Magnesium batteries are recognized as a potential alternative to lithium ion batteries benefited from the advantages of low cost, high safety, and high energy density. But the development of magnesium batteries suffers from the sluggish motion of Mg²⁺ in solid electrodes due to strong polarization. Compounds explored to accommodate magnesiation/demagnesiation, suffer from low capacity, sluggish kinetics and poor cycling performance. In this manuscript, copper current collector aided tellurium (Te) as the cathode material of magnesium battery is proposed. Due to superior electronic structure of Te atom, both reactants and products of cathode reaction exhibit metallic conductivity which accelerates the magnesiation/demagnesiation process This material delivers a specific capacity of 338 mAh/g at 100 mA/g, and keeps at 178.5 mAh/g after 400 cycles. Moreover, the electrode performs superior rate capability than the previously reported materials. A specific capacity of 265.4 mAh/g is achieved at 2 A/g without obvious polarization. Even at a very high current density of 3.75 A/g, a specific capacity of 118 mAh/g is still maintained. This study highlights the importance of electronic structure for multi-valent ion reaction related material, which also offers new strategy for cathode design of Mg batteries.

镁电池由于其低成本，高安全性和高能量密度的优势而被认为是锂离子电池的潜在替代品。但是镁电池的发展受到Mg ²⁺的缓慢运动的影响在固体电极中由于强极化作用。为适应放大/缩小要求而开发的化合物具有容量低，动力学迟缓和循环性能差的缺点。在该手稿中，提出了铜集流体辅助碲（Te）作为镁电池的正极材料。由于Te原子具有优越的电子结构，因此反应物和阴极反应产物均显示出金属导电性，从而加速了镁/去镁过程。该材料在100 mA / g时的比容量为338 mAh / g，并保持在178.5 mAh / g经过400个周期。此外，该电极比以前报道的材料具有更高的倍率性能。在2 A / g下没有明显极化的情况下可实现265.4 mAh / g的比容量。即使在3.75 A / g的极高电流密度下，仍保持118 mAh / g的比容量。这项研究突出了电子结构对于与多价离子反应相关的材料的重要性，这也为镁电池的阴极设计提供了新的策略。