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.

Abstract: A positive electrode active material, a method of preparing the same, and a positive electrode and rechargeable lithium battery including the same, the positive electrode active material including core particles including a layered lithium nickel-manganese-based composite oxide; and a coating layer located on the surface of the core particle and containing aluminum and zinc.

Abstract: A method performed by an apparatus in a wireless local area network (WLAN) is provided. The method comprises: transmitting a first physical layer convergence protocol (PLCP) protocol data unit (PPDU) for a first variant including a first control field and a second PPDU for a second variant including a second control field in A(aggregated)-PPDU, wherein the second PPDU for the second variant is transmitted in duplicate (DUP) mode; and receiving a first response to the first PPDU and a second response to the second PPDU in A-PPDU based on the first control field and the second control field, respectively, wherein the first variant is based on a first protocol standard and the second variant is based on a second protocol standard, and wherein the second protocol standard is beyond version of the first protocol standard.

Abstract: A positive electrode active material, a method of preparing the same, a positive electrode, and a rechargeable lithium battery including the same are disclosure. The positive electrode active material includes core particles including a layered lithium nickel-manganese-based composite oxide having a nickel content (e.g., amount) of greater than or equal to about 60 mol % based on 100 mol % of a total metal in the positive electrode active material excluding lithium, and a coating layer located on the surface of the core particles and containing Al, wherein an Al content (e.g., amount) of the coating layer is about 0.5 mol % to about 1.5 mol % based on 100 mol % of a total metal in the layered lithium nickel-manganese-based composite oxide excluding lithium, and the coating layer has a fiber shape (e.g., in a form of fibers, having a fibrous structure, etc.).

Abstract: Disclosed are a positive electrode active material, a positive electrode including the same, and a rechargeable lithium battery, the positive electrode active material includes a first positive electrode active material including a layered lithium nickel-manganese-based composite oxide and a second positive electrode active material including a lithium-manganese rich composite oxide in which a molar ratio of lithium to a total metal excluding lithium is about 1.1 to about 3 and a manganese content is greater than or equal to about 60 mol % based on 100 mol % of a total metal excluding lithium in the lithium-manganese rich composite oxide.

Abstract: A positive electrode active material includes a plurality of core particles including a layered lithium nickel-manganese-based composite oxide having a nickel content (e.g., amount) of greater than or equal to about 60 mol % based on 100 mol % of a total metal composition of the lithium nickel-manganese-based composite oxide excluding lithium, and a coating layer located on the surface of the core particle and containing Al and Ti. Also disclosed are a method of preparing the positive electrode active material, and a positive electrode and rechargeable lithium battery including the same.

Abstract: A method and a system for implementing a task assistant are provided. The method according to some embodiments may include receiving a user's command including a task description regarding a target task, generating a screen description by analyzing a screen of a task execution device, configuring a first prompt for determining a first action associated with the target task based on the task description and the screen description, determining the first action by inputting the first prompt to a generative model and executing the first action through the task execution device.

Abstract: Disclosed are a positive electrode active material, a method of preparing the same, a positive electrode, and a rechargeable lithium battery, the positive electrode active material including core particles including a layered lithium nickel-manganese-based composite oxide having a nickel content of greater than or equal to about 60 mol % based on 100 mol % of a total metal excluding lithium in the layered lithium nickel-manganese-based composite oxide, and a coating layer on the surface of the core particle and including Al, wherein an Al content based on a total of 100 at % of Ni, Mn, and Al on a surface of the positive electrode active material is about 20 at % to about 33 at %.

Abstract: A method performed by an apparatus in a wireless local area network (WLAN) is provided. The method includes: transmitting a first NDP Announcement frame for a first variant and a second NDP Announcement frame for a second variant in A-PPDU transmission, wherein the first NDP Announcement frame for the first variant and the second NDP Announcement frame for the second variant have a same time duration and are transmitted in different frequency bands; and transmitting at least one Sounding NDP for the first variant for both at least one first STA for the first variant and at least one second STA for the second variant, wherein the first variant is based on a first protocol standard and the second variant is based on a second protocol standard, and wherein the second protocol standard is beyond version of the first protocol standard.

Abstract: A positive electrode active material includes a core particle including a layered lithium nickel-manganese-based composite oxide, a first coating layer provided on the surface of the core particle and including Al, and a second coating layer provided on the first coating layer and including Ni. A method for preparing a positive electrode active material includes: mixing a layered nickel-manganese composite hydroxide and a lithium raw material and performing a first heat treatment to obtain a lithium nickel-manganese-based composite oxide, adding an aluminum (Al) raw material to an aqueous solvent, adding the lithium nickel-manganese composite oxide thereto and mixing them, then adding a nickel (Ni) raw material and mixing them, and drying the mixture and performing a second heat treatment.

Abstract: Disclosed are a positive electrode active material, a method of preparing the same, and a positive electrode and a rechargeable lithium battery including the same, the positive electrode active material including core particles including a layered lithium nickel-manganese-based composite oxide, a first coating layer on a surface of the core particles and containing Al, and a second coating layer on the first coating layer and containing Co.

Abstract: A positive electrode active material, a method of preparing the same, a positive electrode and a rechargeable lithium battery including the same are disclosed. The positive electrode active material includes core particles including a layered lithium nickel-manganese-based composite oxide, a first coating layer disposed on a surface of the core particles and containing Al, and a second coating layer disposed on the first coating layer and containing Mn.