Anode engineering using a hybrid AlCl3/PTHF coating for enhanced electrochemical stability of Mg-O2 batteries
Journal
Journal of Materials Chemistry A
Journal Volume
13
Journal Issue
25
Start Page
20016
End Page
20027
ISSN
2050-7488
2050-7496
Date Issued
2025
Author(s)
Rasupillai Dharmaraj, Vasantan
Sarkar, Ayan
Wu, Yueh-An
Chen, Han-Chen
Lin, Yu-Ping
Chung, Ren-Jei
Abstract
Anode modification is vital for enhancing the performance and lifespan of Mg-O2 batteries. This study presents an AlCl3/PTHF coating process to improve the stability of magnesium anodes. The coating, which is formed by treating the Mg metal with an AlCl3 and tetrahydrofuran (THF) solution, creates a gradient hybrid layer with a PTHF-rich top for facilitating Mg-ion transport and a magnesiophilic Al-Mg mixed ionic conductive surface for uniform Mg plating and stripping. The AlCl3/PTHF-coated anode achieved remarkable stability, cycling for over 300 h in symmetric Mg-Mg cells with markedly reduced overpotential compared with bare Mg anodes. Integrated with electrospun-quasi-solid-state electrolytes (EQSSEs) and Ru/CNT cathodes in Mg-O2 cells, the modified anode demonstrated excellent compatibility, delivering stable performance for over 50 cycles under controlled discharge conditions. These findings indicate the synergistic benefits of the AlCl3/PTHF-coated Mg anode, EQSSE, and Ru/CNT cathode, paving the way for sustainable high-performance Mg-O2 battery systems.
Publisher
Royal Society of Chemistry (RSC)
Type
journal article