Redoxflow storage technologies soared over the past decades, but still remains limited by the solubility of redox species. A promising alternative could be the semi-solid redox flow batteries (SSRFB) that recently came out and which consists in using insertion material particles in suspension as storage vector [1]. Such a SSRFB leads theoretically to both higher efficiency and capacity, along with reduced species crossover. Nonetheless, it carries at least two challenges: studying the electrochemical behavior of dispersed nanoparticles and solving ion conductive membrane issues usually used for such systems.