Sulfone Based-Electrolytes for Lithium-Ion Batteries: Cycling Performances and Passivation Layer Quality of Graphite and LiNi1/3Mn1/3Co1/3O2 Electrodes

The solvent 3-methoxytetrahydrothiophene 1, 1-dioxide (MESL) was synthesized and its cycling performances of grapshite and LiNi1/3Mn1/3Co1/3O2 (NMC) electrodes were investigated in view of the high anodic stability of MESL in the presence of lithium bis-trifluoromethanesulfonimidate (LiTFSI). Galvanostatic charge-discharge of graphite electrode was possible in MESL + LiTFSI (1 M) only in the presence of 5% (vol.) fluoroethylene carbonate (FEC) at 40 °C. On the other hand, a good cycling ability of NMC electrode with this electrolyte was observed at room temperature even at a cut-off voltage of 4.5 V vs Li+/Li. However, it was necessary to reduce the cut-off voltage from 4.5 V to 4.3 V vs Li+/Li in order to keep a good cycling ability