Unveiling the Magnesium Storage Mechanisms of Co-Sputtered Indium-Tin Alloy Films Using Operando X-ray Diffraction
Unveiling the Magnesium Storage Mechanisms of Co-Sputtered Indium-Tin Alloy Films Using Operando X-ray Diffraction
复制标题
利用原位 X 射线衍射揭示共溅射铟锡合金薄膜的镁存储机制
DOI：
10.1149/1945-7111/ac436e
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发表时间：
2022
影响因子：
3.9
通讯作者：
Zhonghua Zhang
中科院分区：
文献类型：
--
作者：
Wenrun Cui;Meijia Song;Guixing Jia;Yu Wang;Wanfeng Yang;Qingguo Bai;Zhonghua Zhang
锡（Sn）基负极由于其低反应电位、高理论容量以及与传统电解质的兼容性而引起了镁离子电池（MIB）的广泛关注。然而，它们较差的电化学反应性、缓慢的动力学和大的体积变化阻碍了进展。此外，对镁存储化学的清晰了解对于高性能 MIB 的开发至关重要。在这里，我们通过一步磁控共溅射制备了具有不同成分和相结构的自支撑In-Sn合金薄膜。以纯Sn薄膜为基准，单相和双相In-Sn合金薄膜有效地引发了Sn与Mg的合金化反应，并且In的进一步增加显着提高了In-Sn电极的电化学反应活性。更重要的是，通过原位X射线衍射揭示了In0.2Sn0.8、In0.2Sn0.8/In3Sn和In3Sn电极的充镁/退镁机制，表明In0.2Sn0.8和In3Sn在单独存在或双相共存时表现出不同的镁储存机制。我们的研究结果强调了 MIB 电极设计和机制研究的重要性。
Tin (Sn)-based anodes have drawn extensive attention for magnesium ion batteries (MIBs) owing to their low reaction potentials, high theoretical capacities, and compatibility with conventional electrolytes. However, their poor electrochemical reactivity, sluggish kinetics, and large volume changes have obstructed progresses. Additionally, a clear understanding of the Mg storage chemistry is crucial for the development of high-performance MIBs. Here, we prepared self-supporting In-Sn alloy films with different compositions and phase constitutions via a one-step magnetron co-sputtering. As benchmarked with pure Sn film, the single-phase and biphase In-Sn alloy films effectively trigger the alloying reaction of Sn with Mg and further increasing of In significantly improves the electrochemical reactivity of the In-Sn electrodes. More importantly, operando X-ray diffraction was performed to unveil the magnesiation/demagnesiation mechanisms of the In0.2Sn0.8, In0.2Sn0.8/In3Sn and In3Sn electrodes, showing that In0.2Sn0.8 and In3Sn display different Mg storage mechanisms when existing alone or biphase coexisting. Our findings highlight the significance of the electrode design and mechanism investigations for MIBs.