Lg Chem, Ltd

Yong Jeong Kim

Jong Hee Kim

Dongmyung Kim

Seung W Chu

Bora Shin

Joo-Hwan Sung

Hyungook Yoon

Sung-Pil Yoon

Dohyun Lee

Kwonyoung Choi

Dong Myung Oh

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

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Daejeon, South Korea

Yong Jeong Kim