The present invention relates to: a compound represented by chemical formula I disclosed in the present specification, wherein the compound can reduce the flammability of a non-aqueous electrolytic solution when included in the non-aqueous electrolytic solution, and can improve the lifespan characteristics of a battery by forming an electrode-electrolyte interface that has a low resistance and is stable even at high temperatures; a non-aqueous electrolytic solution comprising same; and a lithium secondary battery.