Both the FEC and the VC have been shown to significantly improve the cycle stability and lifespan of lithium ion batteries. Further investigations on the impact of varying the concentration of both additives have also been done over the past years. Those studies have demonstrated different optimal concentrations for both additives to enhance the cell performance . It is found that for the additive FEC, a volumetric rate of 7 wt.-% is sufficient to boost capacity retention to 82.75 % after 50 cycles. For VC, the optimal concentration is highly application dependent. According to a study by Burns et al. based on LiCoO2/graphite, it is found that 2 wt.-% seem to be an optimal concentration to reach a satisfactory cycling performance. However, they also found that concentrations above 1 wt.-% lead to higher cell impedance. Further investigation on the high VC concentration (~6 wt.-%) show that a tradeoff between lifespan and cell impedance can be observed .