The present invention relates to: a non-aqueous electrolyte solution for a lithium secondary battery, which includes a compound represented by Formula 1, a lithium salt, and an organic solvent; and a lithium secondary battery including the same.

The present invention concerns ionic liquids comprising at least one pyrazolium cation which are substituted by at least one fluorine atom and at least one anion obtainable from 4-ethoxy-1,1,1-trifluoro-3-butene-2-one (ETFBO). The ionic liquids according t...