JPWO2021099714A5 - - Google Patents

Claims (19)

-i) at least one lithium salt;
-ii) at least one non-aqueous solvent;
-iii) at least one product from the reaction of the mixture;
An electrolyte composition comprising
said mixture a)
a1) _C2 - _C24 linear aliphatic diamines, and/or a2) _C6 - _C18 cycloaliphatic diamines, and/or a3) aromatic diamines, preferably _C6 - _C24 aromatic diamines. at least one diamine;
b) at least one _C3 - _C36 saturated hydroxylated carboxylic acid;
c) at least one monovalent acid selected from _C2 - _C18 saturated linear and non-hydroxylated carboxylic acids;
An electrolyte composition, wherein the composition has a viscosity measured at 23° C. in the range of 10 ¹ to 10 ⁷ mPa·s. Lithium salts include LiPF ₆ (lithium hexafluorophosphate), LiFSI, LiTDI, LiTFSI (lithium bis(trifluorosulfonyl)imide), LiPOF ₂ , LiB(C ₂ O ₄ ) ₂ , LiF ₂ B(C ₂ O ₄ ) ₂ , LiBF ₄ , LiNO ₃ , LiClO ₄ , and mixtures thereof. 3. Electrolyte composition according to claim 1 or 2, characterized in that the lithium salt is LiFSI. of claims 1 to 3, characterized in that the total molar concentration of lithium salts in the electrolyte composition is in the range from 0.01 mol/l to 5 mol/l, preferably from 0.05 mol/l to 3 mol/l. An electrolyte composition according to any one of claims 1 to 3. Non-aqueous solvents include ethers, esters, carbonates, ketones, partially hydrogenated hydrocarbons, nitriles, amides, sulfoxides, sulfolane, nitromethane, 1,3-dimethyl-2-imidazolidinone, 1,3-dimethyl-3,4 ,5,6-tetrahydro-2(1H)-pyrimidinone, 3-methyl-2-oxazolidinone, and mixtures thereof. The electrolyte composition described. 6. Electrolyte composition according to any one of the preceding claims, characterized in that the non-aqueous solvent is selected from the group consisting of carbonates, ethers and mixtures thereof. The total weight content of the non-aqueous solvent in the electrolyte composition is 40% (by weight) or more, preferably 50% (by weight) or more, advantageously 60% (by weight) relative to the total weight of the composition The electrolyte composition according to any one of claims 1 to 6, characterized by the above. The linear aliphatic diamine a1) is selected from the group consisting of ethylenediamine, propylenediamine, butylenediamine (or tetramethylenediamine), pentamethylenediamine, hexamethylenediamine, even more preferably the linear aliphatic diamine is ethylenediamine. 8. The electrolyte composition according to any one of claims 1 to 7, characterized in that C ₃ to C ₃₆ saturated hydroxylated carboxylic acids b) are 12-hydroxystearic acid (12-HSA), 9-hydroxystearic acid or 10-hydroxystearic acid (9-HSA or 10-HSA), 14-hydroxyeico Electrolyte composition according to any one of the preceding claims, characterized in that it is selected from the group consisting of sanic acid (14-HEA), and mixtures thereof. Claim characterized in that the monovalent acid c) is selected from acetic acid, propionic acid, butyric acid, pentanoic acid, hexanoic acid (caproic acid), heptanoic acid, octanoic acid, decanoic acid and mixtures thereof. 10. The electrolyte composition according to any one of 1 to 9. Even more preferentially, the molar ratio value of diamine a)/(saturated hydroxylated carboxylic acid b+monohydric acid c) is in the range from 0.9 to 1.1, preferably from 0.95 to 1.05 11. Electrolyte composition according to any one of claims 1 to 10, characterized in that the molar ratio of to is 1:1. a) at least one _C2 - _C24 linear aliphatic diamine, preferably selected from hexamethylenediamine and ethylenediamine;
b) at least one _C3 - _C36 saturated hydroxylated carboxylic acid;
c) at least one monovalent acid selected from _C2 - _C18 saturated linear and non-hydroxylated carboxylic acids;
12. Electrolyte composition according to any one of the preceding claims, characterized in that it comprises at least one product from the reaction of a mixture containing the total weight content of the reaction product (iii) in the electrolyte composition is 0.5% to 20% (by weight), preferably 1% to 15% (by weight), relative to the total weight of the composition; Electrolyte composition according to any one of claims 1 to 12, characterized even more preferentially in the range from 2% to 10% (by weight). that the molar ratio value of saturated hydroxylated carboxylic acid b/(saturated hydroxylated carboxylic acid b+monovalent acid c) is in the range of 0.01 to 0.99, preferably 0.05 to 0.95; 14. Electrolyte composition according to any one of claims 1 to 13, characterized in that. fluoroethylene carbonate, vinylene carbonate, difluoroethylene carbonate, 4-vinyl-1,3-dioxolan-2-one, pyridazine, vinylpyridazine, quinoline, vinylquinoline, butadiene, sebaconitrile, alkyl disulfide, fluorotoluene, 1,4-dimethoxy Tetrafluorotoluene, t-butylphenol, di-t-butylphenol, tris(pentafluorophenyl)borane, oxime, aliphatic epoxide, halogenated biphenyl, methacrylic acid, allylethyl carbonate, vinyl acetate, divinyl adipate, acrylonitrile, 2-vinyl preferably from the group consisting of pyridine, maleic anhydride, methyl cinnamate, phosphonates, vinyl-containing silane compounds, 2-cyanofuran, lithium bis(oxalato)borate, lithium difluoro(oxalato)borate, LiPO ₂ F ₂ , and mixtures thereof 15. The electrolyte composition according to any one of claims 1 to 14, characterized in that is comprises at least one selected electrolyte additive. An electrochemical cell comprising a negative electrode, a positive electrode, and in particular an electrolyte composition according to any one of claims 1 to 15 interposed between the negative electrode and the positive electrode. 17. A cell according to claim 16, characterized in that the negative electrode contains lithium as electrochemically active material. A battery, preferably a lithium-ion battery, comprising an electrochemical cell according to claim 16 or 17. 16. Electrolyte according to any one of claims 1 to 15 in an electrochemical cell having at least one negative electrode containing lithium, in particular metallic lithium, for reducing or eliminating the growth of lithium dendrites on the surface of the electrode. Use of the composition.