低合金化Mg-Ag镁空气电池阳极材料的电化学行为和放电性能
收稿日期: 2023-08-10
修回日期: 2024-01-02
网络出版日期: 2024-01-18
基金资助
国家自然科学基金项目(52375370);山西省自然科学基金项目(202103021224049);山西浙大新材料与化工研究院技术开发项目(2022SX-TD025);青海大学盐湖化工大型系列研究设施开放研究项目(2023-DXSSKF-Z02)
Electrochemical Behavior and Discharge Performance of a Low-Alloyed Mg-Ag Alloy as Anode for Mg-Air Battery
Received date: 2023-08-10
Revised date: 2024-01-02
Online published: 2024-01-18
Supported by
National Natural Science Foundation of China(52375370);Natural Science Foundation of Shanxi Province(202103021224049);Shanxi Zhejiang University New Materials and Chemical Research Institute Scientific Research Project(2022SX-TD025);Open Project of Salt Lake Chemical Engineering Research Complex, Qinghai University(2023-DXSSKF-Z02)
镁空气电池具有高的理论放电电压(3.1 V)和比能量密度(6.8 kWh/kg)，且结构简单、成本低廉、安全性高，是理想的储能设备。然而，目前镁空气电池能够实现的放电电压和能量密度远低于理论值。为了协同提升镁空气电池的放电电压和比能量密度，本工作开发了低合金化Mg-1Ag (质量分数，%)阳极材料并研究了其微观组织、电化学行为和放电性能。结果表明，挤压态合金主要由均匀的等轴晶组成，平均晶粒尺寸为(14.19 ± 2.27) μm，展现出基极垂直于横向的织构，织构强度为11.05，Ag元素存在局部偏聚。以Mg-1Ag阳极组装的镁空气电池，在10 mA/cm2的电流密度下放电过程平稳，电池电压和比能量密度分别为1.344 V和1374.34 mWh/g。镁空气电池优异的放电性能主要与金属Ag在电极表面的再沉积、多裂纹的放电产物膜和较高体积分数的非基面取向晶粒有关。
郝旭邦 , 程伟丽 , 李戬 , 王利飞 , 崔泽琴 , 闫国庆 , 翟凯 , 余晖 . 低合金化Mg-Ag镁空气电池阳极材料的电化学行为和放电性能[J]. 金属学报, 2025 , 61(6) : 837 -847 . DOI: 10.11900/0412.1961.2023.00332
Primary Mg-air batteries have attracted considerable attention in the field of standby emergency energy storage in the wilderness because of their high theoretical voltage (3.1 V) and appreciable specific energy (6.8 kWh/kg). However, because of the severe self-corrosion and sluggish anodic kinetics of Mg anodes, the actual performance of Mg-air batteries is far from the theoretical limits. To synergistically enhance the discharge voltage and specific energy of Mg-air batteries, a low-alloyed Mg-1Ag (mass fraction, %) anode was developed, and its microstructure, electrochemical behavior, and discharge properties were evaluated. The results showed that the extruded alloy mainly consisted of equiaxed grains with an average grain size of (14.19 ± 2.27) μm. The anode studied exhibited a typical extrusion texture with a basal pole perpendicular to the transverse direction, and the texture intensity was 11.05. Additionally, the extruded alloy was shown to exhibit localized segregation of Ag. The Mg-air battery based on the Mg-1Ag alloy as the anode exhibited a stable discharge process. In addition, the cell voltage and specific energy reached 1.344 V and 1374.34 mWh/g at 10 mA/cm2, respectively. The acceptable discharge performance of the anode was mainly due to the redeposition of metal Ag on the electrode surface, the multi-cracked discharge product film, and the non-basal-oriented grains with a high-volume fraction.
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