Electrolyte, preparation method thereof and lithium ion battery

Abstract

An electrolyte, a preparation method thereof and a lithium ion battery, where the electrolyte comprises a solvent, a lithium salt, and a first additive shown in Formula 1; in Formula 1, Rand Rare each independently selected from a substituted or unsubstituted C-Calkyl group, (—CH—O—CH—)or is a direct bond, and 1≤n≤5; Ris selected from one of —NH—, —CH—, —SiH—, —BH— and —PH—. The electrolyte has simple composition, and can not only enable the lithium ion battery to maintain excellent cycle performance at high voltages, but also effectively inhibit the lithium ion battery from overproducing gas so as to optimize storage performance.