Impact of the F<sup>–</sup> for O<sup>2–</sup> Substitution in Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>F<sub>3–<i>y</i></sub>O<sub><i>y</i></sub> on Their Transport Properties and Electrochemical Performance
ACS applied energy materials