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.

电极材料具有微纳米尺寸的微观形态在改善可充电镁电池（RMB）的电化学性能方面起着重要作用。在此，通过简单的水热法合成具有三种可控形态的VS ₄作为RMB的高电化学性能正极材料。通过各种表征方法研究了形态对电化学性能的影响。经过400次循环后，与其他两个样品相比，花状VS ₄ 在50 mA g ^-1下显示出约80 mAh g ^-1的出色可逆容量，并具有更高的容量保持率（90％）。花状VS ₄的卓越电化学性能这归因于感兴趣的线性链结构和特殊的花状形态，提供了由许多纳米片相交，大的比表面积和更多的活性位点形成的大量空隙。此外，异位X射线衍射仪（XRD）和X射线光电子能谱（XPS）用于进一步研究花状VS ₄阴极的可逆放大/缩小功能。这项研究工作可能为构建低成本，高容量和良好循环稳定性的适用阴极材料铺平道路，以供人民币在大规模储能中的实际应用。