Lg Chem, Ltd

Lg Energy Solution, Ltd.

Jin Young Son

Sang Hoon Choy

Hyun Won Lee

Cheol Woo Kim

Byoung Hoon Ahn

Ye Lin Kim

Do Hwa Jung

Taek Soo Lee

Shin Wook Jeon

Young Kuk Ko

Hyung Suk Cho

Hyun Sik Chae

Jung Min Yang

Do Hyun Lee

Moo Yong Shin

Chan Soo Jun

Eun Hoe Jeong

The present invention relates to an electrode assembly for a secondary battery. The electrode assembly for the secondary battery comprises a radical unit comprising first and second electrode sheets each of which is folded so that both ends thereof overlap each other; and a first separator folded several times and having an upper folded portion into which the first electrode sheet is coupled to be fitted and a lower folded portion into which the second electrode sheet is coupled to be fitted, wherein, in the radical unit, the folded portions of the first and second electrode sheets are cut to form two first electrodes and two second electrodes, which are completely separated from each other, and the first electrode, the first separator, the second electrode, the first separator, the first electrode, the first separator, and the second electrode successively stacked.

Electrode assembly for secondary battery and method for manufacturing the same

The present invention relates to an apparatus and method for monitoring a dry state of an electrode substrate in which electrode slurry is applied to a collector. The monitoring method comprises emitting light onto a surface of the electrode substrate; receiving the light reflected by the surface of the electrode substrate; and analyzing a luminous intensity or spectrum of the received light to estimate a drying rate of the electrode substrate. The apparatus includes a light emitting part emitting light from a light source onto a surface of the electrode substrate; a light receiving part receiving the light reflected by the surface of the electrode substrate; and a computing device analyzing a luminous intensity or spectrum of the received light and comparing analyzed characteristics of the light with the reference data of the reflected light to the drying rate of the electrode substrate.

Method for monitoring dry state of electrode substrate

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.

Method of preparing graphene

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.

Grinder using induced electric field

Disclosed are an apparatus and method for preparing slurry for a secondary battery. According to the present invention, a solvent is intermittently injected into a mixer for preparing the slurry to measure a torque value applied to the mixer and thereby to obtain a maximum value of the torque value applied to the mixer. Then, a kneading point that is a mixing ratio of the powder and the solvent, which are used for preparing the slurry, is calculated to determine an optimized kneading point without error and through an automatic process.

Apparatus and method for preparing slurry for secondary battery

Provided is a dual coating method for an electrode, which coats the electrode of a battery. The dual coating method for an electrode includes transferring the electrode, coating the transferred electrode with a first coating solution, and coating the primarily-coated electrode with a second coating solution different from the first coating solution.

Dual coating method for electrode

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Daejeon, South Korea

Jin Young Son