Electrode Performance of Sulfur-Doped Vanadium Pentoxide Gel Prepared by Microwave Irradiation for Rechargeable Magnesium Batteries

摘要

Rechargeable magnesium batteries have attracted attention for use in the next-generation power storage applications. V205 xerogel, which has a high capacity, is expected to be an active cathode material for magnesium rechargeable batteries. However, it faces the problem of degradation due to desorption of structural water. A vanadium pentoxide xerogel containing sulfur (S-V_2O_5 gel) was prepared by a new composition process and evaluated by structural analysis, and its electrode performance was analyzed. Structural analysis by X-ray diffraction, differential thermal analysis, and scanning electron microscopy showed that the bulk S-V205 gel adopted a V_2O_5 xerogel-like structure with a layer structure in a stable planar direction with added sulfur, and that the surface was a reformed hard,amorphous structure due to treatment with a low-temperature plasma generated using carbon felt (CF-MWP). Charge-discharge tests revealed a specific capacity of 450 mAh g~(-1), and cyclic voltammetry was almost perfectly stabilized after the second cycle.