Numerous efforts have been made to develop new thin films by using atmospheric pressure plasma process. Complex materials such as nanocomposite thin films [1.2], biodegradable coatings [3] and advanced chemical treatments on complex surfaces [4] have for example been studied.Recently, we reported the use of an atmospheric pressure dielectric barrier discharge (DBD) to strongly modify the interfacial properties in lithium-ion batteries [5]. This work focuses on the chemical functionalization of composite electrodes used for aqueous electrolyte rechargeable batteries (ARLB). In this presentation, the physicochemical properties of the coating and electrochemical performance of such electrodes are investigated.Plasma-deposited coatings were then characterized by SEM-EDX, FTIR and XPS. The electrical analysis indicates that the discharge remains stable during the process. This suggests that the substrate slightly affect the physical regime of the gaseous discharge. The SEM analysis of the plasma-treated electrode suggests a homogeneous surface treatment over a wide area. From the FTIR analysis, different chemical groups were highlighted.Finally, the electrochemical performance of such electrodes was also investigated in a battery operation. Preliminary explanation of the fundamental mechanisms allowing the operation of the battery and ions diffusion through the plasma layer is attempted.[1] J. Profili et al., Plasma Processes and Polymers, volume13, issue10, October 2016, 981-989[2] P. Brunet et al., Plasma Processes and Polymers, volume 14, issue12, December 2017, 1700049[3] M. Laurent et al., Plasma Processes and Polymers, volume 13, issue7, July 2016, 711-721[4] S. Asadollahi et al., Materials 2019, 12(2), 219[5] J. Profili et al., ACS Sustainable Chemistry & Engineering 8 (12), 4728-4733