Ruthenium‐Oxide‐Coated Sodium Vanadium Fluorophosphate Nanowires as High‐Power Cathode Materials for Sodium‐Ion Batteries.

RuO2-coated Na3V2O2(PO4)2F nanowires are prepared by hydrothermal reaction of a microemulsion formed by combining an aqueous solution of oxalic acid, NaF, NH4H2PO4, and NH4VO3 with a mixture of cetyltrimethylammonium bromide, H2O, cyclohexanone, and n-pentanol (autoclave, pH 2-3 adjusted with HNO3, 180 °C, 24 h).