The exploration of cathode materials with high energy density has been considered as one key for the development of magnesium batteries. The high magnesium storage capacity of CuS has been demonstrated at high temperature (over 100 °C), but its electrochemical performance at lower temperature still needed to be improved largely. Herein, we realize the high magnesium storage activity (over 300 mAh g⁻¹) of CuS cathode at room temperature via adjusting electrode-electrolyte interface. In the full magnesium battery, CuS cathode achieves a high capacity of 119 mAh g⁻¹ after 30 cycles at 50 mA g⁻¹. Besides, the conversion-type storage mechanism has been certified via ex-situ XRD and so on. This work demonstrated CuS is a promising cathode material for magnesium battery.

具有高能量密度的阴极材料的探索已被认为是镁电池发展的关键之一。已经证明了在高温（超过100°C）下CuS的高镁储存能力，但是在低温下的电化学性能仍需要大大提高。在此，我们通过调节电极-电解质界面实现了室温下CuS阴极的高镁储存活性（超过300 mAh g ^-1）。在全镁电池中，CuS阴极在50 mA g ^-1下经过30次循环后可实现119 mAh g ^-1的高容量。此外，转换型存储机制已通过异地认证XRD等。这项工作表明，CuS是一种有前途的镁电池正极材料。