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

Disclosed is a compound represented by the following formula 1: wherein, each of R 1 ˜R 13 independently represents —H, —F, —Cl, —Br, —I, —OH, —SH, —COOH, —PO 3 H 2 , —NH 2 , —NO 2 , —O(CH 2 CH 2 O) n H (wherein, n is an integer of 1˜5), C 1 ˜C 12 alkyl group, C 1 ˜C 12 aminoalkyl group, C 1 ˜C 12 hydroxyalkyl group, C 1 ˜C 12 haloalkyl group, C 2 ˜C 12 alkenyl group, C 1 ˜C 12 alkoxy group, C 1 ˜C 12 alkylamino group, C 1 ˜C 12 dialkylamino group, C 6 ˜C 18 aryl group, C 6 ˜C 18 aminoaryl group, C 6 ˜C 18 hydroxyaryl group, C 6 ˜C 18 haloaryl group, C 7 ˜C 18 benzyl group, C 7 ˜C 18 aminobenzyl group, C 7 ˜C 18 hydroxybenzyl group, C 7 ˜C 18 halobenzyl group, or nitrile group (—CN); and at least one of R 4 ˜R 13 is nitrile group (—CN). A non-aqueous electrolyte comprising: (i) a lithium salt, (ii) a solvent, and (iii) a compound represented by formula 1; and a secondary battery comprising the non-aqueous electrolyte are also disclosed. When the compound represented by formula 1 is added to a non-aqueous electrolyte, it is possible to improve the safety of a secondary battery in an overcharged state.