高性能高功率水性镁空气电池用镁-稀土金属间化合物

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2024-10-01 DOI:10.1016/j.jma.2023.06.010

Bingjie Ma , Liuzhang Ouyang , Jie Zheng

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引用次数: 0

摘要

镁合金是一种轻型结构材料，也是镁空气电池的理想阳极候选材料。然而，镁空气电池在大电流密度和严重的 H2 生成副反应下性能不佳，限制了其应用。在这项研究中，我们率先将镁稀土 Mg3RE（RE=La、Ce、Pr 和 Nd）金属间化合物作为阳极，以提供更高的功率密度和更稳定的放电性能。尤其是 Mg3Pr 合金，其放电电压高达 0.91 V，在 60 mA cm-2 电流条件下的峰值功率密度为 54.4 mW cm-2，阳极效率为 60%，远远优于其他镁合金。我们揭示了基于 Mg3RE 的阳极在放电过程中的活化机制，该机制显著加速了传质过程并提高了放电活性。这些成果提高了高功率镁空气电池的性能，促进了丰富稀土元素（如铈和镧）的增值应用。

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Magnesium-rare earth intermetallic compounds for high performance high power aqueous Magnesium-Air batteries

Magnesium alloys are light structural materials and promising anode candidates for Mg-air batteries. However, application of Mg-air batteries is limited by poor performance at large current density and severe H₂ generation side reactions. In this study, we pioneered magnesium-rare earth Mg₃RE (RE=La, Ce, Pr and Nd) intermetallic compounds as anodes to provide higher power density and more stable discharge performance. Especially, Mg₃Pr alloy exhibits high discharge voltage of 0.91 V and peak power density of 54.4 mW cm⁻² at 60 mA cm⁻² with anodic efficiency of 60%, far better than other Mg alloys. We reveal an activation mechanism of Mg₃RE-based anodes during discharge, which significantly accelerates mass transfer process as well as enhances discharge activity. The results improve the performance of high-power Mg-air batteries and promote the value-added application of abundant rare earth elements such as Ce and La.

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.