Binary NaCl–NaF and NaCl–LiF Flux-Mediated Growth of Mixed-Valence (V3+/4+) NASICON-Type Na3V2(PO4)2F2.5O0.5 and Na2.4Li0.6V2(PO4)2F2.5O0.5 for Highly Reversible Na- and Li-Ion Storage

Development of robust electrode materials that can work for both Li- and Na-ion batteries received enormous interest in recent times. Especially, exploratory crystal growth offers much reward in re...