​Vanadium redox flow battery is a secondary battery with vanadium ion solution as positive and negative active materials.

The vanadium redox battery offers a relatively high cell voltage, which is favorable for higher power and energy density compared with other true RFBs, like the iron-chromium system.

The Vanadium Redox Battery (VRB®)¹ is a true redox flow battery (RFB), which stores energy by employing vanadium redox couples (V2+/V3+ in the negative and V4+/V5+ in the positive half-cells).

The history of vanadium battery.

The vanadium electrolyte is the core of the "all-vanadium redox flow battery​ light storage and utilization integration project". As a metal "vitamin", vanadium is widely used in new materials in the fields of automobiles, aviation, railways, electronic technology, and national defense.

Current large-scale applications of vanadium redox flow batteries.

In the all-vanadium redox flow battery system, vanadyl sulfate in sulfuric acid solution acts as the initial electrolyte on both sides. The same elements in different oxidation states can be interconverted at the electrodes. Figure 4 shows the basic schematic of the VRFB.

Advantages of all vanadium flow batteries: Wide range of applications.It can be used in wind power generation market, national grid peak regulation, new energy electric vehicle power supply, UPS power supply and EpS emergency power supply, power distribution, special batteries, photovoltaic power generation.