Abstract: The present disclosure relates to a coating die for a lithium secondary battery. The coating die includes an upper die plate, a lower die plate, and a shim assembly interposed between the upper die plate and the lower die plate. The shim assembly includes a body shim and one or more spacer shims, and the spacer shims are formed to be individually removable from the coating die such that the number and position of the spacer shims are adjustable.

Abstract: An electrode insulating coating composition according to the present disclosure includes boehmite particles, a dispersant, a binder, and a non-aqueous solvent, wherein the dispersant includes a phenolic compound containing two or more aromatic rings, and is included in an amount of 1.2 to 8.8 parts by weight with respect to 100 parts by weight of the boehmite particles.

Abstract: A die for coating an insulating liquid may include a die body configured to be positioned on a current collector with a certain space and discharge an insulating liquid; and a discharge portion configured to be formed on one surface where the insulating liquid of the die body is discharged, and form a discharge path and a discharge port where the insulating liquid is discharged, wherein the discharge portion includes a first discharge portion positioned at a front region side of a coating direction of the insulating liquid, and a second discharge portion positioned at a rear region side of the coating direction of the insulating liquid, an insulating liquid discharge path is formed between the first discharge portion and the second discharge portion, and an insulating liquid discharge port is formed between an end of the first discharge portion and an end of the second discharge portion.

Abstract: Disclosed is a coating apparatus for producing an electrode, which has a reduced defect rate in the coating process. The coating apparatus includes a die unit having an inlet through which the electrode slurry is introduced and an inner space for accommodating the introduced electrode slurry; a shim unit mounted in the die unit and configured to form an outlet together with the die unit so that the electrode slurry is discharged therethrough; and a cover member configured to surround an outer surface of the die unit and the shim unit so that the electrode slurry is not leaked at the outer surface, except for the outlet.

Abstract: The present disclosure relates to a strip-like electrode for use in a cylindrical jelly roll which includes a strip-like electrode assembly wound cylindrically to form a hollow cavity at the core portion thereof, and a lithium secondary battery including the same. The strip-like electrode includes: a strip-like electrode current collector; a first electrode active material layer formed on at least one surface of the strip-like electrode current collector; and a second electrode active material layer formed on the first electrode active material layer, wherein the second electrode active material layer is formed to have a length smaller than the length of the first electrode active material layer so that a part of one longitudinal surface of the first electrode active material layer can be exposed to the outside.

Abstract: A horizontal bead mill for dispersing secondary battery materials and a method for dispersing conductive materials using the horizontal bead mill for dispersing the secondary battery materials are provided. The horizontal bead mill includes a vessel including an inlet and an outlet configured to receive disperse media. The vessel is filled with beads. A rotor is rotated in the vessel to rotate the beads to disperse the disperse media. A driving unit rotates the rotor. An inner surface of a sidewall of the vessel is inclined at a predetermined angle for an axis of the rotor in a manner that an inner diameter of the vessel gradually decreases from an inlet side to an outlet side.

Abstract: A die for coating an insulating liquid may include a die body configured to be positioned on a current collector with a certain space and discharge an insulating liquid; and a discharge portion configured to be formed on one surface where the insulating liquid of the die body is discharged, and form a discharge path and a discharge port where the insulating liquid is discharged, wherein the discharge portion includes a first discharge portion positioned at a front region side of a coating direction of the insulating liquid, and a second discharge portion positioned at a rear region side of the coating direction of the insulating liquid, an insulating liquid discharge path is formed between the first discharge portion and the second discharge portion, and an insulating liquid discharge port is formed between an end of the first discharge portion and an end of the second discharge portion.

Abstract: A negative electrode slurry including a lithium titanium oxide, a dispersant including a polar OH group and a non-polar alkyl group, a binder, and a solvent, and a method of preparing the same.

Abstract: A method of preparing a slurry composition for a secondary battery positive electrode includes preparing a positive electrode active material pre-dispersion by mixing a lithium iron phosphate-based positive electrode active material, a dispersant, and a solvent, and preparing a slurry for a positive electrode by further mixing a conductive agent, a binder, and an additional solvent with the positive electrode active material pre-dispersion is provided. A positive electrode for a secondary battery which is prepared by using the same method, and a lithium secondary battery including the positive electrode are also provided.

Abstract: A method of preparing graphene, including preparing graphite; and putting the graphite in the inside of a vessel and applying vibration at a frequency of 55 Hz to 65 Hz to the vessel.

Abstract: Disclosed is a coating apparatus for producing an electrode, which has a reduced defect rate in the coating process. The coating apparatus includes a die unit having an inlet through which the electrode slurry is introduced and an inner space for accommodating the introduced electrode slurry; a shim unit mounted in the die unit and configured to form an outlet together with the die unit so that the electrode slurry is discharged therethrough; and a cover member configured to surround an outer surface of the die unit and the shim unit so that the electrode slurry is not leaked at the outer surface, except for the outlet.

Abstract: Disclosed is a coating apparatus for producing an electrode, which has a reduced defect rate in the coating process. The coating apparatus includes a die unit having an inlet through which the electrode slurry is introduced and an inner space for accommodating the introduced electrode slurry; a shim unit mounted in the die unit and configured to form an outlet together with the die unit so that the electrode slurry is discharged therethrough; and a cover member configured to surround an outer surface of the die unit and the shim unit so that the electrode slurry is not leaked at the outer surface, except for the outlet.

Abstract: The present invention provides a method of preparing a slurry for a secondary battery positive electrode which includes forming a first mixture in a paste state by adding a lithium iron phosphate-based positive electrode active material, a conductive agent, a binder, and a solvent, and preparing a slurry for a positive electrode by mixing while further adding a solvent to the first mixture in the paste state.

Abstract: Provided is a method for manufacturing an all-solid-state battery which allows a solid electrolyte layer and an electrode to be in sufficiently close in contact with each other without deformation of the electrode shape or damages upon the electrode. The method for manufacturing an all-solid-state battery includes applying slurry for a solid electrolyte layer to the surface of an electrode active material layer to form a patterned solid electrolyte layer, and carrying out pressurization to form a solid electrolyte layer.

Abstract: Complex particles for a negative electrode active material according to the present disclosure have no problem with reduced capacity and output by virtue of sufficient electrochemical reaction sites between a solid electrolyte and an electrode active material. The complex particles according to the present disclosure include carbon particles of a carbon material such as flaky graphite, which are spherical in shape by shape modification, and a solid electrolyte and a conductive material filled between the particles, and thus have the increased contact area between the active material and the solid electrolyte increases, and ion conduction and electron conduction paths extended and maintained to the inside of the active material particles.

Abstract: The present invention relates to a positive electrode active material pre-dispersion composition which includes a lithium iron phosphate-based positive electrode active material, a dispersant, and a solvent, wherein the dispersant includes a hydrogenated nitrile butadiene rubber (HNBR), a slurry composition for a secondary battery positive electrode which is prepared by using the positive electrode active material pre-dispersion composition, a positive electrode for a secondary battery, and a lithium secondary battery including the positive electrode.

Abstract: A negative electrode slurry including a lithium titanium oxide, a dispersant including a polar OH group and a non-polar alkyl group, a binder, and a solvent, and a method of preparing the same.

Abstract: The present invention relates to a grinder using induced electric fields. The grinder comprises: a grinding unit on which a plurality of protrusions for cutting are disposed on an outer circumferential surface thereof; a power unit disposed in the grinding unit to generate electric fields and attach the conductive materials to the grinding unit; and a chamber disposed outside the grinding unit and comprising beads that disperse and grind the conductive materials attached to the grinding unit, wherein the conductive materials have directionality by the electric fields of the power unit.

Abstract: The present disclosure relates to a carbon black dispersion solution comprising carbon black, a dispersion medium, and partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to the following Mathematical Formula 1, wherein dispersed particle diameters of the carbon black have particle size distribution D50 of 0.1 ?m to 2 ?m, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.

Abstract: A method of preparing graphene, including preparing graphite; and putting the graphite in the inside of a vessel and applying vibration at a frequency of 55 Hz to 65 Hz to the vessel.