Non-aqueous electrolyte additive and application thereof

The invention provides a non-aqueous electrolyte additive which is selected from at least one of compounds as shown in a structural formula I: # imgabs0 #, in which R1 and R2 are independently selected from carbonyl, sulfinyl and sulfuryl respectively; r3 is selected from a carbonyl group, a sulfinyl group, a sulfuryl group, a phosphoryl group, a boryl group and a silicoyl group; x and Y are respectively and independently selected from H, halogen atoms and C1-C5 substituted or unsubstituted alkyl. The non-aqueous electrolyte additive provided by the invention can greatly improve film formation of the non-aqueous electrolyte on a positive electrode and a negative electrode under a small addition amount, the formed SEI film is high in integrity, uniform in film thickness and good in metal ion permeability, the SEI film may be more uniform on the atomic scale, the metal ion conduction rate can be increased, and the service life of the SEI film is prolonged. The stability of the battery material is improved; the