Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland 1142, New Zealand.
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China.
ACS Appl Mater Interfaces. 2023 Jul 12;15(27):33065-33076. doi: 10.1021/acsami.3c03591. Epub 2023 Jun 27.
Magnesium rechargeable batteries (MRBs) are presently attracting much attention due to their low cost, high safety, and high theoretical volumetric capacity. Traditionally, pure magnesium metal has been used as an anode for MRBs, but its poor cycle performance, modest compatibility with conventional electrolytes, and sluggish kinetics limit the further development of MRBs. In this work, eutectic and hypereutectic Mg-Sn alloys were designed and studied as anodes for MRBs. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results confirmed that these alloys contained unique microstructures consisting of α-Mg, MgSn, and eutectic phases. The dissolution processes of the Mg-Sn alloys were studied in an all-phenyl-complex (APC) electrolyte. A multiple-step electrochemical dissolution process and a special adsorption interface layer were established for the Mg-Sn alloy anodes with an eutectic phase. Hypereutectic alloys with mixed phases showed better battery performance than the eutectic alloy owing to their superior mechanical properties. In addition, the morphology and Mg dissolution mechanism of the Mg-Sn alloys during the 1 dissolution process were characterized and discussed.
镁可充电池（MRB）由于其低成本、高安全性和高理论体积容量而备受关注。传统上，纯镁金属被用作 MRB 的阳极，但它较差的循环性能、与传统电解质的适度兼容性和缓慢的动力学限制了 MRB 的进一步发展。在这项工作中，设计并研究了共晶和过共晶 Mg-Sn 合金作为 MRB 的阳极。扫描电子显微镜（SEM）和透射电子显微镜（TEM）结果证实，这些合金包含独特的微观结构，由α-Mg、MgSn 和共晶相组成。研究了 Mg-Sn 合金在全苯基络合物（APC）电解质中的溶解过程。建立了具有共晶相的 Mg-Sn 合金阳极的多步电化学溶解过程和特殊的吸附界面层。具有混合相的过共晶合金表现出比共晶合金更好的电池性能，这归因于其优异的机械性能。此外，还对 Mg-Sn 合金在 1 溶解过程中的形态和 Mg 溶解机制进行了表征和讨论。
