For the reproducibility tests a gold thin-film substrate was selected as a standard WE because it can be used as a model anode material: it has already been successfully used to investigate SEI formation mechanisms and properties in lithium-ion batteries , but also its electrochemical activity and the ability to store lithium with alloying have been well studied . The lithiation process has two well-distinguished plateaus, making the charging process more controllable and allowing to avoid the lithium metal plating; a wide voltage window and high electrical conductivity enables the usage of ferrocene as a reference redox couple; ease of thin-film preparation without any additional treatment; and the color change during the alloying process promotes the control of the wetted area. Furthermore, the gained insights from the experiments with a gold anode can be used for understanding the lithium ions intercalation and deintercalation processes in other prospective negative electrode materials, which are suffering from extreme volume change, such as Si or Sn .