nickel-manganese-based composite oxide, the first positive electrode active material being in a form of secondary particles in which a plurality of primary particles are agglomerated; a second positive electrode active material including a layered lithium nickel-manganese-based composite oxide, the second positive electrode active material having a smaller average particle diameter (D50) than the first positive electrode active material, and the second positive electrode active material being in a form of single particles; and a third positive electrode active material including a lithium-manganese-rich composite oxide in which a molar ratio of lithium to a total metal content of the lithium-manganese-rich composite oxide excluding lithium is about 1.

Abstract: A positive electrode active material includes a first positive electrode active material including a layered lithium nickel-manganese-based composite oxide, the first positive electrode active material being in a form of single particles. The positive electrode active material also includes a second positive electrode active material including a lithium-manganese-rich composite oxide in which a molar ratio of lithium to a total metal content of the lithium-manganese-rich composite excluding lithium is about 1.1 to about 3 and a manganese content based on 100 mol % of the total metal content of the lithium-manganese-rich composite excluding lithium is greater than or equal to about 60 mol %, and the second positive electrode active material being in a form of single particles. The positive electrode active material according to some embodiments maximizes capacity while minimizing production cost, ensures long cycle-life, and improves high-voltage characteristics and high-temperature storage characteristics.

Abstract: A positive electrode active material includes a first positive electrode active material including a layered lithium nickel-manganese-based composite oxide, the first positive electrode active material being in a form of secondary particles in which a plurality of primary particles are agglomerated. The positive electrode active material also includes a second positive electrode active material including a lithium-manganese-rich composite oxide in which a molar ratio of lithium to a total metal content of the lithium-manganese-rich composite oxide excluding lithium is about 1.1 to about 3 and a manganese content based on 100 mol % of a total metal content of the lithium-manganese-rich composite oxide excluding lithium is greater than or equal to about 60 mol %, and the second positive electrode active material being in a form of single particles.

Abstract: Provided is a positive electrode active material including core particles including zirconium-doped layered lithium nickel-manganese-aluminum-based composite oxide, wherein the core particle is a secondary particle formed by agglomerating a plurality of primary particles, an average particle diameter (D50) of the secondary particles is about 10 ?m to about 25 ?m, and in the zirconium-doped layered lithium nickel-manganese-aluminum-based composite oxide, a zirconium content is about 0.2 mol % to about 0.8 mol % based on 100 mol % of a total metal excluding lithium. The positive electrode active material according to some embodiments may maximize capacity, while minimizing a production cost, to ensure long cycle-life characteristics and improve high-voltage characteristics and high-temperature characteristics.

Abstract: A positive electrode active material including core particles including layered lithium nickel-manganese-based composite oxide, wherein each core particle is a secondary particle formed by agglomerating a plurality of primary particles, and a crystal size of the primary particle is about 105 nm to about 115 nm.

Abstract: A rechargeable lithium battery including a positive electrode including a positive electrode active material, the positive electrode active material including a first positive electrode active material that includes a layered lithium nickel-manganese-based composite oxide and is in a form of secondary particles formed, the secondary particles including a plurality of primary particles, and an average particle diameter (D50) of the secondary particles is about 10 ?m to about 25 ?m, and a second positive electrode active material that includes a layered lithium nickel-cobalt-based composite oxide and is in a form of single particles, and an average particle diameter (D50) of the single particles is about 0.5 ?m to about 8 ?m.

Abstract: A positive electrode active material for rechargeable lithium batteries includes: a first positive electrode active material including a first lithium nickel-based composite oxide and being in a form of secondary particles having an average particle diameter (D50) of about 10 ?m to about 25 ?m; a second positive electrode active material including a second lithium nickel-based composite oxide and being in a form of secondary particles having an average particle diameter (D50) of about 0.5 ?m to about 8 ?m; and a third positive electrode active material including a third lithium nickel-based composite oxide and being in a form of secondary particles including a plurality of primary particles, wherein an average particle diameter (D50) of the secondary particles is about 0.5 ?m to about 8 ?m, and the primary particles constituting the secondary particles of the third positive electrode active material are needle-shaped.

Abstract: A method of preparing a positive electrode active material, and a rechargeable lithium battery including a positive electrode active material prepared therefrom are provided, the method including adding lithium hydroxide, nickel sulfate, cobalt sulfate, and ammonium carbonate to an aqueous solvent and mixing them to prepare a raw material mixture, wet-pulverizing the raw material mixture, spray-drying the pulverized material to obtain a positive electrode active material precursor mixture, and subjecting the positive electrode active material precursor mixture to heat treatment to obtain a positive electrode active material in a form of a single particle and including lithium nickel-cobalt-based composite oxide.

Abstract: A method of preparing a positive electrode active material, and a rechargeable lithium battery including a positive electrode active material prepared therefrom are provided. The method includes adding lithium carbonate, nickel carbonate, and cobalt carbonate to an aqueous solvent and mixing the lithium carbonate, the nickel carbonate, the cobalt carbonate, and the aqueous solvent to prepare a raw material mixture, wet-pulverizing the raw material mixture, spray-drying the pulverized raw material mixture to obtain a positive electrode active material precursor mixture, and subjecting the positive electrode active material precursor mixture to heat treatment to obtain a positive electrode active material in a form of single particles and including lithium nickel-cobalt-based composite oxide.