Lg Energy Solution, Ltd.

Lg Chem, Ltd

Electronics and Telecommunications Research Institute

Taek Soo Lee

Sang Hoon Choy

Cheol Woo Kim

Ki Tae Kim

Young Gon Kim

Shin Wook Jeon

Jong Su Yoon

Jin Ho Cho

Cheolwoo Kim

Young Joon Jo

Jung Min Yang

Do Hyun Lee

Je Young Kim

Song Taek Oh

Chang Wan Koo

Ji Hee Yoon

Il Jae Moon

Junsoo Park

Sang Hoon Choi

Sang Kyun Lee

Jung Woo Yoo

Ji Yeon Kim

Jun Soo Park

Jin Young Son

Su Hyun Kim

Cheol-Woo Kim

Joon Sun Park

Sang Yi Yi

Jihee Yoon

Moo Yong Shin

Guk Tae Kim

Taek Jun Nam

Chan Soo Jun

Man Hyeong Kim

Min Hyuck Choi

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.I) of the carbon-based negative electrode active material after activation in a predetermined range that is lower than the alignment (O.I) 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.

Negative electrode for lithium secondary battery, and method for manufacturing same

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.

Negative electrode for lithium secondary battery and lithium secondary battery comprising same

The present invention relates to electrode slurry coating apparatus and method, the present invention ultimately allowing the process efficiency to be increased and rate of errors to be reduced when double-layer structured active material layers are formed by temporally adjusting the height of first and second discharge outlets through which active material is discharged.

Electrode slurry coating apparatus and method for forming double active material layers

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.

Negative electrode for lithium secondary battery and method for manufacturing same

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.

Magnetic alignment device for anode, and anode manufacturing method using same

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.

Negative electrode for lithium secondary battery, and magnetic alignment device for negative electrode for same

A magnetic alignment device for negative electrode and method for manufacturing negative electrode using the same. The magnetic alignment device can measure the loading amount of the negative electrode slurry applied on the negative 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 negative electrode slurry loading amount, 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.

Magnetism alignment apparatus for negative electrodes and method for manufacturing negative electrode using same

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.

Slot die coating device having air vent

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.

Multi-layer negative electrode comprising natural graphite and artificial graphite and lithium secondary battery comprising the same

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.

Electrode for lithium secondary battery

The present invention relates to an electrode slurry coating device and method, wherein the heights of first and second slot die heads for discharging active material can be controlled according to time to improve process efficiency and reduce defect rates when forming an active material layer having a double layer structure.

Secondary battery electrode plate including electrode mixture regions having different binder content, and method for manufacturing secondary battery electrode using same

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, a die comprising a lower discharge opening, through which a first electrode active material slurry is discharged, and an upper die located on the upper side of the lower die and having an upper discharge opening, through which a second electrode active material slurry is discharged, and an upper air vent may be installed in the upper die and a lower air vent may be installed in the lower die.

An electrode for a rechargeable battery in which a current collector is coated with an electrode mixture including an electrode active material and a binder includes a first electrode composite layer including PVdF as a first binder and an electrode active material and applied on a current collector; and a second electrode composite layer including a second binder and an electrode active material and applied on the first electrode composite layer, wherein crystallinity of the first binder is 58 or greater.

Multi-layered electrode for rechargeable battery including binder having high crystallinity

The present invention relates to a double slit coating die, and an electrode active material coating apparatus comprising same, the double slit coating die comprising first to fourth blocks which are positioned sequentially adjacent to each other, and having a structure in which the positions of the first and second blocks can move in a direction tilted at an angle &#x3b8; with respect to the interface between the second and third blocks. The present invention has the effects of preventing slip surfaces between blocks constituting the die from spreading apart, and reducing offset in a coating process.

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Daejeon, South Korea

Taek Soo Lee