Vanadium redox flow batteries (VRB) are large stationary electricity storage systems with
many potential applications in a deregulated and decentralized network. Flow batteries (FB)
store chemical energy and generate electricity by a redox reaction between vanadium ions
dissolved in the electrolytes. FB are essentially comprised of two key elements (Fig. 1): the
cell stacks, where chemical energy is converted to electricity in a reversible process, and the
tanks of electrolytes where energy is stored.