Electrolyte containing styrene and derivative thereof and lithium secondary battery using electrolyte

The invention belongs to the field of lithium secondary battery materials and discloses electrolyte containing styrene and a derivative thereof and a lithium secondary battery using the electrolyte. The electrolyte comprises an organic solvent, electrolyte lithium salt, styrene and a derivative and a functional additive thereof. A structural formula of styrene and the derivative thereof is as shown in formula (1), wherein R1, R2, R3, R4 and R5 are respectively independently hydrogen, halogen, C1-C20 alkyl or halogenated alkyl, C6-C26 aryl or halogenated aryl, C1-C4 nitrile groups, amino or alkoxy. Styrene and the derivative thereof are added into the electrolyte, and a stable passive film is formed on the surface of an electrode, so that the battery has low internal resistance while having good cycle performance. Formula (1).