<P> The Vanadium redox battery, a type of flow battery, is an electrochemical cell consisting of aqueous vanadium ions in different oxidation states . Batteries of the type were first proposed in the 1930s and developed commercially from the 1980s onwards . Cells use + 5 and + 2 formal oxidization state ions, and (as of 2016) are used commercially for small scale (c. 0.1 - 10 MW, 0.1 - 100 GJ) grid energy storage . </P> <P> Vanadate can be used for protecting steel against rust and corrosion by conversion coating . </P> <P> Lithium vanadium oxide has been proposed for use as a high energy density anode for lithium ion batteries, at 745 Wh / L when paired with a lithium cobalt oxide cathode . Vanadium phosphates have been proposed as the cathode in the Lithium Vanadium Phosphate Battery, another type of lithium ion battery . </P> <P> Health benefits of vanadium and its potential as an anticancer agent have been reviewed . Vanadium is more important in marine environments than terrestrial . </P>

Who discovered vanadium and what is it used for