Fig. 5: SEM-EDX results for lithium plating verification.
From: Operando visualisation of lithium plating by ultrasound imaging of battery cells
a shows SEM images of the samples from markings (2), (6), (8), and (9). Red markings represent samples from the front side of the sheet, while blue markings indicate samples from the back. b shows the corresponding EDX results from representative positions of the samples (At% refers to the atomic fraction of each element within the marked sample). Based on the morphology in the SEM images and EDX analysis, it can be concluded that metallic lithium is present at the adhesive spots. The gray deposits located in the center of the electrode are featured in the second column. While no evidence of metallic lithium plating was detected in this area, it is highly probable that a reaction product of the electrolyte is present. This aligns with the findings observed in the ultrasound images.
