Electrolytic solution and lithium-ion battery

An electrolytic solution comprising an electrolyte, a solvent and additives, the additives comprising an additive A and an additive B, the additive A being at least one of compounds represented by Formula Ia, the additive B being at least one of compounds represented by Formula II:

• wherein R1, R2, R3, R4, R5, R6, and R7, when present, are each independently selected from the group consisting of hydrogen, halogen, a substituted or unsubstituted C1-C10 alkyl, a substituted or unsubstituted C1-C10 alkoxy, a substituted or unsubstituted C6-C20 aryl, and a substituted or unsubstituted C3-C20 heterocyclic group,
• R4 and R5 are optionally bonded together to form a five-membered or six-membered ring,
• R6 and R7 are optionally bonded together to form a five-membered or six-membered ring,
• at least one of A, B, D, E or G is selected from the group consisting of nitrogen and oxygen, while the remains are carbon;
• R8, R9, R10 and R11 are each independently selected from the group consisting of hydrogen, halogen, and a substituted or unsubstituted C1-C6 alkyl, at least one of R8, R9, R10 or R11 is halogen, and n is 0, 1, 2, 3, 4, or 5, and
• wherein the substituent of the above groups, if present, is selected from the group consisting of halogen, cyano group, C1-C6 alkyl, C2-C6 alkenyl, C1-C6 alkoxy, and combinations thereof.