Aqueous rechargeable magnesium-ion batteries with low cost of magnesium resources have a potential to meet growing requirements for electric energy storage resulted from the similar electrochemical properties to lithium. The Mg_1.1Mn₆O₁₂·4.5H₂O named as magnesium octahedral molecular sieves (Mg-OMS-1) owns nanobelt structures as a cathode material for aqueous magnesium-ion battery. The morphology and structure of Mg-OMS-1 are measured by X-ray diffraction, scanning and transmission electron microscopy. The mechanism of magnesium-ion insertion/deinsertion from this host material and the theory specific capacity of Mg-OMS-1 are determined by cyclic voltammetry, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. Mg-OMS-1 displays an excellent battery behavior for Mg²⁺ insertion and deinsertion in the magnesium-salt aqueous electrolyte. The initial discharge capacity of Mg-OMS-1 electrode can reach 248.8 ± 0.5 mAh g⁻¹ at 10 mA g⁻¹ in the 0.2 mol dm⁻³ Mg(NO₃)₂ aqueous electrolyte. Even back to 10 mA g⁻¹ after the rate performance, the discharge capacity can achieve 214.1 ± 0.5 mAh g⁻¹. The specific capacity retention rate is 90.4% after cycling 200 times at 100 mA g⁻¹ in the 0.5 mol dm⁻³ Mg(NO₃)₂ electrolyte with a columbic efficiency of 99.7 ± 0.1% in the 5 times experiments.

中文翻译：

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纳米带结构的Mg1.1Mn6O12·4.5H2O的制备及其在水性镁离子电池中的应用

镁资源成本低的含水可再充电镁离子电池具有满足与锂相似的电化学性质所导致的对电能存储的不断增长的需求的潜力。Mg _1.1 Mn ₆ O ₁₂ ·4.5H ₂被称为镁八面体分子筛（Mg-OMS-1）的O具有纳米带结构，作为水性镁离子电池的正极材料。通过X射线衍射，扫描和透射电子显微镜测量Mg-OMS-1的形态和结构。通过循环伏安法，电化学阻抗谱和X射线光电子能谱确定了镁离子从该主体材料中插入/插入的机理以及Mg-OMS-1的理论比容量。Mg-OMS-1对镁盐水溶液中的Mg ²⁺插入和去插入显示出出色的电池性能。Mg-OMS-1电极的初始放电容量在0.2 dM ^-3的10 mA g ^-1时可达到248.8±0.5 mAh g ^-1Mg（NO ₃）₂水性电解质。倍率性能后甚至恢复到10 mA g ^-1，放电容量也可以达到214.1±0.5 mAh g ^-1。在5倍实验中，在0.5 mol dm ^-3 Mg（NO ₃）₂电解质中以100 mA g ^-1循环200次后，比容量保持率为90.4 ％，在5次实验中，其库仑效率为99.7±0.1％。