The present invention provides a non-aqueous electrolyte containing an additive for a non-aqueous electrolyte, the additive being represented by chemical formula 1. [Chemical formula 1] In chemical formula 1, R1 to R5 may be each independently any one selected from the group consisting of H, an alkyl group of 1 to 10 carbon atoms, and an alkoxy group of 1 to 10 carbon atoms, and Rx may be an alkyl group of 1 to 10 carbon atoms substituted with at least one fluorine group or an alkoxy group of 1 to 10 carbon atoms substituted with at least one fluorine group.