H₂V₃O₈ Nanowires as High-Capacity Cathode Materials for Magnesium-Based Battery

Magnesium-based batteries have received much attention as promising candidates to next-generation batteries because of high volumetric capacity, low price, and dendrite-free property of Mg metal. Herein, we reported H 2 V 3 O 8 nanowire cathode with excellent electrochemical property in magnesium-based batteries. First, it shows a satisfactory magnesium storage ability with 304.2 mA h g –1 capacity at 50 mA g –1 . Second, it possesses a high-voltage platform of ∼2.0 V vs Mg/Mg 2+ . Furthermore, when evaluated as a cathode material for magnesium-based hybrid Mg 2+ /Li + battery, it exhibits a high specific capacity of 305.4 mA h g –1 at 25 mA g –1 and can be performed in a wide working temperature range (−20 to 55 °C). Notably, the insertion-type ion storage mechanism of H 2 V 3 O 8 nanowires in hybrid Mg 2+ /Li + batteries are investigated by ex situ X-ray diffraction and Fourier transform infrared. This research demonstrates that the H 2 V 3 O 8 nanowire cathode is a potential candidate for high-performance magnesium-based batteries.