Electrolyte solution and secondary battery

Abstract

An electrolyte solution and a secondary battery. The electrolyte solution comprises an electrolyte, an additive and a solvent. The additive comprises a first additive and a second additive, wherein the first additive is selected from a compound represented by formula I, and the second additive is a compound containing an unsaturated carbon-carbon bond. The first additive and the second additive produce a synergistic effect, which facilitates the formation of a network-like solid-state electrolyte interface membrane, thereby effectively alleviating the volume expansion of a battery during high-temperature storage and significantly improving the cycle performance of the secondary battery.

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