Lg Chem, Ltd

Soo Jin Yoon

Ho Chun Lee

Hong Kyu Park

Tae Yoon Park

Yong Su Choi

Jeong Ju Cho

Jeong Ae Ahn

Hyun Min Jung

Disclosed is a lithium secondary battery comprising a cathode, an anode, an electrolyte and a separator, wherein the anode comprises an anode active material having a specific surface area of 3 m/g or less, and the electrolyte comprises 0.1&#x2dc;6 parts by weight of a propane sultone-based compound based on 100 parts by weight of the electrolyte. The lithium secondary battery solves the problem of performance degradation caused by the use of an increased amount of a propane sultone-based compound required to form a SEI film on the surface of an anode upon the first charge cycle. Also, the lithium secondary battery can provide improved cycle characteristics and high-temperature storage characteristics.

Nonaqueous electrolyte for improving performance and lithium secondary battery comprising the same

Disclosed is an electrolyte for a secondary battery comprising an electrolyte salt and an electrolyte solvent, the electrolyte further comprising a lactam-based compound substituted with an electron withdrawing group (EWG) at the nitrogen position thereof. The electrolyte allows formation of a firm and dense SEI film on the surface of an anode, minimizes irreversible oxidative decomposition at a cathode, and thus can provide a battery with significantly improved lifespan, stability and high temperature characteristics.

Electrode for a secondary battery and secondary battery comprising the same

Disclosed is an electrolyte for batteries, which comprises: (a) an electrolyte salt; (b) an electrolyte solvent; and (c) a sulfonate-based compound containing at least one electron withdrawing group (EWG) selected from the group consisting of a cyano group (&#x2014;CN), an isocyanate group (&#x2014;NCO), a thiocyanate group (&#x2014;SCN) and an isothiocyanate group (&#x2014;NCS). An electrode comprising the sulfonate-based compound or a chemical reaction product thereof, partially or totally formed on the surface thereof, and an electrochemical device comprising the electrolyte and/or the electrode are also disclosed. The electrochemical device using the sulfonate-based compound containing a cyano group, an isocyanate group, a thiocyanate group and/or an isothiocyanate group as an additive for electrolytes can provide significantly improved high-temperature lifespan characteristics.

Additives for non-aqueous electrolytes and electrochemical device using the same

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Gwangju-si, South Korea

Soo Jin Yoon