Abstract
High energy‐density, redox flow batteries (RFB) can provide cost‐effective, grid‐scale energy storage, facilitating the use of intermittent sources such as solar and wind power. A new electrolyte based on vanadium and redox‐active ligands that stores equivalents of charge separately from the metal center is presented. Electrolytes composed of non‐innocent ligands greatly enhance both the energy density and stability of non‐aqueous RFBs