The electrochemical energy storage and conversion devices are the key components in future?s smart energy grids enabling on-demand and efficient energy usage. To date, flow, lithium-ion, Na-sulphur and Li-sulphur batteries have been considered as most promising energy storage devices. The electrochemical performance of the batteries, processes at the electrodes during the charging and discharging, depends strongly on the properties of the carbon material and electrolyte used. The scientific goal of this experiment is a profound understanding of intercalation/decalation transport processes in complex system, based on sodium containing electrolyte and electrode prepared from highly porous carbide derived carbon material. The outcome of the work is one of the important milestones to understand and interpret the dynamic changes during charging/discharging in batteries/in operando conditions.