Electrolyte additive, electrolyte, and lithium ion secondary battery including same

Abstract

Provided is an electrolyte additive, including a compound of formula (1), wherein R1 is selected from a substituted or unsubstituted five-membered heterocyclic group, a substituted or unsubstituted six-membered heterocyclic group, or a substituted or unsubstituted amino group; L is a sulfone group, a sulfate ester group, or a sulfonate ester group; and R2 is selected from a substituted or unsubstituted C1-18 alkyl group, a substituted or unsubstituted C1-18 alkoxy group, a substituted or unsubstituted conjugated five-membered carbocyclic group or heterocyclic group, a substituted or unsubstituted conjugated six-membered carbocyclic group or heterocyclic group, a di(C1-6 alkyl)amino group, a di(C6-12 aryl)amino group, a tri(C1-6 alkyl)silyl group, a substituted or unsubstituted C3-6 alkenyl group, a substituted or unsubstituted C3-6 alkynyl group, or a substituted or unsubstituted ester group. The electrolyte additive, electrolyte, and lithium ion secondary battery comprising same of the present disclosure achieve better protection of electrodes, improve the cycle performance of the battery, and achieve lower post-cycle impedance. R1-L-R2  (1)

Dependencies are inferred from the claim text.