**Conflict of interest**

The authors are part of the company Eisenhuth GmbH & Co. KG, which produces bipolar plates made of graphitic compounds and gaskets for fuel cell, redoxflow battery and heat exchanger purposes.

The shown data are part of the acknowledged public funded projects. The conclusions and statements made are based on the experience of the authors in their specific working fields in the said company.

*Energy Storage Battery Systems - Fundamentals and Applications*
