Novel layered iron vanadate as a stable high-voltage cathode material for nonaqueous magnesium-ion batteries

Magnesium-ion batteries (MIBs) have been deemed as a promising alternative to lithium-ion batteries because they can employ a Mg metal anode, potentially yielding a higher energy density. However, the lack of cathode materials capable of the reversible Mg intercalation in non-aqueous electrolytes severely limits the commercialisation of MIBs. In this study, a novel cathode material, layered iron vanadate (FeV3O9 center dot 1.1H(2)O), is proposed for use in non-aqueous MIBs. At 20 mA g 1, FeV3O9 center dot 1.1H(2)O registered a high reversible capacity and average voltage of 149 mAh/g and 2.53 V (vs. Mg/Mg2+), respectively. It also demonstrated a stable cycle life with an 85% capacity retention even after 500 discharge-charge cycles. The reversibility of the Mg intercalation reaction on this novel iron vanadate-based host was confirmed through elemental analyses, X-ray diffraction (XRD), and high-resolution transmission electron microscopy (TEM). This study offers valuable insights that could facilitate the design and development of novel oxide-based materials as high-performance cathodes for non-aqueous MIBs.

Automated summary

In this study, a novel cathode material, layered iron vanadate, was proposed for use in non-aqueous magnesium-ion batteries (MIBs). The material exhibited high reversible capacity and average voltage, as well as stable cycle life. The reversibility of the magnesium intercalation reaction on the material was confirmed through experimental analysis. This study offers valuable insights for the design and development of high-performance cathodes for non-aqueous MIBs.