Abstract
The micro-morphology with micro-nano size of the electrode materials plays a significant role in improving the electrochemical performance of rechargeable magnesium battery (RMB). Herein, VS4 with three controllable morphologies is synthesized via a simple hydrothermal method as high electrochemical performance cathode material for RMB. The effect of the morphology on the electrochemical performance is studied via various characterization methods. After 400 cycles, the flower-like VS4 shows excellent reversible capacity about 80 mAh g−1 at 50 mA g−1 with higher capacity retention (90%) compared to other two samples. The remarkable electrochemical performance of flower-like VS4 is attributed to the interested linear-chain structure and the special flower-like morphology providing a large amount of interspace formed by the intersection of many nanosheets, large specific surface area and more active sites. Moreover, ex situ X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) are used to further investigate the reversible magnesiation/demagnesiation mechanism of the flower-like VS4 cathode. This research work may pave the way for constructing the applicable cathode materials with low-cost, higher capacity and good cyclic stability for the practical application of RMB in large-scale energy storage.
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