The role of hot extrusion in improving electrochemical properties of low-cost commercial Al alloy as anode for Al-air battery

IF 4.5 3区化学 Q1 Chemical Engineering

Journal of Electroanalytical Chemistry Pub Date : 2022-03-15 DOI:10.1016/j.jelechem.2022.116127

Mi Chen , Xiaobo Zheng , Zhiwei Liu , Qiaoling Zheng , Bohan Zheng

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Abstract

Hot extrusion (HE) was applied in the treatment of low-cost commercial Al6063 alloy containing impurity iron (Fe) element (0.12 wt%) with the aim of decreasing the self-corrosion and optimizing the discharge performance of Al6063 alloy as an anode for Al-air battery. Experimental results showed that HE effectively refined the α-Al grains as well as the coarse AlFeSi phase along the grain boundaries and further led to the intragranular distribution of AlFeSi phase. The electrochemical tests proved that the corrosion resistance of Al alloy after HE treatment was enhanced. Combined with the surface analysis of Al anode after discharge, the immersion test suggested that the corrosion pits were prone to occur near the AlFeSi phase rather than at the grain boundaries and the distribution of AlFeSi phase at grain boundaries could accelerate the corrosion process, indicating that the HE induced improvement in corrosion resistance of Al alloy was attributed to fragmentation of AlFeSi phase and its distribution within grains from grain boundaries. Furthermore, owing to the increased grain boundaries and delayed corrosion process, the average discharge potential of Al anode increased from 1.1737 V to 1.1914 V while the energy density as well as the anode efficiency of which were improved by 65.39% and 62.95%, respectively. This research provided an effective approach to the expansion usage of low-cost commercial Al alloys as the potential anode materials for Al-air batteries.

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热挤压在提高铝空气电池负极低成本商用铝合金电化学性能中的作用

采用热挤压法(HE)处理含杂质铁(Fe)元素(0.12 wt%)的低成本商用Al6063合金，以降低Al6063合金作为铝空气电池负极材料的自腐蚀并优化其放电性能。实验结果表明，HE有效地细化了α-Al晶粒和沿晶界粗大的AlFeSi相，进一步导致了AlFeSi相在晶内的分布。电化学试验证明，经HE处理后的铝合金的耐蚀性得到了提高。结合铝阳极放电后的表面分析，浸泡试验表明，腐蚀坑容易出现在AlFeSi相附近而不是晶界处，AlFeSi相在晶界处的分布可以加速腐蚀过程，说明HE诱导铝合金耐蚀性的提高是由于AlFeSi相的碎裂和晶界内分布所致。同时，由于晶界的增加和腐蚀过程的延缓，铝阳极的平均放电电位从1.1737 V提高到1.1914 V，能量密度和阳极效率分别提高了65.39%和62.95%。本研究为推广低成本铝合金作为铝空气电池负极材料提供了一条有效途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.