Lithium secondary battery

Abstract

The present invention provides a lithium secondary battery comprising a cathode electrode containing a lithium complex oxide; an anode electrode containing metal lithium or its alloy, or carbon material; and a nonaquaeous organic electrolyte containing a nonaquaeous organic solvent, a lithium salt and an aromatic ether that can react to form dimers or polymers above a certain temperature and voltage and that can be expressed by Formula 1 below. 1 Wherein, R1 is independently a single bond or an alkaline group with less than and equal to 2 carbons and R2 is hydrogen or an alkyl group with less than and equal to 2 carbons. The lithium secondary battery has the advantage that its characteristics is maintained as it is, even if it is left in their fully charged states at high temperature for a long time and that at the same time its credibility and stability have been improved.

Dependencies are inferred from the claim text.