All electrochemical tests were performed with 1 M lithium hexafluorophosphate (LiPF6) in ethylene carbonate and ethyl methyl carbonate electrolyte (EC:EMC, 30:70 wt. %) with 2 wt. % vinylene carbonate (VC) additive (Elyte, Germany); for the REs test, ferrocene (≥ 99% purity, AlfaAesar, Germany) was added to the same electrolyte to obtain a 1 mM solution. The detailed description of WE, CE and RE preparation procedure is available in the Supporting Information.