Rechargeable magnesium batteries (RMBs) have garnered significant attention due to the abundant natural availability, safety and high volumetric capacity of magnesium (Mg) anode. However, the practical application has been hindered by the pronounced passivation layer and sluggish charge transfer kinetics of Mg anode in commercial conventional electrolytes. Herein, a superb Mg-conducting and electron-blocking interphase is constructed on Mg anode facilely through the spontaneous magnetization reaction with SbBr added in cost-effective Mg(TFSI) electrolyte. The interphase with high ionic conductivity and electronic resistivity endows Mg anode a stable long-cycling lifespan of 1600 h with a low overpotential (<0.3 V) at 0.5 mA cm and 0.5 mAh cm. Benefitting from the deep cycling Mg anode, the Mg||CuS cell delivers an impressive specific capacity 85.2 mAh g over 300 cycles at 1000 mA g with a capacity retention of 82.8 %, as well as the Mg||MoS cell can be cycled over 500 cycles at 2C. This research provides valuable insight into the interphase construction and presents a feasible way to develop reliable Mg metal anode for high-performance RMBs.

中文翻译：

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由坚固的 Mg2+ 导电和电子绝缘界面实现的深循环镁金属阳极

由于镁（Mg）阳极的丰富的天然可用性、安全性和高体积容量，可充电镁电池（RMB）引起了极大的关注。然而，商业常规电解液中镁阳极明显的钝化层和缓慢的电荷转移动力学阻碍了其实际应用。在此，通过在经济高效的 Mg(TFSI) 电解质中添加 SbBr 的自发磁化反应，可以在 Mg 阳极上轻松构建出优异的 Mg 导电和电子阻挡界面。具有高离子电导率和电阻率的界面赋予镁阳极稳定的1600小时的长循环寿命，并且在0.5 mA cm和0.5 mAh cm时具有低过电位（<0.3 V）。受益于深度循环镁阳极，Mg||CuS电池在1000 mA g-1下循环300次后可提供令人印象深刻的比容量85.2 mAh g，容量保持率为82.8%，并且Mg||MoS电池可以循环使用2C 下 500 次循环。这项研究为界面结构提供了宝贵的见解，并提出了开发高性能人民币的可靠镁金属阳极的可行方法。