Kyle R. Crompton said:
It is important to note here that determined values of the onset potential for copper dissolution can vary since the choice of an oxidative current density threshold is arbitrary and non-faradaic process can contribute to the oxidative current. Additionally, the exact value of the onset of copper dissolution can be affected by factors such as ambient conditions and electrolyte composition. In the present work, 3.1 V vs. Li/Li+ will be assigned for interpretation purposes as below this value, no oxidative current was observed in the linear sweep voltammogram in Figure 9d, and therefore, no copper dissolution is expected to be occurring.
The adverse effects from copper ions being present in the electrolyte will lead to side reactions with the electrolyte, competitive reduction processes with lithium ions, and copper dendrite formation which can lead to internal shorting. Each of these effects can cause significant damage to the cell and reduce its recharge capacity and performance.[85–91]. Thus, for cells to be tolerant to near zero volt storage, cell design must be modified or different materials used to avoid the copper dissolution degradation mechanism.