Abstract: The present invention relates to a method of preparing a positive electrode which includes forming a solid electrolyte by mixing a lithium salt and a polymer for a solid electrolyte in a dry atmosphere, forming a dry mixture by stirring after adding a conductive agent and a positive electrode active material to the solid electrolyte in a dry atmosphere, and pressing after coating a current collector with the dry mixture.

Abstract: The present technology relates to a manufacturing method for an electrode binder, comprising a step of dissolving pelletized polyvinylidene fluoride (PVDF) in a solvent; and an electrode assembly comprising the electrode binder. The present invention may provide an electrode assembly which has a low content of impurities in a binder solution, is capable of increasing dispersibility of an electrode active material, and exhibits excellent binding force.

Abstract: Disclosed is a slot die coater adjusting device, which adjusts a slot die coater including a lower die having a lower discharge hole for discharging a first active material slurry and an upper die having an upper discharge hole for discharging a second active material slurry, to adjust a distance between the lower discharge hole and the upper discharge hole by allowing the upper die to move. The slot die coater adjusting device includes pressing block assemblies respectively provided to both longitudinal sides of the slot die coater and fixed to the upper die; a linear motion (LM) guide disposed at a lower portion of the pressing block assembly and connected to the pressing block assembly to guide a movement of the pressing block assembly; a servo motor configured to give a power for moving the LM guide; and a reducer connected between the servo motor and the LM guide.

Abstract: A positive electrode includes a current collector, a first positive electrode active material layer, and a second positive electrode active material layer. The first positive electrode active material layer is formed on the current collector and the second positive electrode active material layer is formed on the first positive electrode active material layer. The first and second positive electrode active material layers each include lithium iron phosphate, a fluorine-based binder, a rubber-based binder, and a conductive material. The rubber-based binder includes a first hydrogenated nitrile butadiene rubber and a second hydrogenated nitrile butadiene rubber A ratio (P2/P1) of the weight P2 of fluorine contained in the second positive electrode active material layer to the weight P1 of fluorine contained in the first positive electrode active material layer is 1 or less.

Abstract: The present invention relates to a method of preparing a positive electrode which includes forming a solid electrolyte by mixing a lithium salt and a polymer for a solid electrolyte in a dry atmosphere, forming a dry mixture by stirring after adding a conductive agent and a positive electrode active material to the solid electrolyte in a dry atmosphere, and pressing after coating a current collector with the dry mixture.

Abstract: There is provided a multi-slot die coater in which a step is formed between rear surfaces of die blocks through a fixing block having a step portion. The fixing block has the step portion of a preset height, and any one die block is coupled to the step portion and the other die block is coupled to the other portion than the step portion, and thus the step is naturally formed between the rear surfaces of the die blocks by the coupling of the die blocks to the fixing block. Thus, it is possible to always maintain the distance of the front ends of the die blocks and the substrate, since the fixing block is fixed between the die blocks, once it is set, the coating gap does not change and is maintained during the process, thereby suppressing the widthwise coating gap deviation.

Abstract: The present disclosure relates to a multilayer negative electrode comprising a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material, a first negative electrode mixture layer formed on one surface or both surfaces of the current collector and containing natural graphite as a negative electrode active material and a second negative electrode mixture layer formed on the first negative electrode mixture layer and containing artificial graphite as a negative electrode active material, and a lithium secondary battery including the same.

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: A slurry supply device includes a slurry tank for storing slurry; a temperature controller for supplying hot or cold water to the slurry tank to control the temperature of the slurry; and a double pipe for supplying the slurry to the slurry tank while being connected to the slurry tank and for allowing hot or cold water to move to control the temperature of the slurry.

Abstract: There is provided a multi-slot die coater in which a step is formed between rear surfaces of die blocks through a fixing block having a step portion. The fixing block has the step portion of a preset height, and any one die block is coupled to the step portion and the other die block is coupled to the other portion than the step portion, and thus the step is naturally formed between the rear surfaces of the die blocks by the coupling of the die blocks to the fixing block. Thus, it is possible to always maintain the distance of the front ends of the die blocks and the substrate, since the fixing block is fixed between the die blocks, once it is set, the coating gap does not change and is maintained during the process, thereby suppressing the widthwise coating gap deviation.

Abstract: An electrode manufacturing apparatus includes a support roll supporting an electrode sheet, at least one pressure roll, a level sensor, and a control unit. The electrode sheet includes a coated portion and an uncoated portion, and the support roll transports the electrode sheet in a first direction. The pressure roll contacts the support roll with the electrode sheet disposed therebetween and pressurizes the uncoated portion of the electrode sheet. The level sensor detects a level of the uncoated portion, and the control unit controls the pressure roll in response to the level detected by the level sensor. The at least one pressure roll is movable in a second direction crossing the first direction.

Abstract: A multi-slot die coater includes a first slot and a second slot to extrude and coat a coating solution on a surface of a continuously moving substrate through at least one of the first slot or the second slot, and includes a first outer die block; an intermediate die block positioned on the first outer die block such that the first slot is formed between the intermediate die block and the first outer die block; and a second outer die block positioned on the intermediate die block such that the second slot is formed between the second outer die block and the intermediate die block, wherein the die-coater includes contact surfaces between the first outer die block, the intermediate die block and the second die block that are inclined relative to a first plane and a fastener is fastened substantially perpendicular to one of the inclined contact surfaces.

Abstract: The present disclosure relates to a slot die coating apparatus for coating an electrode active material slurry onto an electrode collector, the slot die coating apparatus including: a coating roller; at least two or more dies; a discharge opening through which the electrode active material slurry is discharged in an opposite direction on which gravity acts; and an air vent installed in the die.

Abstract: The present disclosure relates to a multilayer negative electrode comprising a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material, a first negative electrode mixture layer formed on one surface or both surfaces of the current collector and containing natural graphite as a negative electrode active material and a second negative electrode mixture layer formed on the first negative electrode mixture layer and containing artificial graphite as a negative electrode active material, and a lithium secondary battery including the same.

Abstract: There is provided a multi-slot die coater that is easy to adjust a coating gap and can achieve widthwise deviation control of the coating gap. According to the present disclosure, a step is formed between rear surfaces of die blocks through a fixing block including a step adjustment block. The step adjustment block has a preset thickness, and the step adjustment block is mounted between any one die block and a flat plate-shaped block, and the other die block is coupled to the flat plate-shaped block, and thus the step is naturally formed between the rear surfaces of the die blocks by the coupling of the die blocks to the fixing block including the step adjustment block.

Abstract: An electrode slurry control device may include a main body configured to receive electrode slurry from an outside storage, a coater configured to discharge electrode slurry, a supply tube configured to supply the electrode slurry to the coater and connected to the main body through a first connection tube having a first opening/closing member, a first circulation tube connected to the main body through a second connection tube having a second opening/closing member; and a second circulation tube connected to the main body through a third connection tube having a third opening/closing member, a diameter of an inner peripheral surface of the second connection tube is smaller than an average diameter of an inner peripheral surface of the first circulation tube, and a diameter of an inner peripheral surface of the third connection tube is larger than an average diameter of an inner peripheral surface of the second connection tube.

Abstract: A slot die coater that includes a lower die block having a manifold, an upper die block, and a shim plate interposed between the lower die block and the upper die block to form a slot. The manifold configured to accommodate a coating solution, wherein the coating solution is delivered and coated on a substrate through an exit port in communication with the slot. The shim plate includes a plate-shaped member having an open portion which is cut in at least an area to determine a coating width of a coating layer coated on the substrate, and a structure protruding from the plate-shaped member and inserted into the manifold.

Abstract: The present disclosure relates to a slot die coating apparatus for coating an electrode collector with an electrode active material slurry. The slot die coating apparatus includes a coating roller; a slot die comprising a slurry receiving part and a discharge opening configured to discharge the electrode active material slurry in an opposite direction on which gravity acts; an air vent installed in the slot die so that it is directly connected to a point at which the slurry receiving part and the discharge opening connect.

Abstract: Provided is an electrode for a lithium secondary battery having excellent resistance and output characteristics while achieving high capacity characteristics due to a high active material content.

Abstract: An electrode for an electrochemical device includes an electrode active material layer having a multilayer structure including a lower sublayer and an upper sublayer having a stair-like structure defined between them along a peripheral region of the electrode active material layer, due to the areal difference of each layer, thereby facilitating control of the capacity ratio of the positive electrode to the negative electrode. A process for manufacturing the electrode includes formation of the stair-like structure, which provides higher processing efficiency as compared to the process of accurately matching the ends of the electrodes. Therefore, when controlling the electrode manufacturing process to realize a multilayer electrode having an adequate stair width that is not excessively out of range, it is possible to enhance the processing efficiency and to control the capacity ratio of the resultant electrode.