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Mason, Chad W.
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document
Activating vanadium's highest oxidation state in the NASICON structure
Abstract
<p>The capacity and energy density of Na<sub>3</sub>V<sub>2</sub>(PO <sub>4</sub>)<sub>3</sub> cathode material, for sodium ion batteries, was enhanced by partial substitution of iron in the octahedral vanadium site. Through this process, we show for the first time that the V<sup>4+</sup>/V <sup>5+</sup> redox couple can be utilized in rhombohedral NASICON at above 4.0V vs. Na/Na<sup>+</sup>. At this juncture, we discovered that iron is unique in its ability to easily activate vanadium's highest oxidation state. Furthermore, an additional 12% capacity is realized due to the increased sodium concentration in the synthesized compound.</p>