Lg Chem, Ltd

Hochun Lee

Jeong-Ju Cho

Joomi Jeon

Jisang Yu

Jonghwan Kim

Ra Young Hwang

Sunghoon Yu

Sujin Yoon

Yongsu Choi

Hong-Kyu Park

Sung Kyun Chang

Soojin Kim

Mi Young Son

Miyoung Son

Hyeongjin Kim

Disclosed is a secondary battery including an electrolyte and/or an electrode, the electrolyte including an electrolyte salt and an electrolyte solvent, i) a cyclic carbonate compound substituted with at least one halogen element; and ii) a compound containing a vinyl group in a molecule thereof, and the electrode including a solid electrolyte interface (SEI) layer partially or totally formed on the surface thereof by electrical reduction of the two compounds.

Non-aqueous electrolyte and secondary battery comprising the same

Disclosed are an electrolyte for a secondary battery, and a secondary battery including the same, the electrolyte including an electrolyte salt; an electrolyte solvent; and a compound generating heat through oxidation at voltages higher than drive voltage of a cathode, wherein the compound can decompose or evaporate electrolyte components by oxidation heat, thereby causing gas generation. Also, the compound is included in an internal pressure increase accelerant for a battery. Upon overcharge, since a compound subjected to oxidation at voltages higher than normal drive voltage of a cathode generates heat, electrolyte components can be decomposed or evaporated, thereby generating gas by the oxidation heat. Accordingly, it is possible to operate a safety means of a battery, without using an internal pressure increasing material directly generating gas through oxidation at overcharge voltage as the electrolyte additive, and thus to improve the overcharge safety of a secondary battery.

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

Disclosed is a lithium secondary battery comprising a cathode including a lithium-containing transition metal oxide, an anode including a carbon-based material, and a non-aqueous electrolyte with addition of a compound (A) and a compound (B) of formula (1). Incorporation of the compounds (A) and (B) into the electrolyte significantly improves the high-temperature performance and cycle life characteristics of the battery.

Lithium secondary battery of improved high-temperature cycle life characteristics

Disclosed herein is a lithium secondary cell including 20 to 100 wt. % of lithium transition metal oxide represented by a formula of LiNiMnMeO, relative to a total amount of a cathode active material, as well as an electrolyte consisting of a lithium salt and a non-aqueous solvent, wherein a first additive to form a protective film (that is, a solid electrolyte interface film: SEI film) over a surface of an anode active material and a second additive to form another SEI film over the surface of the anode active material while inactivating impurities contained in the cathode active material are included in the electrolyte.

Lithium secondary battery with improved cell characteristics

Disclosed is a lithium secondary battery comprising a cathode including a lithium-containing transition metal oxide, an anode including a carbon-based material, and a non-aqueous electrolyte with addition of a compound of formula (1). Incorporation of the compound (1) into the electrolyte significantly improves the high-temperature performance and cycle life characteristics of the battery.

Provided is a lithium secondary battery comprising a controlled-release capsule which continuously releases a desired amount of additives necessary for electrolytes or electrodes at a constant level and is included in an electrolyte and/or an electrode material, thereby providing inherent effects of additives while simultaneously minimizing adverse side reactions of surplus additives, consequently optimizing the battery performance.

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Daejeon, South Korea

Hochun Lee