Large‐Scale Energy Storage: A Stable Vanadium Redox‐Flow Battery with High Energy Density for Large‐Scale Energy Storage (Adv. Energy Mater. 3/2011)

Though considered a promising large-scale storage device for regulating renewable energy supply during calm and cloudy weather, the vana-dium redox battery's use has been limited by its inability to work well in a wide range of temperatures and its low energy density. Adding hydro-chloric acid to the sulfuric acid electrolyte typically used in vanadium redox flow batteries increased the batteries' energy storage capacity by 70% and expanded the operational temperature range, report Liyu Li, Zhenguo Yang, and co-workers on p. 394.