Microwave-assisted smelting to improve the corrosion and discharge performance of Al-anodes in Al-air batteries

Aluminum anodes with fine grain have stronger electrochemical activity and higher corrosion resistance, but the microwave-smelted aluminum alloy anode can be prepared with fine grain. In this work, microwave smelting has been used to refine grain size and optimize the precipitated phase in an alumin...

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Bibliographic Details
Published in:Journal of materials science 2023-08, Vol.58 (30), p.12433-12449
Main Authors: Wei, Sikang, Han, Zhaohui, Xu, Yang, Xu, Lei
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Aluminum alloys
Aluminum base alloys
Anodes
Batteries
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
corrosion
Corrosion and anti-corrosives
Corrosion resistance
Crystallography and Scattering Methods
Electrochemical analysis
electrochemistry
energy density
Grain size
Materials Science
Metal air batteries
Metallurgy
Metals & Corrosion
microstructure
microwave treatment
Optimization
Polymer Sciences
Smelting
Solid Mechanics
Uniform attack (corrosion)
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Summary:Aluminum anodes with fine grain have stronger electrochemical activity and higher corrosion resistance, but the microwave-smelted aluminum alloy anode can be prepared with fine grain. In this work, microwave smelting has been used to refine grain size and optimize the precipitated phase in an aluminum alloy anode. The results show that microwave can not only refine the grain and improve the corrosion resistance of aluminum anode, but also the distribution of precipitated phase is more uniform. The fine grain reduces the potential difference inside the aluminum anode, thus activating the electrochemical activity of the anode and improving the corrosion resistance. The corrosion form is also changed from the conventional pit corrosion to uniform corrosion, so as to improve the utilization rate of anode. The capacity density and energy density of 1000 W microwave-smelted aluminum anode were 1554.404 mAh/g and 1955.181 Wh/kg, respectively. Compared with conventional aluminum anode, the energy density and capacity density increased by 92.7% and 64.5%, respectively. Therefore, microwave technology can improve electrochemical performance and battery performance by optimizing microstructure uniformity and refining grain size.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-023-08784-x