Electrolyte taking propylene carbonate as main solvent

The invention relates to the technical field of lithium battery materials, in particular to an electrolyte taking propylene carbonate as a main solvent. The electrolyte is composed of an organic solvent, a lithium salt and an additive, the organic solvent adopts propylene carbonate and chain carbonate, and the additive adopts vinyl ethylene sulfite and polystyrene; the vinyl ethylene sulfite is novel organic molecules containing unsaturated double bonds and sulfite bifunctional groups and have lower lowest unoccupied molecular orbital energy, electrons are easier to obtain, so the vinyl ethylene sulfite is superior to the propylene carbonate to be reduced on the surface of graphite to form an SEI film, and damage of the propylene carbonate and solvated lithium ions to a graphite structureis prevented; the polystyrene enables a reduction product of the electrolyte to be deposited on the surface of an electrode uniformly and compactly, which is superior to the formation of a compact SEIfilm with the propylene c