Lg Chem, Ltd

Dongmyung Kim

Sung-Min Hwang

Sungjin Kwon

Eun Young Kim

Jong Hee Kim

Joo-Hwan Sung

Yong Jeong Kim

Seung W Chu

Kiwoong Kim

Hyunwoo Cho

Hyeong Jin Kim

Bora Shin

Ki Hong Min

Jihoon Cho

Eun Ho Kim

Hyun-Chul Jung

Suyoung Ryu

Sung-Pil Yoon

Dohyun Lee

Kwonyoung Choi

Dong Myung Oh

Eui Kwang Jeong

Se-Hoon Baek

Hyeong Joon Kim

Hyungook Yoon

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 herein are a winding type electrode assembly ('jelly-roll') constructed in a structure in which a cathode sheet and an anode sheet are wound in a circle while a separator is interposed between the cathode sheet and the anode sheet or the assembly is compressed in one direction after winding, wherein the jelly-roll includes an active material non-coated portion formed at the wound end of the jelly-roll, a conductive tape attached to the wound end of the jelly-roll for covering the wound outside of the jelly-roll including the active material non-coated portion, and an elastic member attached to the inside of the active material non-coated portion, the elastic member having a thickness equivalent to 50 to 200% of the height of an active material layer, and a secondary battery including the same.

Jelly-roll of structure having elastic member adhered on active material-non-coated portion and secondary battery employed with the same

Provided is a secondary battery containing polyalkyleneglycol diglycidylether represented by formula I added in a predetermined amount to an electrolyte for the battery. The secondary battery containing the above additive exhibits remarkably improved high-temperature characteristics, prevents deterioration in rate characteristics and cycle characteristics, and considerably reduces thickness swelling of the battery so as to prevent battery leakage, ultimately enhancing safety of the battery.

Lithium secondary battery containing additive for improved high-temperature characteristics

Disclosed herein is a jelly-roll type electrode assembly ('jelly-roll') of a cathode/separator/anode structure, wherein the jelly-roll is constructed in a structure in which each electrode has active material layers formed on opposite major surfaces of a sheet-type current collector, the loading amount of an active material for the inner active material layer, constituting the inner surface of each sheet when each sheet is wound, is less than that of an active material for the outer active material layer, constituting the outer surface of each sheet when each sheet is wound, and the loading amount of the active material for the inner active material layer gradually increases from the central region of each wound sheet to the outermost region of each wound sheet.

Jelly-roll having active material layer with different loading amount

Provided is a secondary battery comprising a cathode active material having low-electrolyte wettability as a main ingredient, which is capable of improving high-rate discharge properties by an addition of a perfluorinated sulfonamide substituent-containing polymer ('additive') to a cathode mix and/or an electrolyte.

Secondary battery of improved high-rate discharging properties

Growing community of inventors

Daejeon, South Korea

Dongmyung Kim