Abstract: There is provided a multi-slot die coater including a manifold for a uniform flow of an electrode active material slurry without stagnation. The multi-slot die coater of the present disclosure includes a first manifold in which a first coating solution is received and a second manifold in which a second coating solution is received. The first manifold is a chamber of an inwardly recessed shape, and includes a first surface and a second surface having different angles to a lower slot at a location close to the lower slot, and the angle of the first surface closest to the lower slot is formed at a level of 30˜70% of the second surface following the first surface.

Abstract: Provided is a slot die coater capable of uniformly forming a coating boundary formed in a machine direction (MD). The slot die coater includes at least two die blocks; a shim plate provided between the two die blocks to form a slot; and a manifold provided in the die block and configured to accommodate a coating solution, wherein the coating solution is discharged and applied to a substrate through a discharge port communicatively connected with the slot an end of the shim plate is moved backward relative to a die lip which is a front end of the die block so as to be offset relative to the die lip.

Abstract: Provided is a slot die coater with a uniform flow of coating solution without stagnation. The slot die coater includes at least two die blocks; a shim plate provided between the two die blocks to form a slot; and a manifold provided in the die block and communicatively connected with the slot as a chamber in the shape of indention accommodating a coating solution, wherein the coating solution is discharged and applied to a surface of a continuously traveling substrate through a discharge port communicatively connected with the slot, and a region of the die block from a front end of the manifold to a die lip which is a front end of the die block is a land, and a ratio A/B of a land length A to a manifold length B is in a range of 0.5 to 3.55.

Abstract: A dual slot die coater including a lower plate, an intermediate plate positioned on the lower plate and an upper plate positioned on the intermediate plate, a lower slot being formed between the lower plate and the intermediate plate, and an upper slot being formed between the intermediate plate and the upper plate. The lower plate, the intermediate plate and the upper plate have a lower die lip, an intermediate die lip and an upper die lip, each forming an front end with respect to the current collector, respectively, and a distance between the current collector and the lower die lip is larger than a distance between the current collector and the upper die lip and a distance between the current collector and the intermediate die lip.

Abstract: A system for drying an electrode includes a drying unit which dries an electrode which is moving on a transfer line; a thermal imaging camera which photographs a surface of the electrode in real time; a calculation unit which stores an image taken by the thermal imaging camera, and generates temperature distribution data in a width direction of the electrode from the image; and an output unit which outputs the image and the temperature distribution data in a width direction of the electrode.

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: The present invention provides: an electrode mixture manufacturing method comprising the processes of introducing a first binder, an electrode active material, and a conductive material into an extruder, performing a first mixing of the first binder, the electrode active material, and the conductive material in the extruder, additionally introducing a second binder into the extruder and performing a second mixing, and yielding an electrode mixture resulting from the first mixing and the second mixing; an electrode mixture manufactured thereby; and an electrode manufacturing method using the electrode mixture.

Abstract: A method of manufacturing a shim for a die coater is disclosed herein. In some embodiments, a method of manufacturing a shim for a die coater, where the shim is applied to an electrode slurry die of the die coater and used for discharging an electrode slurry from the die coater, comprising milling a surface of a metal plate to prepare the shim. Using the method herein, it is possible to manufacture a shim for a die coater having a low thickness deviation by processing the shim for a die coater through a milling process.

Abstract: An electrode slurry coating system and a method of using the same to coat a current collector layer are disclosed herein. In some embodiments, the electrode slurry coating system includes a supply tank, a supply line having a control valve and branching into at least three sub-supply lines at one end thereof, an electrode slurry slot die having a manifold, a coating roller, and a temperature sensor, wherein the temperature is sensor configured to measure the temperature of the electrode slurry discharged from the electrode slurry slot die, and wherein the control valve is configured to control the flow rate of the electrode slurry in response to a temperature of the electrode slurry measured by the temperature sensor.

Abstract: A secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, the positive electrode active material layer includes a positive electrode active material and carbon nanotubes, and the electrolyte solution includes a non-aqueous solvent, a lithium salt, and tetravinylsilane.

Abstract: A method and apparatus for coating an electrode is disclosed herein. In some embodiments, an apparatus for coating an electrode slurry includes a coating die configured to coat an electrode slurry on one surface of a current collector, a thickness measuring sensor spaced apart from the current collector by a predetermined interval and configured to measure a thickness of the coated electrode slurry in real time after coating by the coating die; and a controller which controls a coated amount of the electrode slurry in real time according to the measured thickness.

Abstract: The present invention relates to a carbon nanotube dispersion including carbon nanotubes, a polymer dispersant containing an amine, a phenolic compound including two or more aromatic rings, and an aqueous solvent, wherein the polymer dispersant and the phenolic compound including two or more aromatic rings are included in a weight ratio of 100:1 to 100:90, and having low viscosity and a small change of viscosity over time.

Abstract: Provided is a slot die coater including: at least two die blocks; a shim plate provided between the two die blocks to form a slot; and a manifold provided in the die block and configured to accommodate a coating solution, wherein the slot die coater is configured to discharge and apply the coating solution to a substrate. The shim plate includes an open portion such that a coating width of a coating layer applied on the substrate is determined, and a part of a corner of the shim plate defining the open portion from which the coating solution is discharged, is chamfered. When a thickness of the coating solution applied on the substrate is A, the chamfered part has a shape cut by a depth equal to or greater than A to inside of the corner in a region away inward by A from the end of the shim plate.

Abstract: A multi-slot die coater has improved a deviation in a width direction of a slot gap caused by a structural feature including a thin die block. The multi-slot die coater including a lower slot and an upper slot includes a lower die block; an intermediate die block disposed on the lower die block to form the lower slot therebetween; and an upper die block disposed on the intermediate die block to form the upper slot therebetween, wherein the intermediate die block comprises a manifold that accommodates a coating solution, and is communicatively connected to the upper slot, and wherein a shortest distance from distances from any points on a bottom surface of the manifold to any points on the second surface is equal to or greater than 10 mm.

Abstract: A multi-slot die coater has improved a deviation in a width direction of a slot gap caused by a structural feature including a thin die block. The multi-slot die coater including a lower slot and an upper slot includes a lower die block; an intermediate die block disposed on the lower die block to form the lower slot therebetween; and an upper die block disposed on the intermediate die block to form the upper slot therebetween, wherein an angle formed by a first surface of the intermediate die block facing the upper die block and a second surface of the intermediate die block facing the lower die block is equal to or greater than 20 degrees.

Abstract: A positive electrode includes a positive electrode active material layer including a positive electrode active material, a conductive material, and a binder, wherein the positive electrode active material contains any one among Li(Nix1Mny1Coz1)O2 (0.55<x1<0.69, 0.15<y1<0.29, 0.15<z1<0.29, x1+y1+z1=1) and Li(Nix2Mny2Coz2)O2 (0.75<x2<0.89, 0.05<y2<0.19, 0.05<z2<0.19, x2+y2+z2=1) and the conductive material contains a carbon nanotube, and when the positive electrode active material is Li(Nix2Mny2Coz2)O2, the positive electrode active material layer satisfies Relation 1 and when the positive electrode active material is Li(Nix2Mny2Coz2)O2, the positive electrode active material layer satisfies Relation 2: 0.0020×a<b<0.0050×a??[Relation 1] 0.0015×a<b<0.

Abstract: A pressing jig of a battery cell including a pressing pad, in which the modulus of the central region is different from the modulus of the peripheral region, and a method of degassing a battery cell using the same are provided. The pressing pad can easily discharge gas in the battery cell during the formation process of a battery cell by allowing higher pressure to be applied to the central region than the peripheral region.

Abstract: An electrode rolling apparatus a for rolling an electrode substrate having a coated portion and an uncoated portion includes a coil section having an effective region where a uniform magnetic field is generated; and an electrode rolling section for rolling the electrode substrate, wherein the coated portion and the uncoated portion each comprise a plurality of pattern portions, the uncoated portion comprising a first uncoated pattern portion located on at least one end of opposing ends of the electrode substrate and a second uncoated pattern portion located between coated pattern portions, wherein the coil section comprises a first coil section for heating the first uncoated pattern portion, and a second coil section for heating the second uncoated pattern portion, and wherein a heating temperature of the second coil section is lower than a heating temperature of the first coil section.

Abstract: The present invention provides: an electrode mixture manufacturing method comprising the processes of introducing a first binder, an electrode active material, and a conductive material into an extruder, performing a first mixing of the first binder, the electrode active material, and the conductive material in the extruder, additionally introducing a second binder into the extruder and performing a second mixing, and yielding an electrode mixture resulting from the first mixing and the second mixing; an electrode mixture manufactured thereby; and an electrode manufacturing method using the electrode mixture.

Abstract: The present invention relates to a carbon nanotube dispersion including carbon nanotubes, a polymer dispersant containing an amine, a phenolic compound including two or more aromatic rings, and an aqueous solvent, wherein the polymer dispersant and the phenolic compound including two or more aromatic rings are included in a weight ratio of 100:1 to 100:90, and having low viscosity and a small change of viscosity over time.