Liu Hongxuan, Zhang Tingan, Xu Jingzhong
Key Laboratory of Ecological Metallurgy of Multimetal Intergrown Ores of Ministry of Education, School of Metallurgy, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2024 Aug 23;17(17):4179. doi: 10.3390/ma17174179.
In this work, the electrochemical and discharge properties of Mg-Zn-Sr ( = 0, 0.2, 0.5, 1, 2, and 4 wt.%) alloys used as anodes for Mg-air batteries were systematically studied via microstructure characterization, electrochemical techniques, and Mg-air battery test methods. The addition of Sr refines the grain size, changes the composition and morphology of the passivation film and discharge products, and enhances the electrochemical properties of the alloy. Excessive Sr addition breaks the grain boundaries and precipitates a large number of Sr-rich phases, resulting in microgalvanic corrosion and the 'chunk effect'. The anode efficiency of Mg-Zn-1Sr is the highest at a current density of 10 mA cm, reaching 61.86%, and the energy density is 2019 mW h g. Therefore, Sr is a microalloying element that can optimize the electrochemical performance of Mg-air battery alloy anodes.
在本工作中，通过微观结构表征、电化学技术和镁空气电池测试方法，系统研究了用作镁空气电池阳极的Mg-Zn-Sr（=0、0.2、0.5、1、2和4 wt.%）合金的电化学和放电性能。Sr的添加细化了晶粒尺寸，改变了钝化膜和放电产物的组成及形态，并增强了合金的电化学性能。过量添加Sr会破坏晶界并析出大量富Sr相，导致微电池腐蚀和“块状效应”。Mg-Zn-1Sr在电流密度为10 mA cm时阳极效率最高，达到61.86%，能量密度为2019 mW h g。因此，Sr是一种可优化镁空气电池合金阳极电化学性能的微合金化元素。
