Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

摘要

Disclosed is a non-aqueous electrolyte solution for a lithium secondary battery. The non-aqueous electrolyte solution includes a lithium salt, an organic solvent and additives. The additives include: 1 to 10% by weight of a mixture of a particular halogenated cyclic carbonate and a compound containing a vinylene or vinyl group; and 0.1 to 9% by weight of a nitrile compound having a C2-C12 alkoxyalkyl group. A lithium secondary battery including the non-aqueous electrolyte solution is also disclosed. The lithium secondary battery is protected from catching fire when overcharged and is prevented from swelling during storage at high temperature.

主权项

1. A non-aqueous electrolyte solution for a lithium secondary battery comprising an ionizable lithium salt, an organic solvent and additives wherein the additives comprise
(a) 1 to 10% by weight of a mixture of a halogenated cyclic carbonate represented by Formula 1:wherein X and Y are each independently hydrogen, chlorine or fluorine, with the proviso that X and Y are not simultaneously hydrogen, and a compound containing a vinylene or vinyl group, based on the total weight of the non-aqueous electrolyte solution, and
(b) 0.1 to 9% by weight of a nitrile compound having a C2-C12 alkoxyalkyl group, based on the total weight of the non-aqueous electrolyte solution, wherein the halogenated cyclic carbonate and the vinylene or vinyl group-containing compound are mixed in a weight ratio of 1:0.5 to 1:5.