FIG. 4b): Coulombic efficiency of LiNi0.5Mn1.5O4/Graphite cells (C/5, cutoff potentials at 25° C. and 45° C. 4.80 V?4.25 V vs. LiC6/C6) using the baseline electrolyte without (squares) or with 0.1 wt.-% 2-TFP SO3 (circles).
FIG. 5a): Cycling retention of LiNi0.5Mn1.5O4/Graphite cells (C/5, cutoff potentials at 25° C. and 45° C. 4.80 V?4.25 V vs. LiC6/C6) using the baseline electrolyte without (squares) or with 0.1 wt.-% 4-VP SO3 (circles).
FIG. 5b): Coulombic efficiency of LiNi0.5Mn1.5O4/Graphite cells (C/5, cutoff potentials at 25° C. and 45° C. 4.80 V?4.25 V vs. LiC6/C6) using the baseline electrolyte without (squares) or with 0.1 wt.-% 4-VP SO3 (circles).
DETAILED DESCRIPTION
The electrolyte composition according to the present invention contains
(i) at least one aprotic organic solvent;
(ii) at least one conducting salt;
(iii) at least one pyridine-SO3 complex of formula (I)
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