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

摘要

A non-aqueous electrolyte solution for a lithium secondary battery includes a non-aqueous solvent and a lithium salt dissolved in the non-aqueous solvent. The lithium salt includes LiN(CF3SO2)2. The non-aqueous electrolyte solution further includes a sulfate-based compound and vinylene carbonate. A lithium secondary battery having the above non-aqueous electrolyte solution may keep overall high temperature performance in a high level and also improve low temperature power characteristics.

主权项

1. A non-aqueous electrolyte solution for a lithium secondary battery comprising a non-aqueous solvent and additives comprising:
(A) a lithium salt; (B) a sulfate-based compound expressed by the following Chemistry Figure 1, where n is an integer in the range from 2 to 5; and (C) vinylene carbonate; wherein the lithium salt comprises a mixture of:
(1) 0.1 to 0.5 mol LiN(CF3SO2)2 based on 1 mol total of lithium salts present in the mixture; and(2) 0.5 to 0.9 mol of LiPF6, based on 1 mol total of lithium salts present in the mixture.