Electrolyte for LI secondary batteries
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.
1 . A sulfolane (SL)-based electrolyte composition suitable for lithium secondary batteries, comprising:
lithium bis(trifluoromethansolfonyl)imide (LiTFSI) in an amount (x) of 37.9 wt. %≤x≤48.9 wt. %, and
fluoroethylene carbonate (FEC) in an amount (y) of 5.2≤y≤14.0 wt. %,
wherein SL/LiTFSI is comprised in a molar ratio (z) of 2.5≤z≤3.5.
2 . The electrolyte composition according to claim 1 , wherein FEC is comprised in an amount (y) of 9.8≤y≤14.0 wt. %.
3 . The electrolyte composition according to claim 1 , wherein FEC is comprised in an amount of 9.8 wt. %.
4 . The electrolyte composition according to claim 1 , wherein SL/LiTFSI is comprised in a molar ratio (z) of 2.5<z<3.5.
5 . The electrolyte composition according to claim 1 , wherein SL/LiTFSI is comprised in a molar ratio (z) of 2.5<z≤3.0.
6 . A lithium secondary battery cell comprising the electrolyte composition according to claim 1 .
7 . A sulfolane (SL)-based electrolyte composition suitable for lithium secondary batteries, consisting of:
lithium bis(trifluoromethansolfonyl)imide (LiTFSI) in an amount (x) of 37.9 wt. %≤x≤48.9 wt. %,
fluoroethylene carbonate (FEC) in an amount (y) of 1.0≤y≤14.0 wt. %, and sulfolane,
wherein SL/LiTFSI is comprised in a molar ratio (z) of 2.0≤z≤3.5.