Abstract: The present specification relates to a carbon nanotube dispersion liquid, a method for preparing same, an electrode slurry composition comprising same, an electrode comprising same, and a lithium secondary battery comprising same, the carbon nanotube dispersion liquid comprising: carbon nanotubes; a first dispersant having an amide group; and an acryl-based second dispersant having one or more functional groups selected from the group consisting of a hydroxyl group and a carboxyl group, wherein the viscosity at 25° C. and a shear rate of 15 sec?1 is 3,000 cPs or less.

Abstract: The present specification relates to a carbon nanotube dispersion liquid, a method for preparing same, an electrode slurry composition comprising same, an electrode comprising same, and a lithium secondary battery comprising same, the carbon nanotube dispersion liquid comprising carbon nanotubes; a first dispersant having an amide group; and a second dispersant having an aromatic ring, wherein the viscosity at 25° C. and a shear rate of 15 sec?1 is 2,000 cPs or less.

Abstract: The present invention relates to a welding apparatus for manufacturing a secondary battery and a welding method using the same, which are capable of preventing deformation of a product due to a pressure applied in all directions or non-uniform welding due to non-uniform pressing to a cover during a process of sealing and fixing the cover to an opening of a main body casing at the time of manufacturing a secondary battery.

Abstract: The present disclosure relates to a carbon nanotube dispersion including carbon nanotubes, a first dispersant having an amide group, a second dispersant having at least one functional group selected from the group consisting of hydroxyl and carboxyl groups, and sulfur. The present disclosure also relates to a method of preparing the dispersion, an electrode slurry composition including the dispersion, an electrode including the electrode slurry composition, and a secondary battery including the electrode.

Abstract: A welding device welds an electrode tab protruding from an electrode assembly of a button-type battery to a can of the button-type battery. The welding device includes a base to support a bottom surface of the can when an inner surface of the can faces an upper side, and the electrode tab is in contact with the inner surface of the can; a jig on the base to fix the electrode tab on the base and having an opening hole through which a laser light for welding the electrode tab to the can passes; a laser irradiation device to irradiate the laser light to the opening hole when the jig fixes the electrode tab to the can; and four probes on the base or the jig. Two probes of the probes are connected to a power source, and the remaining two probes are connected to a voltmeter.

Abstract: A welding apparatus is provided for a secondary battery having an electrode assembly with a center hole seated on a lower can. The welding apparatus includes a jig which includes an insertion portion that has a pipe shape and a diameter enabling entry into the center hole of the electrode assembly and a seating portion that has an enlarged diameter of a disk shape on an end of the insertion portion; and a laser irradiation apparatus to emit a laser beam into a hole of the insertion portion. When the electrode assembly is seated on the lower can such that an electrode tab of the electrode assembly is placed within the center hole, the laser irradiation apparatus performs a weld between the inner bottom surface of the lower can and the electrode tab after passing through the hole of the insertion portion of the jig.

Abstract: A method for manufacturing a secondary battery includes preparing a lower can having an accommodation part to accommodate an electrode assembly, and an upper cover covering an upper opening of the lower can; gripping an end of a lower can circumferential portion and an end of an upper cover circumferential portion at upper and lower portions using upper and lower jigs to weld the lower can circumferential portion extending outward from an edge of the accommodation part to the upper cover circumferential portion that is a circumferential area of the upper cover; and irradiating a laser onto a bonding portion at which the lower can circumferential portion and the upper cover circumferential portion are welded to each other. In the irradiating, a height of the accommodation part is higher than a height of the end of the lower can circumferential portion.

Abstract: A laser cutting apparatus includes a lower jig configured to support a lower portion of a first side of a cutting region of an object to be cut by a laser beam, an upper jig configured to support an upper portion of the first side of the cutting region of the object, a laser nozzle configured to emit the laser beam towards the cutting region of the object, and a spatter block jig locatable between a body part of the object and the cutting region of the object.

Abstract: A button-type secondary battery includes an electrode assembly in which electrodes and separators are alternately layered; a can case having an internal accommodation space in which the electrode assembly is accommodated; and an electrode tab having one side connected to each of the electrodes of the electrode assembly and the other side welded to the can case. A welding pattern appearing at a welding part, at which the electrode tab is welded to the can case, includes a circular shape and an additional shape in addition to the circular shape.

Abstract: Disclosed are an electronic device and a control method for providing a security screen. In an electronic device according to various embodiments of the present document, when a specific application-associated event occurs in the electronic device while the electronic device is being connected to an external electronic device, a notification of event-associated information except for privacy information is provided through the external electronic device, so that a situation in which the privacy information stored in the electronic device is exposed to another user can be prevented.

Abstract: Disclosed are an electronic device and a control method for providing a security screen. In an electronic device according to various embodiments of the present document, when a specific application-associated event occurs in the electronic device while the electronic device is being connected to an external electronic device, a notification of event-associated information except for privacy information is provided through the external electronic device, so that a situation in which the privacy information stored in the electronic device is exposed to another user can be prevented.

Abstract: The present invention relates to a method of producing hollow carbon capsules which can simply and effectively produce hollow carbon capsule by using polymer particles as soft templates and using a spray-drying method.

Abstract: Provided are a porous silicon-carbon composite, which includes a core including a plurality of active particles, a conductive material formed on at least a portion of surfaces of the active particles, first pores, and second pores, and a first shell layer which is coated on the core and includes graphene, wherein the active particles include a plurality of silicon particles, silicon oxide particles, or a combination thereof, the first pores are present in the core and are formed by agglomeration of the plurality of active particles, and the second pores are irregularly dispersed and present in the core, has an average particle diameter smaller than an average particle diameter of the active particles, and are spherical, a method of manufacturing the same, and a negative electrode and a lithium secondary battery including the porous silicon-carbon composite.

Abstract: The present invention relates to a high pressure homogenizer and a method for manufacturing graphene using the same, and according to one aspect of the present invention, there is provided a high pressure homogenizer comprising a channel module which comprises a microchannel through which an object for homogenization passes, wherein the channel module comprises at least one baffle disposed so as to partition the microchannel into a plurality of spaces and the baffle is provided so as to partition the microchannel into two spaces along the width direction or the height direction.

Abstract: The present invention relates to a high pressure homogenizer and a method for manufacturing graphene using the same, and according to one aspect of the present invention, there is provided a high pressure homogenizer comprising a channel module which comprises a microchannel through which an object for homogenization passes, wherein the channel module comprises at least one baffle disposed so as to partition the microchannel into a plurality of spaces and the baffle is provided so as to partition the microchannel into two spaces along the width direction or the height direction.

Abstract: Disclosed herein are a preparation method of graphene, capable of easily preparing a graphene flake having a smaller thickness and a large area, and a dispersed composition of graphene obtained using the same. The preparation method of graphene includes applying a physical force to dispersion of a carbon-based material including graphite or a derivative thereof, and a dispersant, wherein the dispersant includes a mixture of plural kinds of polyaromatic hydrocarbon oxides, containing the polyaromatic hydrocarbon oxides having a molecular weight of 300 to 1000 in a content of 60% by weight or more, and the graphite or the derivative thereof is formed into a graphene flake having a thickness in nanoscale under application of a physical force.

Abstract: A method of forming a substrate assembly includes preparing a substrate in a chamber, combining a solid-state nitrogen source and a boron source on the substrate, forming a metal layer on a surface of the substrate including the combined solid-state nitrogen and boron sources, and forming a first hexagonal boron nitride sheet directly bonded to the surface of the substrate by performing a heat treatment on the substrate including the metal layer and the combined solid-state nitrogen and boron sources.

Abstract: The present invention relates to a conducting material composition capable of forming an electrode in which at least two kinds of carbon based materials are contained in a uniformly dispersed state to enable a battery such as a lithium rechargeable battery having more improved electrical and lifetime characteristics to be provided, and a slurry composition for forming an electrode of a lithium rechargeable battery and a lithium rechargeable battery using the same. The conducting material composition contains: at least two kinds of conductive carbon-based materials selected from the group consisting of carbon nano tube, graphene, and carbon black; and a dispersant containing a plurality kinds of poly aromatic hydrocarbon oxides, wherein the dispersant contains poly aromatic hydrocarbon oxides having a molecular weight of 300 to 1000 at a content of 60 wt.% or more.

Abstract: The present invention relates to a method of producing hollow carbon capsules which can simply and effectively produce hollow carbon capsule by using polymer particles as soft templates and using a spray-drying method.

Abstract: A substrate assembly includes a first hexagonal boron nitride sheet directly bonded to a surface of a substrate, and a metal layer on the first hexagonal boron nitride sheet.