Abstract: A negative electrode for a lithium secondary battery includes a negative electrode active layer divided into a center region, an edge region, and a sliding region on a negative electrode current collector. The lithium precipitation at the end of the negative electrode active layer can be suppressed by the alignment (O.I) of each carbon-based negative electrode active material contained in the center region, the edge region, and the sliding region satisfying Equation 1 and Equation 2. A secondary battery including the same has the advantage of excellent rapid charging performance. A method of manufacturing the negative electrode is also provided.

Abstract: A magnetic alignment device includes a first magnet part and a second magnet part, a thickness measuring part, and a control part. The first and second magnet parts accommodate an electrode sheet therebetween and the thickness measuring part measures a thickness of a negative electrode slurry disposed on the electrode sheet. The control part adjusts the separation distance of the first and second magnet parts. The magnetic alignment device measures the thickness of the negative electrode slurry applied on the negative electrode current collector in real time and controls the intensity of the magnetic field by adjusting the separation distance of the magnet part according to the measured negative electrode slurry thickness, and has an advantage of uniformly high alignment degree of the crystal faces of the carbon-based negative electrode active material contained in prepared negative electrode active layer.

Abstract: A manufacturing method of a negative electrode, in which a negative electrode slurry having a magnetic field applied is dried and then rolled, but by controlling the rolling load according to Formula 1, which depends on the intensity of the magnetic field applied to the negative electrode slurry. The manufactured negative electrode exhibits high energy density while maintaining the objective thickness and low rolling stress and good structural stability. The manufactured negative electrode exhibits reduces low volume change of the negative electrode active layer when charging and discharging.

Abstract: A negative electrode for lithium secondary battery includes a negative electrode current collector, a first negative electrode active layer, and a second negative electrode active layer. The first negative electrode active layer is provided on at least one side of the negative electrode current collector and has a first carbon-based negative electrode active material. The second negative electrode active layer is provided on the first negative electrode active layer and includes a second carbon-based negative electrode active material and a silicon-based negative electrode active material. The second negative electrode active layer has an alignment (O.I) of the carbon-based negative electrode active material according to Equation 1 of 2.5 or less and satisfies Equation 2 being 8 or less. A manufacturing method including the same is also provided.

Abstract: A negative electrode manufacturing device for lithium secondary battery that is capable of simultaneously performing crystal surface orientation and pre-drying of a carbon-based negative electrode active material at an edge end of a negative electrode slurry is provided. The negative electrode manufacturing device provides a drying part using light at an edge of a magnetic part that aligns the crystal surface of the carbon-based negative electrode active material. A negative electrode manufactured by the device has a high orientation of the crystal surface of the carbon-based negative electrode active material contained in a sliding region of the negative electrode active layer, and high uniformity of orientation between the sliding region and a flat region of the negative electrode active material.

Abstract: A negative electrode manufacturing device for a secondary battery includes a dual slot die having an upper block, a middle block, and a lower block, a first slot provided through a gap between the upper and middle blocks and a second slot provided through a gap between the middle and lower blocks. The first and second slots discharge a first negative electrode slurry. The device further includes a coating roll opposite the first and second slots that transfers an electrode sheet coated with the negative electrode slurry discharged from each slot. The upper block, the middle block, and the lower block include an upper lip, a middle lip, and a lower lip forming an outlet at a front end of each block. The upper and lower lips exhibit a magnetism of a same polarity, and the middle and upper lips exhibit a magnetism having an opposite polarity.

Abstract: A negative electrode for a lithium secondary battery includes a carbon-based negative electrode active material and a silicon-based negative electrode active material together as a negative electrode active material. The negative electrode exhibits excellent characteristics of charge and discharge capacity and energy density. Furthermore, the negative electrode has the advantage of exhibiting high charge characteristics and life characteristics during long-term charge and discharge by realizing the alignment (O.Ia) of the carbon-based negative electrode active material after activation in a predetermined range that is lower than the alignment (O.Ir) of the carbon-based negative electrode active material before activation. A lithium secondary battery including the negative electrode is also provided. Further, methods of manufacturing the negative electrode and the lithium secondary battery are also provided.

Abstract: A negative electrode manufacturing device for a secondary battery includes a dual slot die and a coating roll. The dual slot die includes an upper block, a middle block, a lower block, a first slot and a second slot. The first slot is a gap between the upper block and the middle block for discharging negative electrode slurry, and the second slot is a gap between the middle block and the lower block for discharging negative electrode slurry. The upper block, the middle block, and the lower block comprise an upper lip, a middle lip, and a lower lip located at each front end with magnetism of the same polarity. The coating roll exhibits a magnetism of a polarity opposite to the polarity of the magnetism of each lip. A method of manufacturing using the same is also provided.

Abstract: A negative electrode manufacturing device for a secondary battery includes a dual slot die and a coating roll. The dual slot die includes an upper block, a middle block, a lower block, a first slot, and a second slot. The first slot is a gap between the upper block and the middle block for discharging a first negative electrode slurry, and the second slot provided is a gap between the middle block and the lower block for discharging a second negative electrode slurry. The coating roll is disposed opposite the first and second slots and transfers the electrode sheet. The upper block, the middle block, and the lower block comprise an upper lip, a middle lip, and a lower lip forming an outlet at each front end and exhibit magnetism of the same polarity. A method of manufacturing using the same is also provided.

Abstract: A negative electrode manufacturing device for a secondary battery includes a slot die including an upper block, a lower block, and a slot provided through a gap between the upper block and the lower block configured to discharge the negative electrode slurry. The upper and lower blocks include an upper lip and a lower lip forming an outlet at respective front ends of the blocks. The upper and lower lips exhibit magnetism of the same polarity. The carbon-based negative electrode active material in the discharged negative electrode slurry may be applied with the crystal faces oriented at a predetermined angle with respect to the surface of the current collector. Therefore, the manufactured negative electrode has an excellent degree of orientation of the carbon-based negative electrode active material and is being applied to a mass production process. Also provided is a method of manufacturing a negative electrode using the same.

Abstract: A negative electrode for a lithium secondary battery in which lithium precipitation is suppressed. The negative electrode has a form in which a high degree of alignment of a carbon-based active material contained in a sliding portion of the negative electrode active layer is realized. Accordingly, the negative electrode has an excellent effect of suppressing lithium precipitation at the end of the negative electrode active layer during charging and discharging of the secondary battery, so that a lithium secondary battery including the negative electrode has high safety and can be charged and discharged for a long time under high rate conditions. A lithium secondary battery including the negative electrode is also provided.

Abstract: A negative electrode for a lithium secondary battery includes a negative electrode active layer and a negative electrode current collector. The negative electrode active layer includes a center region, an edge region, and a sliding region on the current collector, and has the advantage of exhibiting a high-rate charge and discharge and a high energy density with a small volume change during charge and discharge by having an alignment degree (O.I.) of each carbon-based negative electrode active material contained in the center region, the edge region, and the sliding region satisfying Formula 1 and Formula 2. A method of manufacturing the same is also provided.

Abstract: A magnetic alignment device for an electrode and method for manufacturing an electrode using the same. The magnetic alignment device can measure the loading amount of the electrode slurry applied on the electrode collector in real time and can easily control the intensity of the magnetic field by adjusting the separation distance of the magnet portion according to the measured electrode slurry loading amount, and has an advantage of uniformly high alignment degree of the crystal faces of the carbon-based electrode active material contained in prepared electrode active layer.

Abstract: A magnetic alignment device applies a magnetic field to a negative electrode slurry by introducing a magnet part to an upper and a lower portion of a negative electrode current collector to which the negative electrode slurry is applied, respectively, wherein a first region located upstream along a transfer direction of the negative electrode current collector is capable of applying a stronger magnetic force than a second region located downstream in the magnet part. Accordingly, in manufacturing the negative electrode, the alignment of the carbon-based negative electrode active material contained in the negative electrode slurry and the arithmetic mean height of the surface of the negative electrode active layer can be easily controlled to a certain range. Furthermore, the negative electrode prepared according to the method has the advantage of having excellent electrical properties and surface properties of the negative electrode active layer.

Abstract: A magnetic alignment device applies a magnetic field to a negative electrode slurry by introducing a magnet part to an upper and a lower portion of a negative electrode current collector on which the negative electrode slurry is applied, respectively. By applying a stronger magnetic field in a second region of the magnet part located downstream along the transfer direction of the negative electrode current collector than in a first region of the magnet part located upstream, and by arranging a drying part adjacent to the end of the second region where the stronger magnetic field is applied, a negative electrode having a significantly higher alignment of the carbon-based negative electrode active material contained in the negative electrode slurry can be manufactured. A method for manufacturing a negative electrode using the magnetic alignment device is also provided.

Abstract: A negative electrode for a lithium secondary battery includes a negative electrode active layer and a negative electrode current collector. The negative electrode active layer includes a center region, an edge region, and a sliding region on the current collector, and has the advantage of exhibiting a high-rate charge and discharge and a high energy density with a small volume change during charge and discharge by having an alignment degree (O.I.) of each carbon-based negative electrode active material contained in the center region, the edge region, and the sliding region satisfying Formula 1 and Formula 2. A method of manufacturing the same is also provided.

Abstract: A negative electrode for a lithium secondary battery includes a negative electrode active layer divided into a center region, an edge region, and a sliding region on a negative electrode current collector. The lithium precipitation at the end of the negative electrode active layer can be suppressed by the alignment (O.I) of each carbon-based negative electrode active material contained in the center region, the edge region, and the sliding region satisfying Equation 1 and Equation 2. A secondary battery including the same has the advantage of excellent rapid charging performance. A method of manufacturing the negative electrode is also provided.

Abstract: Disclosed herein relates to a negative electrode for lithium secondary battery and a method for manufacturing the same. The negative electrode has a structure in which a first negative electrode active layer and a second negative electrode active layer are sequentially stacked on a negative electrode current collector. By controlling alignment (O.I) of the carbon-based active material to be lower in the second negative electrode active layer than in the first negative electrode active layer, and by preparing a low percentage of pores in the second negative electrode active layer, it is possible to have a flow path for the electrolyte to move inside the negative electrode active layer even after the rolling process of the negative electrode active layer. The negative electrode also has a high wetting ability to the electrolyte and high energy density.

Abstract: A magnetic alignment device includes a first magnet part and a second magnet part, a thickness measuring part, and a control part. The first and second magnet parts accommodate an electrode sheet therebetween and the thickness measuring part measures a thickness of a negative electrode slurry disposed on the electrode sheet. The control part adjusts the separation distance of the first and second magnet parts. The magnetic alignment device measures the thickness of the negative electrode slurry applied on the negative electrode current collector in real time and controls the intensity of the magnetic field by adjusting the separation distance of the magnet part according to the measured negative electrode slurry thickness, and has an advantage of uniformly high alignment degree of the crystal faces of the carbon-based negative electrode active material contained in prepared negative electrode active layer.

Abstract: A negative electrode for a lithium secondary battery includes a carbon-based negative electrode active material and a silicon-based negative electrode active material together as a negative electrode active material. The negative electrode exhibits excellent characteristics of charge and discharge capacity and energy density. Furthermore, the negative electrode has the advantage of exhibiting high charge characteristics and life characteristics during long-term charge and discharge by realizing the alignment (O.Ia) of the carbon-based negative electrode active material after activation in a predetermined range that is lower than the alignment (O.Ir) of the carbon-based negative electrode active material before activation. A lithium secondary battery including the negative electrode is also provided. Further, methods of manufacturing the negative electrode and the lithium secondary battery are also provided.