Effect of Lamellae Modification in Eutectic Al_82.70Cu_17.30 Alloy on its Electrochemical Performance as Anode Using Symmetric Cell Electrochemical Impedance Spectroscopy

Abstract:

The purpose of this research is investigating the effect of eutectic lamellae modification through heat-treatments on the electrochemical performance of Eutectic aluminum-copper (E-Al_82.70Cu_17.30 at%) alloy. The alloy works as anode in less expensive aluminum chloride (AlCl₃) aqueous electrolyte using Symmetric Cell Electrochemical Impedance Spectroscopy (SCEIS). The alloy was produced using an arc furnace followed by heat-treatments at different conditions. X-ray diffraction (XRD), optical microscope (OM), were used to characterize the alloys followed by SCEIS testing. The as-cast E-Al_82.70Cu_17.30 showed some inhomogeneities in the lamellae microstructure, while heat-treating the as-cast E-Al_82.70Cu_17.30 produced homogenized sponge-like eutectic microstructure. Two heat-treatment conditions were employed, that is 1. Heating the as cast alloy at 535 °C and soaking for one hour, and 2. Heating at 535 °C and soaking for five hours. Electrochemical Impedance spectroscopy measurements were performed on these three (3) samples. The Nyquist plot of as-cast E-Al_82.70Cu_17.30, 1 and 5 hours annealling heat-treated (1HT and 5HT respectively) displayed characteristic diameters in high, medium, and also low frequency range. After fitting using complex non-linear least squares method, 1HT condition has bulk resistance (R_I) and charge transfer resistance (R_CT) of ~9 Ω and ~566 Ω respectively, as compared to As-cast condition, which has R_I of ~ 14 Ω and R_CT of ~ 695 Ω, whiles 5HT condition has R_I of ~26 Ω and R_CT of ~724 Ω.

• Periodical: Materials Science Forum (Volume 1154)
• Pages: 51-56
• DOI: https://doi.org/10.4028/p-m1UtBN
• Online since: June 2025
• Authors: Naziru M. Haruna*, Gehad G. Mohamed, Mohamed Abdel Hady Gepreel
• Keywords: Al_82.70Cu_17.30, AlCl₃ Electrolyte, Aluminum Ion Battery, Eutectic Structure, Symmetric Cell Electrochemical Impedance Spectroscopy

References

[1] Y.Tian, G. Zeng, A. Ruut, T. Shi, H. Kim, J. Wang, J. Koettgen, Y. Sun, B. Ouyang, T. Chen, Z. Lun, Z. Rong, K. Persson, G. Ceder. Promises and Challenges of Next-Generation 'beyond Li-ion' Batteries for Electric Vehicles and Grid Decarbonization, Chem. Rev., 121(3), 1623–1669, 2021.

DOI: 10.1021/acs.chemrev.0c00767

[2] Elia, G. Antonio, K. Marquardt, K. Hoeppner, S. Fantini, R. Lin, E. Knipping, W. Peters, J‐F. Drillet, S. Passerini, R. Hahn. An overview and future perspectives of aluminum batteries. Advanced Materials 28, 35 (2016): 7564-7579.

DOI: 10.1002/adma.201601357

[3] Z. Qing, M.J. Zachman, W.I.A. Sadat, J. Zheng, L.F. Kourkoutis, L. Archer. Solid electrolyte interphases for high-energy aqueous aluminum electrochemical cells. Science advances 4, 11 (2018): eaau8131.

DOI: 10.1126/sciadv.aau8131

[4] Z. Pan, X. Liu, J. Yang, X. Li, Z. Liu, X.J. Loh, J. Wang. Aqueous Rechargeable Multivalent Metal-Ion Batteries: Advances and Challenges, Adv. Energy Mater., 1–24, 2021.

DOI: 10.1002/aenm.202100608

[5] S.M.A. Nayem, S. Islam, M. Mohamed, S. Shaheen Shah, A.J.S. Ahammad, and M. A. Aziz, A Mechanistic Overview of the Current Status and Future Challenges of Aluminum Anode and Electrolyte in Aluminum-Air Batteries, Chem. Rec., vol. 24, no. 1, 2024.

DOI: 10.1002/tcr.202300005

[6] M. Jiang, C. Fu, P. Meng, J. Ren, J. Wang, J. Bu, A. Dong, J. Zhang, W. Xiao, B. Sun, Challenges and Strategies of Low-Cost Aluminum Anodes for High-Performance Al-Based Batteries, Adv. Mater., 1–27, 2022.

DOI: 10.1002/adma.202102026

[7] Q. Ran, H. Shi, h. Meng, S-P. Zeng, W-B. Wan, W. Zhang, Z. Wen, X.-Y. Lang, Q. Jiang Aluminum-copper alloy anode materials for high-energy aqueous aluminum batteries, Nat. Commun., 1–9, 2022.

DOI: 10.1038/s41467-022-28238-3

[8] Q. Ran, S-P. Zeng, M-H. Zhu, W-B. Wan, H. Meng, H. Shi, Z. Wen, X-Y. Lang, Q. Jiang Uniformly MXene-Grafted Eutectic Aluminum-Cerium Alloys as Flexible and Reversible Anode Materials for Rechargeable Aluminum-Ion Battery, Adv. Funct. Mater., 2023.

DOI: 10.1002/adfm.202211271

[9] F. Liang, and H. Lu, The effect of grain size on aluminum anodes for Al–air batteries in alkaline electrolytes. Journal of Power Sources 284 (2015): 409-415.

DOI: 10.1016/j.jpowsour.2015.03.063

[10] J. Hwang, K. Matsumoto, R. Hagiwara, Symmetric Cell Electrochemical Impedance Spectroscopy of Na2FeP2O7 Positive Electrode Material in Ionic Liquid Electrolytes, J. Phys. Chem. C, 26857–26864, 2018.

DOI: 10.1021/acs.jpcc.8b09233