Hexagonal Na3Zr2PO4(SiO4)2 is a well-known fast Na+ conductor commonly referred to as NASICON. The low cost and wide availability of sodium invites exploration of Na+-insertion cathodes with the hexagonal NASICON framework structure. Here we report a low-temperature synthesis of NaFe2PO4(SO4)2 with the same host framework as NASICON and its performance as the cathode of a Na/Na1+xFe2PO4(SO4)2 cell operating on the Fe3+/Fe2+ redox couple. The cell provides a single-phase reaction having a capacity approaching 100 mA h g−1 at 0.1C after 50 cycles over the voltage range 2 ≤ V ≤ 4 V with a coulomb efficiency approaching 100%. An increase in capacity with cycling is the result of aging of an unoptimized electrode morphology.
No takes yet. Share an insight, caveat, or question.
Shiva et al. (2016) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: