**5. Outlook**

The results showed that the electrochemical performance of the electrodes, or the cells, was essentially a ffected by contamination products and less by the chamfer width or heat-a ffected zone investigated in this study. Based on this knowledge, it is imperative to find out which contaminations and concentrations are to be considered critical with regard to the electrochemical performance. Furthermore, the pulsed ns laser system should be used to investigate which parameters lead to which contaminations and whether the cw laser system o ffers process-inherent advantages with regard to the contamination of the electrode surface. On the basis of these further investigations, unknown new laser systems could be designed process-safe to fulfill the minimum requirement of four Sigma rejects.

**Author Contributions:** T.J. and M.W.K. wrote and edited the main parts of the paper, S.H. analyzed the REM/EDX data. L.H. analyzed the electrochemical data. W.H. analyzed the electrochemical data and administered the funding acquisition. K.D. administered the research project. All authors contributed to scientific discussions.

**Funding:** The results were generated in the project DaLion (03ET6089) funded by the Federal Ministry of Economic Affairs and Energy. The authors express their gratitude for the financial support by the Ministry and for the project managemen<sup>t</sup> by the ProjektträgerJülich.

**Acknowledgments:** Hereby I would like to thank my student assistant Julien Essers for his technical support.

**Conflicts of Interest:** The authors declare no conflict of interest.
