The giant wheel-shaped Na15{[Mo154O462H14(H2O)70]0.5[Mo152O457H14(H2O)68]0.5}·ca. 400 H2O (Mo154) is one of the fascinating clusters with the open host framework, which is designed by simple metal-oxygen fragment–linked coordination modes. The generation of structural vacancies (here referred to as defects), the substitution of ligands, and incorporation of heterometallic centers in Mo154 could offer several attractive possibilities to achieve good electrochemical performance such as high specific capacity and stability in multivalent batteries. Herein, we have introduced electronically rich giant nanowheel Mo154 as a potential cathode material in magnesium-rechargeable batteries (MRBs). The experimental evidence indicates that the Mo154 wheels offer a reversible capacity of ∼150 mAh g−1 at 50 mA g−1 in MRBs, which was retained to about 55 mAh g−1 after a long cycling life (>500 cycles). Typically, the divalent alkali metals (Mg2+) suffer from diffusion and insertion reactions in host materials; however, the stable and high rate performance against cycling with good Coulombic efficiency was achieved for Mo154 electrodes. Thus, the work demonstrates that the complex inorganic clusters are promising cathode materials in multivalent ion batteries.

中文翻译：

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发现用于镁离子电池的巨型纳米轮

巨轮状Na15{[Mo154O462H14(H2O)70]0.5[Mo152O457H14(H2O)68]0.5}·ca。400 H2O (Mo154) 是具有开放宿主框架的迷人簇之一，它是由简单的金属-氧碎片连接的配位模式设计的。结构空位（此处称为缺陷）的产生、配体的取代以及在 Mo154 中引入异金属中心可以提供多种有吸引力的可能性，以实现良好的电化学性能，例如多价电池的高比容量和稳定性。在此，我们引入了富含电子的巨型纳米轮 Mo154 作为镁可充电电池 (MRB) 中的潜在阴极材料。实验证据表明，Mo154 轮在 MRB 中在 50 mA g-1 下提供~150 mAh g-1 的可逆容量，在长循环寿命（> 500 次循环）后保持在约 55 mAh g-1。通常，二价碱金属 (Mg2+) 在主体材料中会发生扩散和插入反应；然而，Mo154 电极实现了稳定和高倍率的循环性能和良好的库仑效率。因此，这项工作表明，复合无机簇是多价离子电池中很有前途的正极材料。