Non-Aqueous Electrolyte Solution for Lithium Secondary Battery and Lithium Secondary Battery Comprising Same

A non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte for a lithium secondary battery includes a lithium salt, an organic solvent, and an additive comprising a compound represented by the following Chemical Formula 1: wherein Q is a single bond, or a substituted or non-substituted C1-C10 alkyl group, and each of A1, A2 and A3 independently represents hydrogen (H) or a substituted or non-substituted C1-C10 alkyl group. The non-aqueous electrolyte can scavenge decomposition products of lithium salt to maintain passivation of an SEI film during high-temperature storage. The non-aqueous electrolyte improves battery performance by improving self-discharge phenomenon caused by elution from a positive electrode and breakage of the SEI film at a negative electrode. The battery has improved initial efficiency by formation of an initial coating film to inhibit additional electrolyte decomposition.