A Vanadium Redox Flow Battery based on a highly concentrated Protic Ionic Liquid Electrolyte

LE STUDIUM Multidisciplinary Journal, 2021, 5, 1-5         

Georgios Nikiforidis1,2 and Mérièm Anouti1,2


1Laboratoire PCM2E, Université de Tours, Parc de Grandmont, 37200, Tours, France

2LE STUDIUM Institute for Advanced Studies, 45000 Orléans, France


A protic ionic liquid is inctroduced for the first time as a solvent for a high energy density vanadium redox flow battery.  The proof-of-concept redox flow cell with a concentration of 3 mol L−1 vandyl sulfate electrolyte was tested for a total of 30 cycles at 40°C, showing an open circuit potential of 1.38 V, a nominal capacity of 1900 mAh at a current density of 40 mA cm−1 and energy and coulombic efficiencies of 64 and 90%, respectively. The continuous 16 hours of cycling suggest that the concentrated anolyte and catholyte are thermally stable and cycleable. This study underlines a new route to improve the energy-to-volume ratio of this promising energy storage system.



Protic ionic liquids
Redox Flow Battery
High energy density
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Le STUDIUM Multidisciplinary Journal