Patent ID: 9478828
Filing Date: 2016-10-25
CPC Classification: H01M,Y02E

Claim Text:
1. An electrolyte for a rechargeable lithium battery, comprising a lithium salt; an organic solvent; and an additive, wherein the organic solvent consists of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether, monofluoroethylene carbonate and dimethyl carbonate, wherein 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether is included in an amount of 30 volume % to 60 volume % based on total amount of the organic solvent and monofluoroethylene carbonate is included an amount of 10 volume % to 30 volume % based on total amount of the organic solvent, and the additive is a first lithium compound including a bissulfonyl imide anion and a lithium ion, and a second lithium compound including a complex anion said complex anion including a dicarboxylate anion coordinated on a center atom, and a lithium ion, wherein the first lithium compound is included in an amount of 0.2 parts by weight to 5.0 parts by weight based on 100 parts by weight of the total weight of the lithium salt and the organic solvent, wherein the second lithium compound is included in an amount of 0.2 parts by weight to 2.0 parts by weight based on 100 parts by weight of the total weight of the lithium salt and the organic solvent, wherein the bissulfonyl imide anion is represented by Chemical Formula 1: wherein, Rf wherein the second lithium compound is represented by Chemical Formula 9: wherein, M is a phosphorus atom, m is 2, n is 2, and p is 0 or 1.