Performance of fine structured aluminum anodes in neutral and alkaline electrolytes for Al-air batteries
Performance of fine structured aluminum anodes in neutral and alkaline electrolytes for Al-air batteries
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DOI：
10.1016/j.electacta.2015.03.002
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发表时间：
2015-05-20
影响因子：
6.6
通讯作者：
Leng, Jing
中科院分区：
文献类型：
--
作者：
Fan, Liang;Lu, Huimin;Leng, Jing
铝（Al）是金属-空气电池的创新阳极材料。但高腐蚀速率和大极化干扰了其商业应用。本文采用等通道转角挤压（ECAP）工艺在室温下制备了超细晶铝阳极。采用电化学阻抗谱（EIS）和动电位极化法研究了铝阳极在4 mol L-1 NaOH、KOH和2 mol L-1 NaCl溶液中的电化学性能。通过在参比电解质中以10 mA cm（-2）的恒定电流放电测试使用阳极的电池性能。实验结果表明，由于Al阳极的活性溶解，更细的晶粒尺寸增强了碱性电解质中的电池性能。但在NaCl电解液中，由于氧化膜的堵塞和局部腐蚀，晶粒细小的铝阳极不能发挥作用。这种阳极制造方法提供了一种用于改善碱性电解质中的Al-空气电池的性能的手段。(C)2015爱思唯尔有限公司版权所有。
Aluminum (Al) is an innovative anode material for metal-air batteries. But high corrosion rates and large polarization interfere with its commercial application. In the study reported in this paper, an ultrafine-grained (UFG) aluminum anode was prepared by equal channel angular pressing (ECAP) at room temperature. The electrochemical properties of the Al anode were investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization in 4 mol L-1 NaOH, KOH and 2 mol L-1 NaCl. Battery performance using the anodes was tested by constant current discharge at 10 mA cm(-2) in the referenced electrolytes. The experimental results showed that finer grain sizes enhance battery performance in alkaline electrolytes, due to active dissolution of the Al anode. But in the NaCl electrolyte, the fine grain size of the Al anode offers no performance due to the blockage of the oxide film and local corrosion. This anode fabrication approach provides a means for improving the performance Al-air battery in alkaline electrolytes. (C) 2015 Elsevier Ltd. All rights reserved.