Lg Chem, Ltd

Hyeong Jin Kim

Ho Chun Lee

Sung Kyun Chang

Jihoon Cho

Duk Hyun Ryu

Seung Tae Hong

Ki Hong Min

Byeong Geun Kim

Changmin Han

Sang Hyuck Park

Eun Young Goh

Jae Hoon You

Jun Yong Jeong

Hyung Keun Lee

Jin Hee Yeon

Sung Min Hwang

Jeong Ju Cho

Ki Hun Song

Han Sung Lee

Sung-Min Hwang

Sang Hoon Choy

Yu Sin Kim

Su Taek Jung

Jeong Sam Son

Hyun-sook Baik

Taeyoon Jung

Byung Taek Yang

Hye Yun Cha

Sung Hyun Kim

Jae Hyun Lee

Soon Ho Ahn

Sungjin Kwon

Kiwoong Kim

Han Ho Lee

Seung-Don Choi

Mi Young Son

Hyun-Chul Jung

Sunghyun Kim

Dongmyung Kim

Seok Joo Jung

Kihong Min

Hansung Lee

Kihun Song

Disclosed is a device for notching, at an interval of a unit electrode, a continuous electrode sheet in which an electrode active material is applied to one or both surfaces thereof, to form a plurality of unit electrodes from the electrode sheet, the device including a press to press notches on the top and the bottom of the electrode sheet at a set position, and two or more grippers arranged at the rear of the press based on a feed direction of the electrode sheet, the grippers drawing and transporting the electrode sheet by one pitch, a size corresponding to the unit electrode according to operation of the press, wherein while one of the grippers draws and transports the electrode sheet, the remaining grippers move to a position for drawing.

Device for notching a secondary battery manufactured using the same

Disclosed herein is a folding device to manufacture a stacked/folded type electrode assembly having unit cells sequentially stacked in a state in which a separation film is disposed between the respective unit cells, the folding device including a web supply unit to supply a web having plate-shaped unit cells arranged at the top of a separation film at predetermined intervals, a winding jig to rotate the unit cells while holding a first one of the unit cells of the web so that the unit cells are sequentially stacked in a state in which the separation film is disposed between the respective unit cells, and a Y-axis directional rotary shaft compensation unit to compensate for a position of a rotary shaft of the winding jig in a direction (Y-axis direction) perpendicular to an advancing direction of the web, wherein the Y-axis directional rotary shaft compensation unit periodically changes the position of the rotary shaft in the direction (Y axis) perpendicular to the advancing direction (X axis) of the web to minimize vertical amplitude of the web during winding.

Device for folding electrode assembly

Disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.

Cathode active material for lithium secondary battery

Disclosed is a device for notching, at an interval of a unit electrode, a continuous electrode sheet in which an electrode active material is applied to one or both surfaces thereof, to form a plurality of unit electrodes from the electrode sheet, the device including a press to press notches on the top and the bottom of the electrode sheet at a set position, and a drawing member arranged at the rear of the press based on a feed direction of the electrode sheet, the drawing member drawing and transporting the electrode sheet by one pitch, a size corresponding to the unit electrode according to operation of the press, wherein, when one of the grippers draws and transports the electrode sheet, the remaining grippers move to a position for drawing.

Device for notching and secondary battery manufactured using the same

Disclosed herein is an electrode assembly of a cathode/separator/anode structure, wherein a plurality of first unit electrodes and a second electrode sheet are wound so that the first unit electrodes are opposite to the second electrode sheet via a separator sheet, and a first electrode and a second electrode have opposite polarities.

Electrode assembly of novel structure and process for preparation of the same

Disclosed is a method for manufacturing a battery cell including an electrode assembly and electrolyte provided in a battery case composed of a laminate sheet having a resin layer and a metal layer, which includes; (a) thermally fusing and sealing the periphery of the case except for an end part thereof while the electrode assembly is mounted in the case; (b) introducing the electrolyte through the unsealed end part then sealing the same by thermal fusion; (c) charging and discharging the battery cell to activate the same; (d) puncturing the unsealed part inside the end part to form a through-hole communicating with the inside of the case; and (e) pulling top and bottom faces of the battery case in the opposite direction to each other at the unsealed part to open the same while applying vacuum pressure, to thereby remove the gas generated during activation as well as excess electrolyte.

Method for manufacturing battery cell and battery cell manufactured using the same

Disclosed is an electrolyte comprising: (a) an electrolyte salt; (b) a non-aqueous electrolyte solvent; and (c) a binary or multinary metal oxide salt. An electrochemical device comprising the same electrolyte is also disclosed. The metal oxide salt used in the electrolyte is dissolved in a non-aqueous solvent and generates oxyanions capable of improving corrosion resistance of metals. Therefore, the electrolyte prevents corrosion of metallic materials present in an electrochemical device, caused by extreme conditions, such as overcharge, overdischarge and high-temperature storage conditions, to which the device is exposed. Further, the electrolyte prevents degradation in the quality of an electrochemical device, caused by corrosion of metallic materials.

Nonaqueous electrolyte comprising oxyanion and lithium secondary battery using the same

The present invention relates to a nonaqueous electrolyte solution containing new additives and a lithium secondary battery including the same. More particularly, the invention relates to a nonaqueous electrolyte solution containing a lithium salt, an electrolyte compound, a first additive compound with an oxidation initiation potential of more than 4.2 V, and a second additive compound with an oxidation initiation potential of more than 4.2 V, which is higher in oxidation initiation potential than the first additive, and deposits oxidative products or form a polymer film, in oxidation, as well as a lithium secondary battery including the same. The present invention can provide a lithium secondary battery excellent in both the battery performance and the battery safety in overcharge by the combined use of the first additive and the second battery as additives to the nonaqueous electrolyte solution.

Non-aqueous electrolyte and lithium secondary battery using the same

Disclosed is a compound represented by the following formula 1:  wherein, each of R&#x2dc;Rindependently represents &#x2014;H, &#x2014;F, &#x2014;Cl, &#x2014;Br, &#x2014;I, &#x2014;OH, &#x2014;SH, &#x2014;COOH, &#x2014;POH, &#x2014;NH, &#x2014;NO, &#x2014;O(CHCHO)H (wherein, n is an integer of 1&#x2dc;5), C&#x2dc;Calkyl group, C&#x2dc;Caminoalkyl group, C&#x2dc;Chydroxyalkyl group, C&#x2dc;Chaloalkyl group, C&#x2dc;Calkenyl group, C&#x2dc;Calkoxy group, C&#x2dc;Calkylamino group, C&#x2dc;Cdialkylamino group, C&#x2dc;Caryl group, C&#x2dc;Caminoaryl group, C&#x2dc;Chydroxyaryl group, C&#x2dc;Chaloaryl group, C&#x2dc;Cbenzyl group, C&#x2dc;Caminobenzyl group, C&#x2dc;Chydroxybenzyl group, C&#x2dc;Chalobenzyl group, or nitrile group (&#x2014;CN); and at least one of R&#x2dc;Ris nitrile group (&#x2014;CN). A non-aqueous electrolyte comprising: (i) a lithium salt, (ii) a solvent, and (iii) a compound represented by formula 1; and a secondary battery comprising the non-aqueous electrolyte are also disclosed. When the compound represented by formula 1 is added to a non-aqueous electrolyte, it is possible to improve the safety of a secondary battery in an overcharged state.

Additive for non-aqueous electrolyte and secondary battery using the same

Disclosed are a cathode for a battery and a lithium ion battery. The cathode for a battery comprises a metal hydroxide having a large specific surface area as a cathode additive. The lithium ion battery comprises a cathode, an anode and a non-aqueous electrolyte, wherein the cathode comprises a metal hydroxide having a large specific surface area as a cathode additive. When a metal hydroxide having a large specific surface area is used as a cathode additive, excellent storage properties of a battery at a high temperature can be obtained, even if the metal hydroxide is used in a small amount.

Lithium ion battery having an improved conserved property at a high temperature

Disclosed is an anode active material, comprising: (a) a carbonaceous material; and (b) a carbide coating layer partially or totally formed on a surface of the carbonaceous material, the carbide coating layer comprising at least one element selected from the group consisting of metals and metalloids. An anode obtained by using the anode active material and an electrochemical device comprising the anode are also disclosed. The carbonaceous material comprises a coating layer of metal-/metalloid-carbide obtained by treating it at high temperature under inert atmosphere, wherein the coating layer has increased interfacial boding force to the carbonaceous material and thus shows minimized reactivity to lithium. The carbonaceous material as anode active material can minimize the irreversible anode capacity needed for the formation of an SEI film during the first charge/discharge cycle, thereby providing high capacity, high efficiency and significantly improved anode qualities.

Anode active material with improved electrochemical properties and electrochemical device comprising the same

Disclosed is a method for regulating terminal voltage of a cathode during overdischarge. Also disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.

Method for regulating terminal voltage of cathode during overdischarge and cathode active material for lithium secondary battery

Disclosed is a compound represented by the following formula 1: 

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Daejeon, South Korea

Hyeong Jin Kim