# US 7,745,055 B2 · Electrolyte for rechargeable lithium battery and rechargeable lithium battery comprising same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,745,055 B2 - Document ID: US7745055B2 - Status: Granted - Kind: B2 - Application number: 10/980,116 - Filed: 2004-11-01 - Published: 2005-06-30 - Granted: 2010-06-29 - Earliest claimed: 2003-10-31 - Assignees: Samsung SDI Co., Ltd. - Inventors: Jin-Hee Kim; Jin-Sung Kim - Web page: https://patentgrep.com/patent/US7745055B2 ## CPC - H01M 10/052: Li-accumulators - H01M 6/164: {by the solvent} - H01M 6/168: {by additives} - 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 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)} - H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof - H01M 4/587: for inserting or intercalating light metals - H01M 10/0569: characterised by the solvents - H01M 2300/0025: Organic electrolyte - H01M 2300/0034: Fluorinated solvents - H01M 2300/0037: Mixture of 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 Disclosed is an electrolyte for a rechargeable lithium battery including: a first additive having an oxidation potential of 4.1 to 4.6V; a second additive having an oxidation potential of 4.4 to 5.0V; a non-aqueous organic solvent; and a lithium salt. ## Claims ### Claim 1 An electrolyte for a rechargeable lithium battery, comprising: a first additive having an oxidation potential from 4.1 to 4.6V, wherein the first additive comprises a compound selected from the group consisting of Formula 1, Formula 2, and combinations thereof: where R1 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups; R4 is selected from the group consisting of: C1-C6 alkyl groups, where R6 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups, and —OR7 where R7 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups; and R5 is selected from the group consisting of C1-C6 alkyl groups and C2-C6 alkylene groups; a second additive having an oxidation potential from 4,4 to 5.OV; a non-aqueous organic solvent; and a lithium salt. ### Claim 2 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the first additive has an oxidation potential from 4.1 to 4.4V. ### Claim 3 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the first additive has an oxidation potential from 4.2 to 4.4V. ### Claim 4 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the second additive has an oxidation potential from 4.6 to 5.0V. ### Claim 5 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the second additive has an oxidation potential from 4.7 to 4.9V. ### Claim 6 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the oxidation potential of the first additive is from 0.1 to 0.7V less than the oxidation potential of the second additive. ### Claim 7 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the oxidation potential of the first additive is from 0.3 to 0.7V less than the oxidation potential of the second additive. ### Claim 8 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the electrolyte has an oxidation potential from 4.4 to 4.9V. ### Claim 9 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the electrolyte has an oxidation potential from 4.5 to 4.7V. ### Claim 10 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the first additive comprises a compound selected from the group consisting of Formulae 2 to 4, and combinations thereof: where R5 is selected from the group consisting of C1-C6 alkyl groups and C2-C6 alkylene groups; R1 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups; R6 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups; and R7 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups. ### Claim 11 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the first additive comprises a compound of Formula 2. ### Claim 12 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the second additive comprises at least one compound selected from the group consisting of compounds represented by Formulae 5 to 9: where X is selected from the group consisting of Cl, Br, and F; R9 is selected from the group consisting of C1-C6 alkyl groups and C2-C6 alkylene groups; R2 is selected from the group consisting of C1-C6 alkyl groups, alkoxy groups, and alkylene groups; R3 is selected from the group consisting of C1-C6 alkyl groups C2-C6 alkylene groups; R10 is selected from the group consisting of C1-C6 alkyl groups, and A is selected from the group consisting of SO2, CH2, C═O, and CF2. ### Claim 13 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the second additive comprises at least one compound selected from the group consisting of compounds represented by Formulae 5, and 10 to 13: where X is selected from the group consisting of Cl, Br, and F; and each of R9, R11, R12, and R13 is independently selected from the group consisting of C1-C6 alkyl groups and C2-C6 alkylene groups. ### Claim 14 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the second additive is represented by Formula 5: selected from the group consisting of Cl, Br and F; and R9 is selected from the group of C1-C6 alkyl groups and C2-C6 alkylene groups. ### Claim 15 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the combined amount of the first additive and the second additive is 0.01 to 20% by weight based on the total weight of the non-aqueous organic solvent and the lithium salt. ### Claim 16 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the combined amount of the first additive and the second additive is 0.1 to 10% by weight based on the total weight of the non-aqueous organic solvent and the lithium salt. ### Claim 17 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the combined amount of the first additive and the second additive is 5 to 10% by weight based on the total weight of the non-aqueous organic solvent and the lithium salt. ### Claim 18 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the second additive and the first additive are mixed at a weight ratio of 20: 0.1 to 3:2. ### Claim 19 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the electrolyte comprises 0.1 to 5% by weight of the first additive and 1 to 20% by weight of the second additive. ### Claim 20 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the non-aqueous organic solvent is selected from the group consisting of carbonates, esters, ethers, ketones and combinations thereof. ### Claim 21 (depends on 20) The electrolyte for a rechargeable lithium battery according to claim 20, wherein the non-aqueous organic solvent is a carbonate selected from the group consisting of dimethyl carbonate, diethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, methylethyl carbonate, ethylene carbonate, propylene carbonate, butylene carbonate and combinations thereof. ### Claim 22 (depends on 20) The electrolyte for a rechargeable lithium battery according to claim 20, wherein the non-aqueous organic solvent comprises a mixed solvent of cyclic carbonates and chain carbonates. ### Claim 23 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the non-aqueous organic solvent is a mixed solvent of a carbonate solvent and an aromatic hydrocarbon organic solvent. ### Claim 24 (depends on 23) The electrolyte for a rechargeable lithium battery according to claim 23, wherein the aromatic hydrocarbon organic solvent is a compound represented by Formula 14: where R14 is selected from the group consisting of halogens and C1-C10 alkyl groups and n is an integer from 0 to 6. ### Claim 25 (depends on 23) The electrolyte for a rechargeable lithium battery according to claim 23, wherein the aromatic hydrocarbon organic solvent is selected from the group consisting of benzene, fluorobenzene, chlorobenzene, nitrobenzene, toluene, fluorotoluene, trifluorotoluene, xylene and mixtures thereof. ### Claim 26 (depends on 23) The electrolyte for a rechargeable lithium battery according to claim 23, wherein the carbonate solvent and an aromatic hydrocarbon organic solvent are mixed in a volume ratio between 1:1 and 30:1. ### Claim 27 (depends on 1) The electrolyte for a rechargeable lithium battery according to claim 1, wherein the lithium salt is selected from the group consisting of LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, CF3SO3Li, LiN(SO2CF3)2, LiC4F9SO3, LiAIO4, LiAlOCI4, LiN(SO2C2F5)2), LiN(CxF2x+1SO2)(CyF2y+1SO2) where x and y are natural numbers, LiCl, LiI and combinations thereof. ### Claim 28 An electrolyte for a rechargeable lithium battery, comprising: a first additive having an oxidation potential of 4.1 to 4.5V, wherein the first additive comprises a compound selected from the group consisting of Formula 1, Formula 2, and combinations thereof: where R1 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups; R4 is selected from the group consisting of: C1-C6 alkyl groups, where R6 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups, and —OR7 where R7 is selected from the group consisting of hydrogen, C1-C6 alkyl groups, and C2-C6 alkylene groups; and R5 is selected from the group consisting of C1-C6 alkyl groups and C2-C6 alkylene groups; a second additive having an oxidation potential from 4.4 to 5.0V; a non-aqueous organic solvent; and a lithium salt, wherein the electrolyte has an oxidation potential from 4.4 to 4.9V. ### Claim 29 (depends on 28) The electrolyte for a rechargeable lithium battery according to claim 28, wherein the electrolyte has an oxidation potential from 4.5 to 4.7V.