Abstract: The present invention relates to a solid electrolyte interphase composition having a F:CF3 mol-ratio (x) of 0.00<x?12.00; a negative electrode comprising a negative electrode material and a solid electrolyte interphase composition on a surface of said negative electrode material, wherein said solid electrolyte interphase composition has a molar ratio F:CF3 (x) of 0.00<x?12.00, as determined by XPS; as well as its application in a lithium secondary battery cell.

Abstract: The present invention relates to an electrochemical cell comprising a positive electrode, a negative electrode and a liquid electrolyte comprising a specific lithium salt, preferably lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), a fluorinated ether, preferably 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), a cyclic sulfone, preferably sulfolane (SL), and a fluorinated carbonate, preferably fluoroethylene carbonate (FEC), in an amount (x) of 0<x<=15 vol. %, wherein the electrochemical cell has a Coulombic efficiency of at least 93%. The electrolyte used according to the invention results in improved electrochemical properties.

Abstract: The present invention relates to an electrolyte composition suitable for lithium secondary batteries, comprising a specific lithium salt, preferably lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), a fluorinated ether, preferably 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), a cyclic sulfone, preferably sulfolane (SL), and a fluorinated carbonate, preferably fluoroethylene carbonate (FEC), in an amount (x) of 0<x<=15 voL %, wherein the cyclic sulfone/lithium salt is comprised in a molar ratio (y) of 1.0<=y<=5.0 and the fluorinated ether/lithium salt is comprised in a molar ratio (z) of 1.0<=z<=5.0. The electrolyte according to the invention results in improved electrochemical properties.

Abstract: The present invention relates to a solid electrolyte interphase composition having a F:CF3 mol-ratio (x) of 0.00<x?12.00; a negative electrode comprising a negative electrode material and a solid electrolyte interphase composition on a surface of said negative electrode material, wherein said solid electrolyte interphase composition has a molar ratio F:CF3 (x) of 0.00<x?12.00, as determined by XPS; as well as its application in a lithium secondary battery cell.

Abstract: The present invention relates to a sulfolane-based electrolyte composition suitable for Lithium secondary batteries, comprising lithium bis(trifluoromethansolfonyl)imide (LiTFSI) in an amount (x) of 39.0 vol %?x?47.5 vol %, fluoroethylene carbonate (FEC) in an amount (y) of 0<y?15 vol %, equivalent to an amount of 0<y?14.0 wt. %, relative to the total volume, respectively weight, of the electrolyte composition, and sulfolane, wherein SL/LiTFSI is comprised in a molar ratio (z) of 2?z?3.5 as well as its application in a Lithium secondary battery cell.

Abstract: An electrolyte composition suitable for lithium ion secondary batteries comprises lithium bis(trifluoromethansolfonyl)imide (LiTFSI), 1,1,2,2-tetrafluoro-ethyl-2,2,3,3-tetrafluoropropyl ether (TTE), sulfolane (SL) and fluoroethylene carbonate (FEC) in an amount (x) of 0<x?15 vol. %. The composition comprises a molar ratio SL/LiTFSI (y) of 1.0?y?5.0 and a molar ratio TTE/LiTFSI (z) of 1.0?z?5.0. The electrolyte results in improved electrochemical properties.

Abstract: An electrolyte composition suitable for lithium ion secondary batteries comprises lithium bis(trifluoromethansolfonyl)imide (LiTFSI), 1,1,2,2-tetrafluoro-ethyl-2,2,3,3-tetrafluoropropyl ether (TTE), sulfolane (SL) and fluoroethylene carbonate (FEC) in an amount (x) of 0<x?15 vol. %. The composition comprises a molar ratio SL/LiTFSI (y) of 1.0?y?5.0 and a molar ratio TTE/LiTFSI (z) of 1.0?z?5.0. The electrolyte results in improved electrochemical properties.