Abstract: A positive electrode active material for a lithium secondary battery includes a lithium composite transition metal oxide including transition metals including nickel (Ni), cobalt (Co), and manganese (Mn), and the lithium composite transition metal oxide is doped with doping elements including cobalt (Co) and titanium (Ti). The lithium composite transition metal oxide includes at least one lithium layer and at least one transition metal layer including the transition metals, and the lithium layer and the transition metal layer are alternately arranged. The thickness of the lithium layer ranges from 2.146 ? to 2.182 ?, and the thickness of the transition metal layer ranges from 2.561 ? to 2.595 ?.

Abstract: A positive electrode active material precursor includes Ni and Mn and secondary particles formed by the aggregation of a plurality of primary particles. The secondary particles have a ratio of a core area to a total area of the particles ranging from 28.7% to 34.1%, and a porosity ranging from 11.3% to 11.7%. Also provided is a method for preparing the positive electrode active material precursor. Additionally, a positive electrode active material including a reaction product of the positive electrode active material precursor and a lithium raw material is provided. Also provided is a method for preparing a positive electrode active material using the positive electrode active material precursor.

Abstract: A positive electrode active material includes a core including a first lithium complex metal oxide, and a shell located surrounding the core and including a second lithium complex metal oxide, and further includes a buffer layer located between the core and the shell. The buffer layer includes a pore, and a three-dimensional network structure of a third lithium complex metal oxide which is connecting the core and the shell. Accordingly, the positive electrode active material is capable of enhancing an output property and a life property by minimizing destruction of the active material caused by a rolling process during the electrode preparation, maximizing reactivity with an electrolyte liquid, and by the particles that form the shell having a crystal structure with orientation facilitating lithium ion intercalation and deintercalation.

Abstract: A method of preparing a positive electrode active material for a lithium secondary battery includes mixing a transition metal hydroxide containing transition metals including nickel (Ni), cobalt (Co) and manganese (Mn), a lithium-containing raw material and a doping raw material including at least one doping element selected from the group consisting of Al, Mg, Co, V, Ti, Zr and W and performing a first calcination treatment thereon to prepare a lithium composite transition metal oxide doped with the doping element; and mixing the lithium composite transition metal oxide and a coating raw material including at least one coating element selected from the group consisting of Al, Mg, Co, Ti, Zr and B and performing a second calcination treatment thereon to prepare a positive electrode active material in which a coating layer containing the coating element is formed on the lithium composite transition metal oxide.

Abstract: The present disclosure relates to a superconductor including magnesium diboride and a production method therefor. A superconductor having a high critical current density at a certain temperature and under a certain magnetic field may be obtained by doping magnesium diboride with liquid chloroform during the production of the superconductor.

Abstract: A positive electrode active material for a secondary battery including: a lithium complex transition metal oxide which contains nickel (Ni) and cobalt (Co), and contains at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and a composite coating portion which is formed on a surface of the lithium complex transition metal oxide is provided. The lithium complex transition metal oxide has a nickel (Ni) content of 65 mol % or more with respect to the total transition metal content, and the composite coating portion contains cobalt (Co) and boron (B), and contains at least one selected from the group consisting of lanthanum (La), titanium (Ti), and aluminum (Al).

Abstract: A positive electrode active material for a secondary battery including: a lithium complex transition metal oxide which contains nickel (Ni) and cobalt (Co), and contains at least one selected from the group consisting of manganese (Mn) and aluminum (Al); and a composite coating portion which is formed on a surface of the lithium complex transition metal oxide is provided. The lithium complex transition metal oxide has a nickel (Ni) content of 65 mol % or more with respect to the total transition metal content, and the composite coating portion contains cobalt (Co) and boron (B), and contains at least one selected from the group consisting of lanthanum (La), titanium (Ti), and aluminum (Al).

Abstract: A positive electrode active material includes a core including a first lithium complex metal oxide, and a shell located surrounding the core and including a second lithium complex metal oxide, and further includes a buffer layer located between the core and the shell. The buffer layer includes a pore, and a three-dimensional network structure of a third lithium complex metal oxide which is connecting the core and the shell. Accordingly, the positive electrode active material is capable of enhancing an output property and a life property by minimizing destruction of the active material caused by a rolling process during the electrode preparation, maximizing reactivity with an electrolyte liquid, and by the particles that form the shell having a crystal structure with orientation facilitating lithium ion intercalation and deintercalation.

Abstract: The present invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the same and a lithium secondary battery including the same, the positive electrode active material includes a core including a first lithium complex metal oxide, and a shell located surrounding the core and including a second lithium complex metal oxide, and further includes a buffer layer located between the core and the shell, wherein the buffer layer includes a pore, and a three-dimensional network structure of a third lithium complex metal oxide which is connecting the core and the shell, and accordingly, minimizing destruction of the active material caused by a rolling process during the electrode preparation, and maximizing reactivity with an electrolyte liquid.

Abstract: According to an exemplary embodiment of the present invention, provided is a method for manufacturing a superconductor including magnesium diboride, the method including: a first mixture preparation step of preparing a first mixture including a boron powder and a liquid chlorinated hydrocarbon compound; a second mixture preparation step of preparing a second mixture including the first mixture and a magnesium powder; a molded body manufacturing step of manufacturing a molded body by pressurizing the second mixture; and a sintering step of sintering the molded body to manufacture a superconductor including magnesium diboride.

Abstract: In one embodiment, a positive electrode active material for a secondary battery, the positive electrode active material being a primary particle having a monolithic structure that includes a lithium composite metal oxide of Formula 1 below, wherein the primary particle has an average particle size (D50) of 2 ?m to 20 ?m and a Brunauer-Emmett-Teller (BET) specific surface area of 0.15 m2/g to 0.5 m2/g, and wherein the positive electrode active material has a rolling density of 3.0 g/cc or higher under a pressure of 2 ton·f: LiaNi1-x-yCoxM1yM3zM2wO2??[Formula 1] in Formula 1, M1 is at least one selected from the group consisting of Al and Mn, M2 is any one or two or more elements selected from the group consisting of Zr, Ti, Mg, Ta, and Nb, M3 is any one or two or more elements selected from the group consisting of W, Mo, and Cr, and 1.0?a?1.5, 0?x?0.5, 0?y?0.5, 0.005?z?0.01, 0?w?0.04, 0<x+y?0.7.

Abstract: A method and device are provided for providing human network information. Information associated with user contacts is received from at least one external server. A first schema of the information associated with user contacts is converted into a specific schema. Relationship information related to a first user is generated based on the information associated with the user contacts converted into the specific schema. The relationship information related to the first user includes data related to the first user and data related to a relationship between the first user and other users.

Abstract: A method of preparing a positive electrode active material includes mixing a lithium raw material and a nickel-containing transition metal hydroxide precursor containing nickel in an amount of 65 mol % or more based on a total number of moles of transition metals and performing a first heat treatment to prepare a nickel-containing lithium transition metal oxide. The method also includes mixing a boron and carbon-containing raw material and a cobalt-containing raw material with the nickel-containing lithium transition metal oxide to form a mixture, and performing a second heat treatment on the mixture to form a coating material including B and Co on a surface of the lithium transition metal oxide. A positive electrode active material prepared by the preparation method is formed, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.

Abstract: Example methods and terminals for sharing content are described. In one example method, an application is activated, upon detection of an event for executing the application, on a terminal, and an application screen having at least one content is displayed. Upon detecting a touch input for selecting, at least one content is selected. Upon detecting a touch input on a transmission button on the application screen, the selected content is transmitted to an external terminal. In another example method, an application screen having at least one icon for executing function is displayed; a touch input for selecting an icon associated with content to be received from an external terminal is detected; at least one identifier broadcast by the external terminal is displayed; and content is received from the external terminal corresponding to the selected identifier, upon detection of a touch input for selecting at least one identifier.

Abstract: In one embodiment, a positive electrode active material for a secondary battery, the positive electrode active material being a primary particle having a monolithic structure that includes a lithium composite metal oxide of Formula 1 below, wherein the primary particle has an average particle size (D50) of 2 ?m to 20 ?m and a Brunauer-Emmett-Teller (BET) specific surface area of 0.15 m2/g to 0.5 m2/g, and wherein the positive electrode active material has a rolling density of 3.0 g/cc or higher under a pressure of 2 ton·f: LiaNi1-x-yCoxM1yM3zM2wO2??[Formula 1] in Formula 1, M1 is at least one selected from the group consisting of Al and Mn, M2 is any one or two or more elements selected from the group consisting of Zr, Ti, Mg, Ta, and Nb, M3 is any one or two or more elements selected from the group consisting of W, Mo, and Cr, and 1.0?a?1.5, 0?x?0.5, 0?y?0.5, 0.005?z?0.01, 0?w?0.04, 0<x+y?0.7.

Abstract: A method of preparing a positive electrode material is provided. The method includes mixing a first positive electrode active material precursor having an average particle diameter (D50) of 10 ?m to 30 ?m with a lithium-containing raw material and pre-sintering the mixture to obtain a first pre-sintered product, mixing a second positive electrode active material precursor having an average particle diameter (D50) different from that of the first positive electrode active material precursor with a lithium-containing raw material and pre-sintering the mixture to obtain a second pre-sintered product, disintegrating each of the first pre-sintered product and the second pre-sintered product, and mixing the disintegrated first pre-sintered product and the disintegrated second pre-sintered product and main-sintering the mixture to obtain a positive electrode material.

Abstract: The present invention provides a positive electrode active material for a secondary battery, the positive electrode active material being a primary particle having a monolithic structure that includes a lithium composite metal oxide of Formula 1 below, wherein the primary particle has an average particle size (D50) of 2 ?m to 20 ?m and a Brunauer-Emmett-Teller (BET) specific surface area of 0.15 m2/g to 1.9 m2/g, and a secondary battery including the same.

Abstract: A positive electrode active material for a lithium secondary battery includes a lithium composite transition metal oxide including transition metals including nickel (Ni), cobalt (Co), and manganese (Mn), and the lithium composite transition metal oxide is doped with doping elements including cobalt (Co) and titanium (Ti). The lithium composite transition metal oxide includes at least one lithium layer and at least one transition metal layer including the transition metals, and the lithium layer and the transition metal layer are alternately arranged. The thickness of the lithium layer ranges from 2.146 ? to 2.182 ?, and the thickness of the transition metal layer ranges from 2.561 ? to 2.595 ?A.

Abstract: According to an exemplary embodiment of the present invention, provided is a method for manufacturing a superconductor including magnesium diboride, the method including: a first mixture preparation step of preparing a first mixture including a boron powder and a liquid chlorinated hydrocarbon compound; a second mixture preparation step of preparing a second mixture including the first mixture and a magnesium powder; a molded body manufacturing step of manufacturing a molded body by pressurizing the second mixture; and a sintering step of sintering the molded body to manufacture a superconductor including magnesium diboride.

Abstract: An example method and a device for providing content to at least one external device are provided. The example method includes communicating with the at least one external device, displaying a plurality of contents stored in the device on a screen of the device, determining whether the at least one external device is executing an application corresponding to an application being executed in the device, and providing at least one of the displayed plurality of contents to the at least one external device, based on the determination.