| 摘要 |
The present invention relates to a non-aqueous electrolyte solution and a lithium secondary battery including the same and, more specifically, a non-aqueous electrolyte solution for a lithium secondary battery, comprising a lithium salt which includes lithuim bis(fluorosulfonyl)imide (LiFSI) which is a first lithium salt and lithium hexafluorophosphate (LiPF_6) which is second lithium salt in mole ratio of 9 to 1 or 1 to 1; and a non-aqueous solvent which includes ethyl propionate, propyl propionate or a propionate based solvent and a carbonate based solvent which are mixtures thereof, and a lithium secondary battery including the same. The non-aqueous electrolyte solution for a lithium secondary battery uses a propionate based solvent which hardly causes a film forming reaction, compared with a carbonate-based solvent, and electrolyte salt which is lithuim bis(fluorosulfonyl)imide (LiFSI) together, thereby improving stability of films in passivity. In addition, the non-aqueous electrolyte solution uses LiPF_6 having enough fluorine as electrolyte salt and accordingly resolves corrosion of current collectors generated when imide-based electrolyte salt is used, thereby improving long-term performance of lithium secondary batteries. |
