Multi‐Ionic Capacity of Zn‐Al/V6O13 Systems Enable Fast‐Charging and Ultra‐Stable Aqueous Aluminium‐Ion Batteries

• DOI: 10.1002/celc.202200964
• Publication Date: 2022-11-18T12:37:22Z
• Authors: Jongmin Kim; Moonsu Kim; Thangavel Selvamani; Yongsug Tak; Gibaek Lee
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

AbstractRechargeable, cost‐efficient aqueous aluminium‐ion batteries (AAIBs) possess abundant trivalent charge carriers with high volumetric energy densities. However, the rapid and irreversible formation of Al2O3 passivation films on aluminium‐ion (AI) anodes while using aqueous electrolytes limits their development. Herein, Zn metal was used as the anode, and Al3+ was locally deposited on the Zn anode during charging. V6O13 with a mixed vanadium state of V4+/V5+ was chosen as the cathode because of its efficient ion diffusion (solid state) and high electron conductivity. The Zn−Al/3 M Al(OTF)3/V6O13 cell exhibited high current density and excellent long‐term cycling stability, demonstrating a very high specific capacity of ∼100 mAh g−1 at a current density of 3 A g−1 and Coulombic efficiency of ∼100 % with reversible stability over 1400 cycles. Furthermore, the V6O13 cathode exhibited a multi‐ionic capacity of Zn2+‐ and H+‐ions during the Al deposition/dissolution reaction in AAIBs, demonstrating high safety and stability for fast charging.