# US 2014/0154591 A1 · Electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0154591 A1 - Document ID: US20140154591A1 - Status: Published application - Kind: A1 - Application number: 14/083,256 - Filed: 2013-11-18 - Published: 2014-06-05 - Earliest claimed: 2012-12-04 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Hokuto Yokotsuji; Hironari Takase - Web page: https://patentgrep.com/patent/US20140154591A1 ## CPC - H01M 10/0569: characterised by the solvents - H01M 4/386: {Silicon or alloys based on silicon} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0567: characterised by the additives - H01M 10/0568: characterised by the solutes - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 2300/0034: Fluorinated solvents - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract In an aspect, an electrolyte that includes a lithium salt, an organic solvent, and an additive is disclosed. ## Claims ### Claim 1 An electrolyte for a rechargeable lithium battery, comprising a lithium salt; an organic solvent; and an additive, wherein the organic solvent comprises a fluorinated ether, and the additive comprises 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. ### Claim 2 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the bissulfonyl imide anion is represented by Chemical Formula 1: wherein, Rf1 and Rf2 are each independently fluorine or a C1 to C4 fluoroalkyl group, or Rf1 and Rf2 are linked to each other to form a ring having a C1 to C4 fluoroalkylene group. ### Claim 3 (depends on 2) The electrolyte for a rechargeable lithium battery of claim 2, wherein the bissulfonyl imide anion is represented by one of the following Chemical Formulas 2 to 8: ### Claim 4 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the dicarboxylate anion is an oxalic acid anion or a malonic acid anion, and the center atom is a boron atom or a phosphorus atom. ### Claim 5 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the second lithium compound is represented by Chemical Formula 9: wherein, M is a boron atom or a phosphorus atom, m is 1, 2 or 3, n is 0, 1, 2, 3, or 4, p is 0 or 1, and when M is a boron atom, 2m+n=4, and M is phosphorus atom, 2m+n=6. ### Claim 6 (depends on 5) The electrolyte for a rechargeable lithium battery of claim 5, wherein the complex anion is represented by one of Chemical Formulas 10 to 13: ### Claim 7 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the first lithium compound is included in an amount of about 0.2 parts by weight to about 5.0 parts by weight based on 100 parts by weight of the total weight of the lithium salt and the organic solvent. ### Claim 8 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the second lithium compound is included in an amount of about 0.2 parts by weight to about 2.0 parts by weight based on 100 parts by weight of the total weight of the lithium salt and the organic solvent. ### Claim 9 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the fluorinated ether comprises 2,2,2-trifluoroethylmethylether, 2,2,2-trifluoroethyldifluoromethylether, 2,2,3,3,3-pentafluoropropylmethylether, 2,2,3,3,3-pentafluoropropyldifluoromethylether, 2,2,3,3,3-pentafluoropropyl-1,1,2,2-tetrafluoroethylether, 1,1,2,2-tetrafluoro ethylmethylether, 1,1,2,2-tetrafluoroethylethylether, 1,1,2,2-tetrafluoroethylpropylether, 1,1,2,2-tetrafluoroethylbutylether, 1,1,2,2-tetrafluoroethylisobutylether, 1,1,2,2-tetrafluoro ethylisopentylether, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoro ethylether, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropylether, hexafluoroisopropylmethylether, 1,1,3,3,3-pentafluoro-2-trifluoromethylpropylmethylether, 1,1,2,3,3,3-hexafluoro propylmethylether, 1,1,2,3,3,3-hexafluoropropylethylether, 2,2,3,4,4,4-hexafluorobutyldifluoromethylether, or a combination thereof. ### Claim 10 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the fluorinated ether is included in an amount of about 30 volume % to about 60 volume % based on total amount of the organic solvent. ### Claim 11 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the organic solvent further comprises fluoroethylene carbonate, linear carbonate, or cyclic carbonate, or a combination thereof, and the fluoroethylene carbonate and the cyclic carbonate are different from each other. ### Claim 12 (depends on 11) The electrolyte for a rechargeable lithium battery of claim 11, wherein when the organic solvent comprises fluoroethylene carbonate the fluoroethylene carbonate is included in an amount of about 10 volume % to about 30 volume % based on total amount of the organic solvent. ### Claim 13 (depends on 1) The electrolyte for a rechargeable lithium battery of claim 1, wherein the lithium salt comprises LiPF6, LiClO4, LiBF4, LiAsF6, LiSbF6, LiSO3CF3, LiN(SO2CF3), LiN(SO2CF2CF3), LiC(SO2CF2CF3)3, LiC(SO2CF3)3, LiI, LiCl, LiF, LiPF5(SO2CF3), or LiPF4(SO2CF3)2, or a combination thereof. ### Claim 14 (depends on 1) A rechargeable lithium battery, comprising a positive electrode including a positive active material; a negative electrode including a negative active material; and the electrolyte according to claim 1. ### Claim 15 (depends on 14) The rechargeable lithium battery of claim 14, wherein the positive active material comprises a compound represented by one of Chemical Formulas 14 to 16: LiaMnxCoyNizO2 [Chemical Formula 14] wherein, 1.150≦a≦1.430, 0.45≦x≦0.6, 0.01≦y≦0.15 and 0.10≦z≦0.39, LiMnxCoyNizO2 [Chemical Formula 15] wherein, 0.3≦x≦0.85, 0.10≦y≦0.3 and 0.10≦z≦0.3, LiMn1.5Ni0.5O4. [Chemical Formula 16] ### Claim 16 (depends on 14) The rechargeable lithium battery of claim 14, wherein the negative active material comprises a silicon-based material. ### Claim 17 (depends on 14) The rechargeable lithium battery of claim 14, wherein the bissulfonyl imide anion is represented by one of Chemical Formulas 2 to 8: ### Claim 18 (depends on 14) The rechargeable lithium battery of claim 14, wherein the dicarboxylate anion is an oxalic acid anion or a malonic acid anion, and the center atom is a boron atom or a phosphorus atom. ### Claim 19 (depends on 14) The rechargeable lithium battery of claim 14, wherein the second lithium compound is represented by Chemical Formula 9: wherein, M is a boron atom or a phosphorus atom, m is 1, 2 or 3, n is 0, 1, 2, 3, or 4, p is 0 or 1, and when M is a boron atom, 2m+n=4, and M is phosphorus atom, 2m+n=6. ### Claim 20 (depends on 19) The rechargeable lithium battery of claim 19, wherein the complex anion is represented by one of Chemical Formulas 10 to 13: